Insulation and wall system

CPS uses blown glass wool within a timber frame. SIP uses a rigid PUR core with additional insulated lining in our wall build-up. If avoiding rigid foam wall insulation matters to you, start with CPS.

Compare CPS and SIP →

Heat loss and junctions

U-values describe heat passing through a building element: lower values mean less heat loss. Check the complete wall, roof, floor and window specifications for your home. Thermal bridges are local paths for heat loss at junctions and structural connections. These need careful detailing alongside the insulation.

Airtightness and fresh air

Good detailing limits unwanted air leakage. Plan ventilation and service penetrations with the project team so later work protects the airtightness details. Discuss whether mechanical ventilation with heat recovery (MVHR) suits your home.

Heating and renewable energy

Choose heating and hot-water systems around the completed home’s calculated needs. Heat pumps, solar panels and battery storage can be considered with your specialist designer or installer. Confirm their scope, cost and commissioning separately from the kit package.

Windows and glazing

Timber windows and aluminium-clad options are available, with double or triple glazing depending on the selected specification. Compare the performance of the whole window, including its frame, rather than the glass alone.

Large areas of glazing need consideration of orientation, solar gain and summer comfort. Discuss shading and glazing choices early with your designer.

External finishes

Roofing options include slate and metal; wall finishes include timber cladding and render. The choice must suit the design and site exposure, with appropriate fixings, ventilation and weathering details.

Consider how materials will age and the maintenance they need. Confirm the selected finish and who supplies and installs it in the project specification.