Working with Hertfordshire Building Control, the new home extension insulation specification guide titled 'U-value of Elements New Gold Guide' has been produced with help from a number of insulation and concrete block manufacturers. It is aimed at helping contractors and specifiers comply with Part L of the building regulations.
The guide shows in detail different solutions in a range of scenarios, such as timber frame walls, pitched and flat roofs with warm and cold decks and floors. Actis UK and Ireland technical director Thomas Wiedmer said:
WE WERE DELIGHTED TO WORK WITH HERTFORDSHIRE BUILDING CONTROL WHO WANTED TO CREATE A COMPREHENSIVE BOOKLET OFFERING THE BEST POSSIBLE ADVICE.
Charts show, for example, that one way in which to achieve the required U-value of 0.18 in a timber frame wall is to use 50 mm Actis Hybris along with insulating vapour control layer H Control Hybrid and insulating breather member Boost R Hybrid.
One solution for a vented pitched roof with a required U-value of 0.15 would be to use new Eolis HC and insulated plasterboard. An alternative would be to use a combination of Hybris and H Control Hybrid, with each solution suiting both 400 mm and 600 mm centres.
Among options suggested to achieve a U-value of 0.15 in a warm pitched roof is the use of Boost R Hybrid Roof, which contains a lap and built-in adhesive tape for ease of installation, 90 mm Hybris and H Control Hybrid. While this is the solution for 600 mm centres, the Hybris thickness would need to increase to 105 mm when working with 400 mm centres.
