Garden workshop construction

G

Gossamer

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Morning,
Just after some advice on how to construct the walls of a garden shed / workshop.
Thinking from inside to outside:

12mm ply
Studs (75x50 treated cls) and insulation inbetween studs
Tyvek breather membrane
~20mm thick battens over membrane, screwed into studs
Featheredge secured to battens (with 20mm air gap).

Is this reasonable? I was wondering whether to ply line the outside too.
 
it will probably slump so fill say the bottom 25% and an inch or so gap at the top assuming 2ft noggins
70mm kingspan /celotex or other solid foam and 89mm cls would be better
 
big-all said:
it will probably slump so fill say the bottom 25% and an inch or so gap at the top assuming 2ft noggins
70mm kingspan /celotex or other solid foam and 89mm cls would be better
Click to expand...

I did think about bigger studs but for a workshop I reckon 75x50 is ample, and it will be ply lined etc so strong enough I reckon.

I didn't understand your slumping comment tbh, why leave a gap at the top if it slumps?
 
actually scrub that rock wool is ok my brain said loft insulation lol
yes it wont slump or drop but needs a decent airspace
its not so much the strength issue its the heat retention issue
 
Last edited:
big-all said:
actually scrub that rock wool is ok my brain said loft insulation lol
yes it wont slump or drop but needs a decent airspace
its not so much the strength issue its the heat retention issue
Click to expand...

Behind it will be plywood, and in front the membrane, which I understand is breathable and waterproof. Then a ~20mm gap to the featheredge (i.e. an airgap) so it *should* get plenty of air.

Is it normal to ply line in front of the studs? I've seen some do and some don't (well most do).
 
12mm ply then you can hang what you like off it
other alternatives are 11mm osb
tyvec or other breathable membranes are pretty good use a tack hammer to save ages
 
I meant in front of the studs, i.e. ply line, membrane, batten and featheredge. I am planning on not ply lining in front - membrane, batten and featheredge
 
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