peter ranken passivhaus construction detailing
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PassivhausConstruction detailing
Peter Ranken
Accredited Passivhaus Design
The Tooley & Foster Partnership
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Detailing the Building:Construction MethodsAny construction can be used
Timber frame – various typesCross Laminated TimberMasonryInsulated concrete formworkStructural insulated panels
Issues to consider▪ Speed of erection▪ Low embodied energy▪ Off site construction ▪ Ecological construction ▪ Contractor familiarity (related to contract type)
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Detailing the Building: shapeKISS – Keep it simple – not like this pre-Passivhaus low energy development
Non-sensible Shapes:▪ Dormer windows▪ Exposed floors
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Timber frame panel• Timber frame, insulated, boarded– fast to
erect, high timber content• Insulated service zone• Thermalite block below inner leaves• Marmox structural insulation • NHBC require 150mm between internal
and external ground level (not for this project)
• Additional drainage on this site
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Timber frame panel – roof eaves• Original frame type• I section studs• Lower timber
content• External air
tightness layer –taped sheathing board
• Duplex plasterboard for vapour control
• No service zone
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Timber frame panel and brickwork
Northbrook Road, Ilford – awaiting certification 2019
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Masonry and raft foundationThin joint blockwork constructionPlaster air tightness layerTeplo wall tiesLoad bearing floor insulationRC floor slabThermal bridge freeNo load bearing insulation
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Masonry and raft foundation
Gales Place, Crawley – certified 2017
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• Where a raft foundation is not possible
• Thermal bridge to be calculcated
• Dry floor with screedboard
• Load bearing insulation -Marmox
20c internal
Max fRsi of 15 Degree. BRE/Part L
Masonry and suspended floor
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Overcoming Thermal Bridges :
▪ Continuous thermal envelope▪ Even internal surface
temperatures▪ Reduced energy use ▪ prevents surface condensation
related issues such as mould▪ fRsi in Building Regulations
stricter than Passivhaus
20c internal
0cExternal
18cAt corner
Min fRsi of 15 deg CBRE/Part L
Masonry and suspended floor
Ext U-Value-0.01 W/mK
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Dobbins Place, Crawley – Certified 2019
Masonry with suspended floor
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Masonry– roof eavesAirtightness:Wet plaster to wallsMembrane to underside of trussed rafters - replaced with airtight OSB on later projects
Thermal bridge free due to overlap of full thickness of loft insulation with wall insulation.
Service void in ceiling
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Loft hatchLocal authority client required loft access for maintenance, but not for tenant use.
Semi permanent roof hatch
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Before wet plaster goes on:
▪ Taping of window▪ Liquid airtightness to wall floor joint ▪ Liquid airtightness to first fix▪ Airtight grommets to pipes▪ Airtight sheet to ceiling
Achieved air leakage of 0.54 air changes per hour
Low air leakage - masonry
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Insulated concrete formwork & raftDeceptively simpleExternal airtightness added
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rural site
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Less radical detailing than some:• Metal clad windows for
durability • Less suitable for external
insulated frames• Detailing more conventional• Standard allowance in PHPP for
installation thermal bridge used
• Planners & clients often like brick finish
Windows
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Accredited Passivhaus Design – part of Tooley & Foster
▪ Based in Buckhurst Hill▪ Architects and Interior Designers▪ Passivhaus Designers▪ Accredited Passivhaus Design▪ ISO 9001 and 14001 certified▪ Multi Award Winning
▪ Housing▪ Care and Extra Care with dementia
specialism▪ Education▪ Health▪ Sustainable and Low Energy Design
▪ Established 1892