• Block between the joists is sand and cemented.
• Airstop Flex 75mm Tape is applied between the joist and the block. (Can be done before or after the sand and cement.Add paragraph text here.

• Block behind the joists not sand and cemented prior to hangers going in.
• Airstop Flex 100mm tape is applied from the joist, across the hanger, and to the block. This can be sand and cemented in.

Seal Joint between Timber Joist and other building component permanently airtight:

• Use Airstop Flex 75mm or wider, single sided, high-performance split-liner tape (meets (BS) EN-1206, (BS) EN1207)
• All substrates are primed using Isocell Uni Spray primer, self-adhesive, solvent-based, synthetic rubber primer
• Use A+ rated Airstop Joint Paste adhesive