Air Tightness Strategy

There are a few crowds that do a day or two day courses on airtight applications. They cover how to do taping properly and how membranes should be installed and where. I'm sure if you look up something along those lines on the internet you might find something.

I didn't do this myself, but they are supposed to be very good at making you aware of air can leak into a house and how to prevent it.

Fair play to you looking at doing it yourself. There are others on boards that would definitely say it can be done yourself, the main thing is you just need a lot of time and patience, but it can definitely be done yourself if your quite handy. I taped around my own Windows and doors and while I was very particular and aiming for perfection at every bit, it did break my heart and sole trying to peal off backing tape with little or no nails, sticky fingers, going blind squinting ha ha, brings back happy memories but I was definitely 100% chuffed and happy with myself for doing it.

Best of luck

MicktheMan wrote: »

While knowing "how to go about fitting the membrane etc" is very important, it is just as important to have a "plan" for airtightness developed before a sod is turned. Engage your air tightness tester really early on in the process to advise you on such a plan as he/she will have come up against all the weakness pitfalls which could/should have been designed out of the build at little or no extra cost.

+1, especially in a dormer which will have its own issuee.
You also need, at the design stage, to address thermal bridges, as well as whether/how the services are going to pass through the AT layer or not