2 building enclosures #2 (2014)

Building EnclosuresBuilding Enclosures

Purpose of the CoursePurpose of the Course

Is to aide in preparing you to Is to aide in preparing you to become a knowledgeable become a knowledgeable Professional Real Estate Professional Real Estate Inspector.Inspector.

OverviewOverview

R303 - Light, Ventilation and R303 - Light, Ventilation and HeatingHeating

• R303.1 - Habitable Rooms R303.1 - Habitable Rooms • R303.2 - Adjoining Rooms R303.2 - Adjoining Rooms • R303.3 - BathroomsR303.3 - Bathrooms• R303.7 - Required Glazed OpeningsR303.7 - Required Glazed Openings• R303.7.1 - Roofed PorchesR303.7.1 - Roofed Porches• R303.8 – Required HeatingR303.8 – Required Heating

R302.1/T302.1 Exterior WallR302.1/T302.1 Exterior Wall Construction, projections, openings and Construction, projections, openings and

penetrations of exterior walls of dwellings penetrations of exterior walls of dwellings and accessary buildings shall comply with and accessary buildings shall comply with ______.______.

Projections beyond the exterior wall shall Projections beyond the exterior wall shall not extend more than ____inches into not extend more than ____inches into areas where openings are prohibitedareas where openings are prohibited

Detached garages and accessary to a Detached garages and accessary to a dwelling located within ___feet of a lot line dwelling located within ___feet of a lot line are permitted to have a roof eave are permitted to have a roof eave projections not exceeding __inches.projections not exceeding __inches.

R303.1 Habitable Rooms R303.1 Habitable Rooms All habitable rooms shall be provided

with aggregate glazing area of not less than ___ percent of the floor area of such rooms. Natural ventilation shall be through windows, doors, louvers or other approved openings to the outdoor air. Such openings shall be provided with ready access or shall otherwise be readily controllable by the building occupants. The minimum openable area to the outdoors shall be ___ percent of the floor area being ventilated

ExceptionsExceptions

1. The glazed areas need not be openable where the opening is not required by Section R310 (emergency egress) and an approved mechanical ventilation system is provided capable of producing 0.35 air change per hour in the room or a whole-house mechanical ventilation system is installed capable of supplying outdoor ventilation air of 15 (cfm) per occupant computed on the basis of two occupants for the first bedroom and one occupant for each additional bedroom.

R303.2 Adjoining RoomsR303.2 Adjoining Rooms

For the purpose of determining light and ventilation requirements, any room shall be considered as a portion of an adjoining room when at least ____ of the area of the common wall is open and unobstructed and provides an opening of not less than ____ of the floor area of the interior room but not less than 25 square feet

ExceptionException

Openings required for light and/or ventilation shall be permitted to open into a thermally isolated sunroom addition or patio cover, provided that there is an openable area between the adjoining room and the sunroom addition or patio cover of not less than _____ -______ of the floor area of the interior room but not less than ____square feet. The minimum openable area to the outdoors shall be based upon the total floor area being ventilated.

R303.3 BathroomsR303.3 Bathrooms

Bathrooms, water closet compartments and other similar rooms shall be provided

with aggregate glazing area in windows of not less than ___ square feet, ___ of which must be openable

ExceptionException

The glazed areas shall not be required where artificial light and a mechanical ventilation system are provided. The minimum ventilation rates shall be __ cfm for intermittent ventilation or __ cfm for continuous ventilation. Ventilation air from the space shall be exhausted directly to the outside.

R303.7 Required Glazed R303.7 Required Glazed OpeningsOpenings

Required glazed openings shall open directly onto a street or public alley, or a yard or court located on the same lot as the building.

R303.7.1 Roofed porches

Required glazed openings may face into a roofed porch where the porch abuts a street, yard or court and the longer side of the porch is at least 65 percent open and unobstructed and the ceiling height is not less than 7 feet.

R303.8 Required HeatingR303.8 Required Heating When the winter design temperature in

Table R301.2(1) is below 60°F (16°C), every dwelling unit shall be provided with heating facilities capable of maintaining a minimum room temperature of ___°F (20°C) at a point ___ feet above the floor and ___ feet from exterior walls in all habitable rooms at the design temperature. The installation of one or more portable space heaters shall not be used to achieve compliance with this section.

OverviewOverview

R308 - GlazingR308 - Glazing

• R308.1 - Identification R308.1 - Identification • R308.1.1 – Identification of multiple R308.1.1 – Identification of multiple

assemblies assemblies • R308.2 - Louvered windows and R308.2 - Louvered windows and

jalousies jalousies • R308.2.1 – Wired glass prohibitedR308.2.1 – Wired glass prohibited• R308.3 – Human impact loadsR308.3 – Human impact loads• R308.4 – Hazardous locations R308.4 – Hazardous locations

ExceptionsExceptions

1. For other than tempered glass, labels may be omitted provided the building official approves the use of a certificate, affidavit or other evidence confirming compliance with this code.

2. Tempered spandrel glass may be identified by the manufacturer with a removable paper label.

R308.1.1 Identification of multiple R308.1.1 Identification of multiple assembliesassemblies

Multi-pane assemblies having individual panes not exceeding 1 square foot (0.09m2) in exposed area shall have at least one pane in the assembly identified in accordance with Section R308.1. All other panes in the assembly shall be labeled “16 CFR 1201.”

R308.3 Human Impact LoadsR308.3 Human Impact Loads

Individual glazed areas including glass mirrors in hazardous locations such as those indicated as defined in Section R308.4 shall pass the test requirements of CPSC 16 CFR, Part 1201. Glazing shall comply with the CPSC 16 CFR, Part 1201 criteria for Category I or Category II as indicated in Table R308.3.

R308.4 Hazardous LocationsR308.4 Hazardous Locations1) Glazing in swinging doors except jalousies.2) Glazing in fixed and sliding panels of sliding

door assemblies and panels in sliding and bifold closet door assemblies.

3) Glazing in storm doors.4) Glazing in all unframed swinging doors.5) Glazing in doors and enclosures for hot

tubs, whirlpools, saunas, steam rooms, bathtubs and showers. Glazing in any part of a building wall enclosing these compartments where the bottom exposed edge of the glazing is less than 60 inches (1524 mm) measured vertically above any standing or walking surface.

R308.4 Hazardous LocationsR308.4 Hazardous Locations

6) Glazing, in an individual fixed or operable panel adjacent to a door where the nearest vertical edge is within a 24-inch arc of the door in a closed position and whose bottom edge is less than 60 inches above the floor or walking surface.

R308.4 Hazardous LocationsR308.4 Hazardous Locations

7) Glazing, in an individual fixed or operable panel that meets all of the following conditions:

1) The pane is greater than ___ sf2) Bottom edge less than ___ in above floor3) Top edge greater than ___ in above floor4) One or more walking surfaces within ___

inches horizontally of the glazing

R308.4 Hazardous LocationsR308.4 Hazardous Locations8) All glazing in railings regardless of an area

or height above a walking surface. Included are structural baluster panels and nonstructural infill panels.

9) Glazing in walls and fences enclosing indoor and outdoor swimming pools, hot tubs and spas where the bottom edge of the glazing is less than __ inches above a walking surface and within __ inches horizontally of the water's edge. This shall apply to single glazing and all panes in multiple glazing.

R308.4 Hazardous LocationsR308.4 Hazardous Locations10) Glazing adjacent to stairways, landings

and ramps within ___ inches horizontally of a walking surface when the exposed surface of the glass is less than ___ inches above the plane of the adjacent walking surface.

11) Glazing adjacent to stairways within ___ inches horizontally of the bottom tread of a stairway in any direction when the exposed surface of the glass is less than ___ inches above the nose of the tread.

1) See exceptions under R308.4.11

R309.2 Detached GarageR309.2 Detached Garage

Interior walls of a detached garage Interior walls of a detached garage should have a min. ____in gypboard if should have a min. ____in gypboard if the wall is within __ft. of the housethe wall is within __ft. of the house

OverviewOverview R310 – Emergency Escape & Rescue R310 – Emergency Escape & Rescue

OpeningsOpenings

• R310.1 – Emergency Escape & Rescue R310.1 – Emergency Escape & Rescue Openings Openings

• R310.1.1 – Minimum opening area R310.1.1 – Minimum opening area • R310.1.2 – Minimum opening height R310.1.2 – Minimum opening height • R310.1.3 – Minimum opening widthR310.1.3 – Minimum opening width• R310.1.4 – Operational ConstraintsR310.1.4 – Operational Constraints• R310.2 – Window WellsR310.2 – Window Wells• R310.2.1 – Ladder and stepsR310.2.1 – Ladder and steps• R310.3 – Bulkhead enclosuresR310.3 – Bulkhead enclosures• R310.4 – Bars, grills, covers, and screensR310.4 – Bars, grills, covers, and screens

R310.1 – Emergency Escape & R310.1 – Emergency Escape & Rescue OpeningsRescue Openings

Basements with habitable space and every Basements with habitable space and every sleeping room shall have at least one sleeping room shall have at least one openable emergency escape and rescue openable emergency escape and rescue opening. Where basements contain one or opening. Where basements contain one or more sleeping rooms, emergency egress more sleeping rooms, emergency egress and rescue openings shall be required in and rescue openings shall be required in each sleeping room, but shall not be each sleeping room, but shall not be required in adjoining areas of the required in adjoining areas of the basement. Where emergency escape and basement. Where emergency escape and rescue openings are provided they shall rescue openings are provided they shall have a sill height of not more than 44 have a sill height of not more than 44 inches above the floor. inches above the floor.


310.1.1 Minimum opening area.310.1.1 Minimum opening area.

All emergency escape and rescue openings shall All emergency escape and rescue openings shall have a minimum clear opening of ___ sf.have a minimum clear opening of ___ sf.

Exception: Grade floor openings shall have Exception: Grade floor openings shall have a a minimum net clear opening of ___ sf.minimum net clear opening of ___ sf.

310.1.2 Minimum opening height.310.1.2 Minimum opening height.

The minimum net clear opening height shall be The minimum net clear opening height shall be ___ inches___ inches


310.1.3 Minimum opening width.310.1.3 Minimum opening width.

The minimum net clear opening width shall be ___ The minimum net clear opening width shall be ___ inches.inches.

310.1.4 Operational constraints.310.1.4 Operational constraints.

Emergency escape and rescue openings shall be Emergency escape and rescue openings shall be operational from the inside of the room without operational from the inside of the room without the use of _______ or _______.the use of _______ or _______.

R310.2R310.2 Window Wells Window Wells 310.2 Window wells.310.2 Window wells. The minimum horizontal area of the The minimum horizontal area of the

window well shall be 9 square feet, with a window well shall be 9 square feet, with a minimum horizontal projection and width minimum horizontal projection and width of 36 inches. The area of the window well of 36 inches. The area of the window well shall allow the emergency escape and shall allow the emergency escape and rescue opening to be fully opened.rescue opening to be fully opened.

Exception: The ladder or steps required by Exception: The ladder or steps required by Section R310.2.1 shall be permitted to Section R310.2.1 shall be permitted to encroach a maximum of 6 inches into the encroach a maximum of 6 inches into the required dimensions of the window well.required dimensions of the window well.

OverviewOverview R311 – Means of EgressR311 – Means of Egress • R311.1 – General R311.1 – General • R311.2 – Construction R311.2 – Construction • R311.2.1 – Attachment R311.2.1 – Attachment • R311.2.2 – Under Stair ProtectionR311.2.2 – Under Stair Protection• R311.3 – HallwaysR311.3 – Hallways• R311.4 – DoorsR311.4 – Doors• R311.4.1 – Exit Door RequiredR311.4.1 – Exit Door Required• R311.4.2 – Door Type & SizeR311.4.2 – Door Type & Size• R311.4.3 – Landings at DoorsR311.4.3 – Landings at Doors• R311.4.4 – Type of Lock or LatchR311.4.4 – Type of Lock or Latch

R311 Means of EgressR311 Means of Egress

311.1 General311.1 GeneralStairways, ramps, exterior exit balconies, Stairways, ramps, exterior exit balconies, hallways and doors shall comply with this section.hallways and doors shall comply with this section.

311.2 Construction311.2 Construction311.2.1 Attachment311.2.1 Attachment

Required exterior exit balconies, stairs and Required exterior exit balconies, stairs and similar exit facilities shall be positively similar exit facilities shall be positively

anchored to the primary structure to resist anchored to the primary structure to resist both vertical and lateral forces. Such both vertical and lateral forces. Such attachment shall not be accomplished by use attachment shall not be accomplished by use of of toenails or nails subject to withdrawal.toenails or nails subject to withdrawal.


311.2.2 Under stair protection.311.2.2 Under stair protection.Enclosed accessible space under stairs shall have Enclosed accessible space under stairs shall have walls, under stair surface and any soffits walls, under stair surface and any soffits protected on the enclosed side with _/_-inch protected on the enclosed side with _/_-inch gypsum board.gypsum board.

311.3 Hallways.311.3 Hallways.The minimum width of a hallway shall be not less The minimum width of a hallway shall be not less than ___ feet.than ___ feet.


311.4 Doors.311.4 Doors.

311.4.1 Exit door required.311.4.1 Exit door required.Not less than one exit door conforming to Not less than one exit door conforming to

this this section shall be provided for each dwelling section shall be provided for each dwelling unit. The required exit door shall provide for unit. The required exit door shall provide for direct access from the habitable portions of direct access from the habitable portions of the dwelling to the exterior without the dwelling to the exterior without

requiring requiring travel through a garage. Access to travel through a garage. Access to habitable habitable levels not having an exit in levels not having an exit in accordance with accordance with this section shall be by a ramp this section shall be by a ramp in accordance in accordance with Section R311.6 or a with Section R311.6 or a stairway in stairway in accordance with Section R311.5.accordance with Section R311.5.


311.4.2 Door type and size.311.4.2 Door type and size.The required exit door shall be a side hinged door The required exit door shall be a side hinged door not less than ___ feet in width and ___ feet ___ not less than ___ feet in width and ___ feet ___ inches in height. Other doors shall not be inches in height. Other doors shall not be required to comply with these minimum required to comply with these minimum dimensions.dimensions.

311.4.3 Landings at doors.311.4.3 Landings at doors.There shall be a floor or landing on each side of There shall be a floor or landing on each side of each exterior door.each exterior door.

R311 Means of EgressR311 Means of Egress R311.4.3 Exception: R311.4.3 Exception:

Where a stairway of two or fewer risers is located Where a stairway of two or fewer risers is located on the exterior side of a door, other than the on the exterior side of a door, other than the required exit door, a landing is not required for required exit door, a landing is not required for the exterior side of the door. The floor or landing the exterior side of the door. The floor or landing at the exit door required by Section R311.4.1 at the exit door required by Section R311.4.1 shall not be more than 1.5 inches lower than the shall not be more than 1.5 inches lower than the top of the threshold. The floor or landing at top of the threshold. The floor or landing at exterior doors other than the exit door required exterior doors other than the exit door required by Section R311.4.1 shall not be required to by Section R311.4.1 shall not be required to comply with this requirement but shall have a rise comply with this requirement but shall have a rise no greater than that permitted in Section no greater than that permitted in Section R311.5.3.R311.5.3.

R311 Means of EgressR311 Means of Egress R311.4.3 Exception: R311.4.3 Exception:

The landing at an exterior doorway shall not be The landing at an exterior doorway shall not be more than __ __/__ inches below the top of the more than __ __/__ inches below the top of the threshold, provided the door, other than an threshold, provided the door, other than an exterior storm or screen door does not swing over exterior storm or screen door does not swing over the landing.the landing.

The width of each landing shall not be less than The width of each landing shall not be less than the door served. Every landing shall have a the door served. Every landing shall have a minimum dimension of ___ inches measured in minimum dimension of ___ inches measured in the direction of travel.the direction of travel.


311.4.4 Type of lock or latch311.4.4 Type of lock or latchAll egress doors shall be readily openable from All egress doors shall be readily openable from the side from which egress is to be made without the side from which egress is to be made without the use of a ___ or special knowledge or effort.the use of a ___ or special knowledge or effort.

OverviewOverview R311.5 – StairwaysR311.5 – Stairways • R311.5.1 – Width R311.5.1 – Width • R311.5.2 – Headroom R311.5.2 – Headroom • R311.5.3 – Stair Treads & Risers R311.5.3 – Stair Treads & Risers • R311.5.3.1 – Riser HeightR311.5.3.1 – Riser Height• R311.5.3.2 – Tread DepthR311.5.3.2 – Tread Depth• R311.5.5.3 – ProfileR311.5.5.3 – Profile• R311.5.4 – Landing for StairwaysR311.5.4 – Landing for Stairways• R311.5.5 – Stairway Walking SurfaceR311.5.5 – Stairway Walking Surface• R311.5.6 – HandrailsR311.5.6 – Handrails• R311.5.6.1 – HeightR311.5.6.1 – Height

OverviewOverview R311.5 – StairwaysR311.5 – Stairways

• R311.5.6.2 – Continuity R311.5.6.2 – Continuity • R311.5.6.3 – Handrail Grip SizeR311.5.6.3 – Handrail Grip Size• R311.5.7 – Illumination R311.5.7 – Illumination • R311.5.8 – Special StairwaysR311.5.8 – Special Stairways• R311.5.8.2 – Bulkhead Enclosure R311.5.8.2 – Bulkhead Enclosure

Stairways Stairways

R311.5 StairwaysR311.5 Stairways 311.5.1 Width.311.5.1 Width.

Stairways shall not be less than ___ inches in Stairways shall not be less than ___ inches in clear width at all points above the permitted clear width at all points above the permitted handrail height and below the required headroom handrail height and below the required headroom height. Handrails shall not project more than ____ height. Handrails shall not project more than ____ inches on either side of the stairway and the inches on either side of the stairway and the minimum clear width of the stairway at and below minimum clear width of the stairway at and below the handrail height, including treads and the handrail height, including treads and landings, shall not be less than ____ inches where landings, shall not be less than ____ inches where a handrail is installed on one side and ___ inches a handrail is installed on one side and ___ inches where handrails are provided on both sides.where handrails are provided on both sides.

R311.5 StairwaysR311.5 Stairways Exception: Exception:

The width of spiral stairways shall be in The width of spiral stairways shall be in accordance with Section R311.5.8.accordance with Section R311.5.8.

311.5.2 Headroom.311.5.2 Headroom.The minimum headroom in all parts of the The minimum headroom in all parts of the stairway shall not be less than ___ feet ___ inches stairway shall not be less than ___ feet ___ inches measured vertically from the sloped plane measured vertically from the sloped plane adjoining the tread nosing or from the floor adjoining the tread nosing or from the floor surface of the landing or platform.surface of the landing or platform.

R311.5 StairwaysR311.5 Stairways

311.5.3 Stair treads and risers.311.5.3 Stair treads and risers.

311.5.3.1 Riser height.311.5.3.1 Riser height.The maximum riser height shall be __ __/__ The maximum riser height shall be __ __/__ inches. The riser shall be measured inches. The riser shall be measured

vertically between leading edges of the vertically between leading edges of the adjacent treads. The greatest riser height adjacent treads. The greatest riser height within any flight of stairs shall not exceed the within any flight of stairs shall not exceed the smallest by more than __/__ inch.smallest by more than __/__ inch.


311.5.3.2 Tread depth.311.5.3.2 Tread depth.

The minimum tread depth shall be ___ inches. The The minimum tread depth shall be ___ inches. The tread depth shall be measured horizontally tread depth shall be measured horizontally between the vertical planes of the foremost between the vertical planes of the foremost projection of adjacent treads and at a right angle projection of adjacent treads and at a right angle to the tread's leading edge. The greatest tread to the tread's leading edge. The greatest tread depth within any flight of stairs shall not exceed depth within any flight of stairs shall not exceed the smallest by more than __/__ inch. the smallest by more than __/__ inch.


311.5.3.2 Tread depth, con’t.311.5.3.2 Tread depth, con’t.

Winder treads shall have a minimum tread depth Winder treads shall have a minimum tread depth of ___ inches measured as above at a point ___ of ___ inches measured as above at a point ___ inches from the side where the treads are inches from the side where the treads are narrower. narrower.

Winder treads shall have a minimum tread depth Winder treads shall have a minimum tread depth of ___ inches at any point. Within any flight of of ___ inches at any point. Within any flight of stairs, the greatest winder tread depth at the ___ stairs, the greatest winder tread depth at the ___ inch walk line shall not exceed the smallest by inch walk line shall not exceed the smallest by more than __/__ inch.more than __/__ inch.

R311.5 StairwaysR311.5 Stairways 11.5.3.3 Profile.11.5.3.3 Profile.

The radius of curvature at the leading edge of the The radius of curvature at the leading edge of the tread shall be no greater than __/__ inch. A nosing tread shall be no greater than __/__ inch. A nosing not less than __/__ inch but not more than __ __/__ not less than __/__ inch but not more than __ __/__ inch shall be provided on stairways with solid inch shall be provided on stairways with solid risers. risers.

The greatest nosing projection shall not exceed The greatest nosing projection shall not exceed the smallest nosing projection by more than __/__ the smallest nosing projection by more than __/__ inch between two stories, including the nosing at inch between two stories, including the nosing at the level of floors and landings. Beveling of the level of floors and landings. Beveling of nosing shall not exceed __/__ inch. nosing shall not exceed __/__ inch.

R311.5 StairwaysR311.5 Stairways 11.5.3.3 Profile con’t.11.5.3.3 Profile con’t.

Risers shall be vertical or sloped from the Risers shall be vertical or sloped from the underside of the leading edge of the tread above underside of the leading edge of the tread above at an angle not more than 30 degrees from the at an angle not more than 30 degrees from the vertical. Open risers are permitted, provided that vertical. Open risers are permitted, provided that the opening between treads does not permit the the opening between treads does not permit the passage of a ___-inch diameter sphere.passage of a ___-inch diameter sphere.

Exceptions:Exceptions:1. A nosing is not required where the tread depth 1. A nosing is not required where the tread depth is a minimum of ___ inches.is a minimum of ___ inches.2. The opening between adjacent treads is not 2. The opening between adjacent treads is not limited on stairs with a total rise of 30 inches limited on stairs with a total rise of 30 inches or or less.less.

R311.5 StairwaysR311.5 Stairways 311.5.4 Landings for stairways.311.5.4 Landings for stairways.

There shall be a floor or landing at the top and There shall be a floor or landing at the top and bottom of each stairway.bottom of each stairway.

Exception: Exception: A floor or landing is not required at the top of an A floor or landing is not required at the top of an interior flight of stairs, provided a door does not interior flight of stairs, provided a door does not swing over the stairs.swing over the stairs.

A flight of stairs shall not have a vertical rise A flight of stairs shall not have a vertical rise greater than ____ feet between floor levels or greater than ____ feet between floor levels or landings.landings.

R311.5 StairwaysR311.5 Stairways 311.5.4 Landings for stairways.311.5.4 Landings for stairways.

The width of each landing shall not be less than The width of each landing shall not be less than the stairway served. Every landing shall have a the stairway served. Every landing shall have a minimum dimension of ___ inches measured in minimum dimension of ___ inches measured in the direction of travel.the direction of travel.

311.5.5 Stairway walking surface.311.5.5 Stairway walking surface.

The walking surface of treads and landings of The walking surface of treads and landings of stairways shall be sloped no steeper than one stairways shall be sloped no steeper than one unit vertical in 48 inches horizontal (2-percent unit vertical in 48 inches horizontal (2-percent slope)slope)

R311.5 StairwaysR311.5 Stairways 311.5.6 Handrails311.5.6 Handrails

Handrails shall be provided on at least one side of Handrails shall be provided on at least one side of each continuous run of treads or flight with four each continuous run of treads or flight with four or more risers.or more risers.

311.5.6.1 Height311.5.6.1 Height

Handrail height, measured vertically from the Handrail height, measured vertically from the sloped plane adjoining the tread nosing, or finish sloped plane adjoining the tread nosing, or finish surface of ramp slope, shall be not less than ___ surface of ramp slope, shall be not less than ___ inches and not more than ___ inches.inches and not more than ___ inches.


311.5.6.2 Continuity311.5.6.2 Continuity

Handrails for stairways shall be continuous for the Handrails for stairways shall be continuous for the full length of the flight, from a point directly full length of the flight, from a point directly above the top riser of the flight to a point directly above the top riser of the flight to a point directly above lowest riser of the flight. Handrail ends above lowest riser of the flight. Handrail ends shall be returned or shall terminate in newel shall be returned or shall terminate in newel posts or safety terminals. Handrails adjacent to a posts or safety terminals. Handrails adjacent to a wall shall have a space of not less than __ __/__ wall shall have a space of not less than __ __/__ inch between the wall and the handrails.inch between the wall and the handrails.

R311.5 StairwaysR311.5 Stairways 311.5.6.2 Continuity con’t311.5.6.2 Continuity con’t

Exceptions:Exceptions:

1. Handrails shall be permitted to be interrupted 1. Handrails shall be permitted to be interrupted by a newel post at the turn.by a newel post at the turn.

2. The use of a volute, turnout, starting easing or 2. The use of a volute, turnout, starting easing or starting newel shall be allowed over the starting newel shall be allowed over the

lowest tread.lowest tread.

311.5.6.3 Handrail grip size311.5.6.3 Handrail grip size

All required handrails shall be of one of the All required handrails shall be of one of the

following types or provide equivalent graspabilityfollowing types or provide equivalent graspability..

R311.5 StairwaysR311.5 Stairways 311.5.6.3 Handrail grip size con’t311.5.6.3 Handrail grip size con’t

1. Type I. 1. Type I.

Handrails with a circular cross section shall Handrails with a circular cross section shall have an outside diameter of at least __ __/__ have an outside diameter of at least __ __/__ inches and not greater than __ inches. inches and not greater than __ inches.

R311.5 StairwaysR311.5 Stairways 311.5.6.3 Handrail grip size con’t311.5.6.3 Handrail grip size con’t

2. Type II 2. Type II

The minimum width of the handrail above the The minimum width of the handrail above the recess shall be _____ inches to a maximum of _____ recess shall be _____ inches to a maximum of _____ inches. inches.


311.5.7 Illumination311.5.7 Illumination

All stairs shall be provided with illumination in All stairs shall be provided with illumination in accordance with Section R303.6accordance with Section R303.6

311.5.8 Special stairways311.5.8 Special stairways

Circular stairways, spiral stairways, winders and Circular stairways, spiral stairways, winders and bulkhead enclosure stairways shall comply with bulkhead enclosure stairways shall comply with all requirements of Section R311.5 except as all requirements of Section R311.5 except as specified below.specified below.


311.5.8.1 Spiral stairways311.5.8.1 Spiral stairways

Spiral stairways are permitted, provided the Spiral stairways are permitted, provided the minimum width shall be ___ inches with each minimum width shall be ___ inches with each tread having a __ __/__-inches minimum tread tread having a __ __/__-inches minimum tread depth at ___ inches from the narrower edge. All depth at ___ inches from the narrower edge. All treads shall be identical, and the rise shall be no treads shall be identical, and the rise shall be no more than __ __/__ inches. A minimum headroom more than __ __/__ inches. A minimum headroom of ___ feet ___ inches shall be provided.of ___ feet ___ inches shall be provided.

R311.5 StairwaysR311.5 Stairways 311.5.8.2 Bulkhead enclosure stairways311.5.8.2 Bulkhead enclosure stairways

Stairways serving bulkhead enclosures, not part Stairways serving bulkhead enclosures, not part of the required building egress, providing access of the required building egress, providing access from the outside grade level to the basement from the outside grade level to the basement shall be exempt from the requirements of shall be exempt from the requirements of Sections R311.4.3 and R311.5 where the Sections R311.4.3 and R311.5 where the maximum height from the basement finished maximum height from the basement finished floor level to grade adjacent to the stairway does floor level to grade adjacent to the stairway does not exceed 8 feet, and the grade level opening to not exceed 8 feet, and the grade level opening to the stairway is covered by a bulkhead enclosure the stairway is covered by a bulkhead enclosure with hinged doors or other approved means.with hinged doors or other approved means.

OverviewOverview R312 – GuardsR312 – Guards

• R312.1 – Required R312.1 – Required • R312.2 – Guard opening LimitationsR312.2 – Guard opening Limitations

R311.5 StairwaysR311.5 Stairways 312.1 Guards required.312.1 Guards required.

Porches, balconies or raised floor surfaces located Porches, balconies or raised floor surfaces located more than ___ inches above the floor or grade more than ___ inches above the floor or grade below shall have guards not less than ___ inches below shall have guards not less than ___ inches in height. Open sides of stairs with a total rise of in height. Open sides of stairs with a total rise of more than ___ inches above the floor or grade more than ___ inches above the floor or grade below shall have guards not less than ___ inches below shall have guards not less than ___ inches in height measured vertically from the nosing of in height measured vertically from the nosing of the treads.the treads.

Porches and decks which are enclosed with insect Porches and decks which are enclosed with insect screening shall be provided with guards where screening shall be provided with guards where the walking surface is located more than ___ the walking surface is located more than ___ inches above the floor or grade below.inches above the floor or grade below.

R312 GuardsR312 Guards 312.2 Guard opening limitations.312.2 Guard opening limitations.

Required guards on open sides of stairways, Required guards on open sides of stairways, raised floor areas, balconies and porches shall raised floor areas, balconies and porches shall have intermediate rails or ornamental closures have intermediate rails or ornamental closures which do not allow passage of a sphere ___ inches which do not allow passage of a sphere ___ inches or more in diameter. or more in diameter.

Exceptions:Exceptions:

1. The triangular openings formed by the riser, tread 1. The triangular openings formed by the riser, tread and bottom rail of a guard at the open side of a and bottom rail of a guard at the open side of a stairway are permitted to be of such a size that a stairway are permitted to be of such a size that a sphere ___ inches cannot pass through.sphere ___ inches cannot pass through.

2. Openings for required guards on the sides of stair 2. Openings for required guards on the sides of stair treads shall not allow a sphere __ __/__ inches to treads shall not allow a sphere __ __/__ inches to pass through.pass through.

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R613.2 Window SillsR613.2 Window Sills

In dwelling units, where the openings In dwelling units, where the openings of of an operable window is located more than an operable window is located more than ___inches above the finished grade or surface ___inches above the finished grade or surface below, the lowest part of the clear opening of below, the lowest part of the clear opening of the window shall be a minimum of ____inches the window shall be a minimum of ____inches above the finished floor of the room in which above the finished floor of the room in which the window is located. Glazing between the the window is located. Glazing between the floor and ___inches shall be fixed or have floor and ___inches shall be fixed or have openings through which a __inch diameter openings through which a __inch diameter sphere cannot pass.sphere cannot pass.

2 building enclosures #2 (2014)

Documents

adjoining rooms r303

ventilation requirements

intermittent ventilation

continuous ventilation

natural ventilation

habitable rooms r303

outdoor ventilation

minimum openable area