Rear Ventilated Rain Screen Superior Wall System for Brilliant Buildings

- July 21, 2015 page 1

Define RVRS •  Cladding stands off the moisture resistant surface

to create a drainage plane and ventilation cavity. •  Vertical cavity for stack effect. •  The wall is open top and bottom to allow ventilation, •  Intermediate gaps can be open or closed; aesthetic

decision. •  The Rear Ventilated Rain Screen can be built over an

insulated wall system, or simply over structure. (see discussion on designing thermally broken insulated RVRS systems)

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Key Attributes of RVRS Facades?

•  Remove water and vapour in active, natural manner from assembly •  Exterior takes abuse of the weather - full heat, the sun, the wind… •  Ventilation helps the building AND the façade product •  Accommodates any amount of insulation •  Insulation is always drying - better effective R •  Simpler, more easily built and inspected - no caulking •  Lighter thinner systems than concrete and brick •  Unlimited choice in panel selection. •  Better energy efficiency than most curtain wall •  Less expensive than many other systems

History and Standards

•  Ventilated façade early adopted in Europe, a skin to shield the building from the elements

•  DIN 18516 – German Construction Standard –  Specifies all key attributes –  Spacing behind panel minimum 20mm

•  Materials developed to leverage ventilation –  High density fibre cement –  Phenolic –  Ceramic –  Porcelain –  Metals

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RVRS suitable for all building types

House Condo Hotel University School Hospital

Panels

page 7

Zinc

ACP FRC & GFRC

Phenolic

Porcelain Ceramic

ACP

Stone veneer

Unlimited choice

Rear Ventilated Rain Screen (Moisture Management)

Drainage and ventilation

Some water gets in, and then

drains out. Condensation

and water vapour vented to

exterior.

Alternatively – Single Skin Construction. Water always gets in causing deterioration

Crack

Drained cavity Rainscreen eg Masonry

•  Masonry uses Rainscreen term – different than RVRS

•  Drainage of water that penetrates the brick is allowed to drain out

•  Limited to no ventilation; closed top and bottom of wall.

•  Less active plenum; reducing benefit of ventilation

•  Constructability issues with ensuring drainage is working

•  Heavier, more steps to build

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RVRS (Insulation)

NATURAL INSULATION – 0.5 R Value from RVRS Energy Efficiency Consumption of AC/Heating Acoustic Insulation

RVRS (Temperature Regulation)

When the outside temperature is HOT, the ventilated rain screen cladding has a cooling effect on the building

•  Most of the sun’s rays are reflected •  Ventilating effect of the air gap

RVRS (Temperature Regulation)

When the temperature is COLD outside the same process occurs: •  Most of the cold air is

reflected by the exterior architectural panel •  The remaining cool air will

partially dissipate by the ventilating effect of the air gap between the architectural panel and the structural wall

•  Insulation is protected, so will remain effective

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Detail in practice

EA Design Guide – all conditions

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Key Attributes of RVRS Facades?

•  Remove water and vapour in active, natural manner from assembly •  Exterior takes abuse of the weather - full heat, the sun, the wind… •  Ventilation helps the building AND the façade product •  Accommodates any amount of insulation •  Insulation is always drying - better effective R •  Simpler, more easily built and inspected - no caulking •  Lighter thinner systems than concrete and brick •  Unlimited choice in panel selection. •  Better energy efficiency than most curtain wall •  Less expensive than many other systems