External cavity wall – Cold timber frame/Brick

The flexible long edge of the slab allows for the 600 mm wide product to be flexed into the 590 mm space between metal studs or into the 562mm space between 38 mm wide timber studs.

Where studs are spaced at 400 mm centres, 1200 mm x 400 mm wide Rockwool Flexi should be used.

The breather membrane is fixed to the OSB sheathing board and extended below the lowest timber member (sole plate).

Rockwool Flexi is fitted between timber stud frames. A vapour control layer is applied to the studs across the inner face of the wall before fixing the plasterboard. The vapour control layer should be fixed according to manufactures instructions. If a plasterboard with a vapour check is used, a vapour control layer may not be required. It is important that the vertical joint in the plasterboard lining should coincide with the centre line of the timber stud.

Cavity barriers and fire stops should be installed as required to meet the Building Regulations. Please see our Rockwool TCB cavity barrier .

After erecting the timber frame, the brickwork is build and should be tied back to the main stud framing using standard timber frame wall ties.

A clear 50 mm (min) residual cavity is required between two timber frame sheathing board & center masonry wall.