Lethame House, a new luxury housing project by Apex Developments in Strathaven, near Glasgow, is using three DuPont building membranes to help it exceed the thermal and airtightness standards set by the regulations

The timber-frame, stone-clad buildings use DuPont AirGuard’s air-leakage barrier on the internal walls. This is a metallised vapour control layer that is impermeable to both air and moisture and offers very low emissivity so plays a key role in preventing heat loss, reflecting up to 90% of internal radiant heat in the winter, claims the company.

DuPont Tyvek Reflex metallised breather membrane is used on the external walls and DuPont Tyvek Supro breather membrane on the roof. DuPont Tyvek is a single layer construction that is wind and water-tight owing to its composition of millions of micro fibres bonded together to make a “maze” that, says the company, is impermeable to moisture but allows water vapour to pass through. It can also be metallised to create highly-reflective surfaces with low-emissivity.