Roger Bisby Seals the Deal with BlowerProof

Roger Bisby Seals the Deal with BlowerProof

It is a funny thing about this product. The company sent me a sample and it disappeared, then they sent another tub and that also went astray. Third time lucky, but I wonder if the person who liberated those first two tubs knows what to do with it, because it isn’t immediately obvious. I mean, what does the name BlowerProof suggest to you?

It is all to do with airtightness, and stopping all those air leakage points. As I am writing this we have just bid farewell to the Beast from the East, and if there were gaps to find in a building that ice cold wind found them. You certainly didn’t need any fancy instruments to tell you where the air leakage points were.

In more benign weather you would need help, and these days the airtightness is tested with a blower. Actually, the point at which this happens on a build may be a little late to take remedial action, so the best thing is to use prevention rather than cure. BlowerProof is a liquid membrane that can be plastered or rendered over when it is dry.

Typical uses are anywhere that the internal leaf is breached. This could be built in joist ends, cable entry or exit points and around any pipes. It could also be along the DPC or any lintels where mortar shrinkage leaves hairline cracks.

BlowerProof is easy to apply with a brush, but you can also buy a spray-on version for hard to reach areas. Remember it doesn’t have to look pretty because it will be covered. If you are dry lining there is a case to be made for painting the internal blockwork to prevent any air leakage on the mortar joints. This is often done with parging, but BlowerProof is quicker and maybe even cheaper.

If you want to seal around frames there is also a tube which fit your mastic gun. All the products in the range start out blue and dry black, but you can also get a version that dries white.


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