Walls

Walls

Typically wall, roof and floor elements in Passivhaus buildings should aspire to: a U-value of between 0.10 W/m2K to 0.15 W/m2K, whatever the construction method employed; minimal thermal bridging; and ideally an internal service void so that services do not penetrate the airtight/vapour barrier. The thickness of the wall construction needed to achieve the required thermal performance will vary greatly, possibly from 300mm to 500mm, depending on the chosen insulation and construction type used. This section looks at the advantages and disadvantages of typical UK wall construction techniques.

Structural Insulated Panels (SIPS) are an off-site, easy to build wall system commonly made up of insulation sandwiched between 15mm board. This should preferably be installed externally to minimise the thermal bridging of solid timber sole and...

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This in theory is the easiest method to attain the Passivhaus goals for walling, and can be achieved with a wide choice of rigid and semi rigid insulation materials. The structure, usually of concrete or blockwork, is inside the thermal envelope...

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Cavity wall is still probably the most common form of construction in the UK, so should not concern to most builders, but the approach needs to be adopted to achieve the more rigorous Passivhaus requirements. For masonry cavity wall to meet...

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This section looks at the types of materials used with timber frame construction, to make up the rest of the walls.

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Timber frame

Can be site fabricated (known as ‘stick construction’) or prefabricated in a factory situation delivered to site in panels.

Timber stud

The most common timber framing system would typically use 144/...

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The Greenhauses

The Greenhauses offer an example of affordable Passivhaus level construction in a tight urban setting. The development includes a row of three-storey terraces (Block A) and two five-storey apartment buildings (Blocks B & C). Both Blocks A and B are Passivhaus certified.

The...

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Ancon Building Products
Teplo Cavity Wall Ties

Summary:

Ancon Teplo Low Thermal Conductivity Wall Ties suit cavities up to 450mm and minimise heat loss through thermal bridging, improving the energy efficiency of a masonry cavity wall. Ideal for today’s...

Product certification:
BBA Certificate No. 14/5160
Featured project:
Steel Farm
Green Building Store
Compacfoam Compacfoam 200

Specialist rigid thermoplastic insulation used for thermal bridging detailing, including at window & door thresholds.

• Strong lightweight rigid insulation made from thermoplastic foam, based on polystyrene.

...
Product certification:
N/A
Featured project:
Homes for Exeter City Council

Comprise a 142 or 172 mm thick structural insulated panel (SIP). Panels are connected with a unique jointing system.

Product certification:
N/A
Featured project:
N/A
Kingspan
Kooltherm K5 External Wall Board

Kingspan Kooltherm K5 External Wall Board is a premium performance insulation, with a fibre-free rigid thermoset phenolic core, which is used for external insulation on masonry walls behind traditional and lightweight polymer modified renders...

Product certification:
N/A
Featured project:
N/A

Comprises 142 or 172 mm thick structural insulated panels (SIPs) connected with a unique jointing system for walls and roofs, and intermediate floors using I-beams or open web joists.

Product certification:
N/A
Featured project:
The Greenhauses, London
Kingspan
Kooltherm K118 Insulated Plasterboard

Kingspan Kooltherm K118 Insulated Plasterboard is a premium performance, lower lambda internal wall insulation, with a fibre-free rigid thermoset phenolic core. It has a 12.5mm plasterboard bonded to its front surface and a composite foil...

Product certification:
N/A
Featured project:
N/A