YodhrinForge Posted February 3 Posted February 3 Part of the project I'll be doing at my new house is upgrading the existing loft conversion, part of which will require tying the airtight layer upstairs into the wall parge downstairs and also aiming for low vapour permeability(as opposed to downstairs, where I'll be going fully vapour open with lime/clay - pending computer modelling of dew points etc - due to the stone walls) since sadly I'm limited by the conservation area to staying with room-in-roof as I can't alter the roof's external size or shape to make a warm roof. I've seen a few youtubers using, internally, an OSB product with a green coating that ostensibly allows it to be air tight and very vapour resistant(once properly taped) that seems like it would be way faster and more convenient, especially as a DIYer, than wrestling with membranes and battens but all the applications I've seen it used in are walls - has anyone used it in roofs, and if so what did you think? I know that in principle a timber roof is just a timber wall on a slant so it should be fine to use, but some firsthand knowledge would be welcome.
Russell griffiths Posted February 3 Posted February 3 Price it up, then look at making your own with a couple of good coats of paint onto standard osb.
YodhrinForge Posted February 3 Author Posted February 3 1 hour ago, Russell griffiths said: Price it up, then look at making your own with a couple of good coats of paint onto standard osb. Pretty sure there's more to passivehouse-approved products with proprietary coatings than just slapping a coat of paint on it.
Russell griffiths Posted February 3 Posted February 3 16 minutes ago, YodhrinForge said: Pretty sure there's more to passivehouse-approved products with proprietary coatings than just slapping a coat of paint on it. Have you used it. It’s basically osb with a very shiny coating, give it a coat of passive purple if you really want to, but as far as I’m aware it’s just a non permeable board. Its not like the intelligent membranes that let some stuff through and not others. as long as we’re talking about the shiny green stuff.
Alan Ambrose Posted February 3 Posted February 3 >>> intelligent membranes Whenever that term's mentioned, I always imagine little busy-bee vapour control bugs looking puzzled and scratching their heads...
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