OK, the start of my winter project. I'm building a playhouse for my 2yo & 4yo, which will be an 2.5mx2.5m shed with a raised platform inside.
I know, starting an outdoor project in winter makes no sense but this has to be completed by March - i hope to get it closed in within a fortnight of starting, then i can take my time on the interior, which i aim to plaster, skirting, fitted cupboards, carpet upstairs, laminate downstairs, etc, etc - i'm a very slow worker!
My first question though is about the wall construction, i've googled loads and got lots of conflicting advice. But here is what I have settled on for now, working outside in....
1. 18mm pressure treated shiplap
2. pressure treated battons (size?)
3. breathable membrane (Tyvek?)
4. 18mm WBP PLY or OSB?
5. Timber frame (2x4) on 400mm centres - gaps packed with rockwool
6. breathable membrane (Tyvek again?)
7. plasterboard
Does this seem right to those in the know? The most conflicting advise i've seen is with regards to the placement of the breathable membrane. With the two arguments being:
1. It has to go behind the plasterboard (6) to stop warm moist air reaching the cold side of the insulation and then condensing there and soaking the insulation.
2. It has to go on top of the OSB (3) to protect the OSB from any water that penetrates the shiplap.
I've not yet decided on OSB or WBP WPLY as i've not priced up either, but I suspect that price might push me towards OSB, in which case i'd feel happier with the membrane on top of it (then again, i've not priced up the difference between OSB+Membrane vs PLY either!).
Would having both layers of membrane cause any issues?
Can anyone else offer any advice? I want this to be a sturdy, weatherproof construction that I can remove the platform from in the future when the kids get bigger and still be used as an outdoor playroom till the kids are in thier teens - at which point it'll become my quiet room where i can go and relax in peace with a good book!
I know, starting an outdoor project in winter makes no sense but this has to be completed by March - i hope to get it closed in within a fortnight of starting, then i can take my time on the interior, which i aim to plaster, skirting, fitted cupboards, carpet upstairs, laminate downstairs, etc, etc - i'm a very slow worker!
My first question though is about the wall construction, i've googled loads and got lots of conflicting advice. But here is what I have settled on for now, working outside in....
1. 18mm pressure treated shiplap
2. pressure treated battons (size?)
3. breathable membrane (Tyvek?)
4. 18mm WBP PLY or OSB?
5. Timber frame (2x4) on 400mm centres - gaps packed with rockwool
6. breathable membrane (Tyvek again?)
7. plasterboard
Does this seem right to those in the know? The most conflicting advise i've seen is with regards to the placement of the breathable membrane. With the two arguments being:
1. It has to go behind the plasterboard (6) to stop warm moist air reaching the cold side of the insulation and then condensing there and soaking the insulation.
2. It has to go on top of the OSB (3) to protect the OSB from any water that penetrates the shiplap.
I've not yet decided on OSB or WBP WPLY as i've not priced up either, but I suspect that price might push me towards OSB, in which case i'd feel happier with the membrane on top of it (then again, i've not priced up the difference between OSB+Membrane vs PLY either!).
Would having both layers of membrane cause any issues?
Can anyone else offer any advice? I want this to be a sturdy, weatherproof construction that I can remove the platform from in the future when the kids get bigger and still be used as an outdoor playroom till the kids are in thier teens - at which point it'll become my quiet room where i can go and relax in peace with a good book!