Penetrations are the number 1 damage potential Ampacoll BK 535 has been specially designed for the permanent and simple sealing of all penetrations such as rafters, beams, outlet vents, electric pipes, etc. in the case of wind seals, roof membranes, vapour retardants and vapour seals. The butyl rubber band is flexible enough to move with any subsequent movements in the building component.
The surface for adhesive strips and sometimes also for adhesives must be clean, dry and grease and dust free. Connections to porous, damp or dusty surfaces must be pre-treated with a primer which will make them receptive to the adhesive. In cases of doubt always use a primer or undertake your own adhesion tests.