The depth of the timber battens and metal furrings should comply with BS 8212 : 1995. The depth of the timber battens or metal furrings will determine the air space achieved on either side of the product.

Eg.1 Battens tanalised in accordance with BS 5268-5: 1989 (1997) are fixed either vertically or horizontally at 400mm. Battens must always be placed at the top and bottom of the wall and around the perimeter of doors and windows. The product is applied directly from the roll either vertically or horizontally depending on the wall height, pulled tight and stapled onto the battens at minimum 300mm centres. The foil side of material should face the cavity. The product to be butt-jointed onto the battens and sealed using the recommended foil faced to tape, this then enables the product to become a vapour barrier. The plasterboard is fixed over the product and onto the battens in the usual manor.

Eg.2 Alternatively the product (foil face facing the cavity) can be retained directly against the wall by the battens at minimum 300mm centres. The plasterboard is placed on top of the battens. Following the above procedure as described above it is possible to fix counter battens in the usual manner. The foil sides of the material will be facing the cavities formed by the use of the battens.