Application: Masonry/Brick Cavity Wall Insulation - Installation Guide
The walls are constructed leading with either inner or outer leaf with the insulation fixed to the cavity face of the leading leaf. It is recommended that the inner leaf be constructed ahead of the outer leaf, in that boards are fastened to the cavity face of the inner leaf. This gives a slightly enhanced thermal performance.
A section of the leading leaf is built with the first row of wall ties, at approximately 600mm horizontal spacing, where the insulation is to begin. The first run of boards may commence below damp-proof course level to provide some edge insulation for the floor (see figure 1)
The Leading leaf is built up to a height of 450mm. excess mortar is cleaned from the cavity face of the leading leaf, and the boards are placed on the wall ties behind retaining clips, to form a closely butt-jointed run. The second row of the wall ties is fitted to retain the tops of the board. It is essential that all wall ties slope downwards towards the outer leaf (see Figure 2). Horizontal spacing should be determined as follows
Where insulation retaining ties/clips are sufficient for structural purposes, horizontal spacing should be 450mm or 600mm, depending on the thickness of the inner leaf.
Where additional vertical twist ties are required, insulation retaining ties/clips should be spaced at 600mm horizontal centre to give adequate retention of the slabs while additional ties can be used as required.
The outer leaf is built up to the level of the top of the boards
Recommended Material: FM 250, 25-40mm (To meet desired R-values)
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