Installation of U-Foil, 2BD/A & 1BD/A
It is generally recommended that the inner leaf is to be constructed ahead of the outer leaf as this will ensure the laps are weathered to the outside. When constructing the cavity the leading leaf should be constructed to a height of approximately 1.2metre or 4 / 5 blocks above dpc level. The
secondary leaf is built up to the top-most line of wall ties. Once the leading leaf has attained adequate strength, the initial run of 2BD/A or 1BD/A is positioned over the wall ties which should be installed in accordance with BS5628-3: 1985, the wall ties assessed in accordance with DD 140-1: 1986. The next run to be installed ensuring a minimum overlap of 75mm, this to be repeated at all horizontal joints. All vertical joints in the product should always be on line of the wall ties, ensuring a 100mm overlap i.e., 50mm either side of the wall tie, all vertical joints are to be tapped using are special foil tape. The tape should be between 30 and 40 microns. When arriving at door and window openings our U-Foil products can be brought through the closed reveal to act as an insulating dpc.

Installation of U-Foil 1BD/A-1
1BD/A-1 to be installed in the same manor as 2BD/A and 1BD/A but secured up against the inner block with the foil facing the cavity, 1BD/A-1 wall ties are manufactured and assessed in accordance with BS 1243 :1978.