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There are a lot of messages on here saying a lot of things! It might be basic to you with your years of shed building but its new to me so stop being condesending. So should i raise the osb with 25mm battens or not? I notice there was no membrane on your shed diagram

What is wrong with breather location? On a traditional roof breather goes on rafters then battens then tiles. Except in this case its osb instead of tiles? The osb will be covered in felt which i will wrap around the fascia

It will be osb inside, pir insulation enough to leave 50mm void then breather and osb

So should i raise this OSB roof up with some battons then?

I am just doing the one osb skin inside now. I didnt have a larger overhang as the wood was 2.4m so i just went with that to save time and money

Ah good point!

:lol: :lol: :lol:

Its fine i knew the answer as soon as i finshed building it lol, ill just raise the osb with some battons i guess

I guess your going to say that breather membrane is pointless due to it being not able to breath and butted up to osb and i should of raised osb roof? If anything though it serves to stops water if somehow it gets through roof

i do notice there is still some wobble with the frame, will this be rectified once the inner osb is installed which will offer more stability and strength or will i require some diagonal braces of some sort?

You mean reinforced double header etc above where the door will be? Yea i have not built that yet, last bit of framing to do

I am indeed a very nice chap and i don't appreciate sarcastic remarks thrown at me.

I understand the differences i was just wondering about behind the membrane and whether that could be solid, but as Mike stated i guess it cant and it needs a void to breathe and lose fill insulation wouldnt really affect that.

Thank you for the informative post, the 80% rule is interesting i will research that further, regarding your other points i would have put the breather membrane over the osb not under, does breather membrane also require clearance behind? I guess not due to it normally backing onto insulation

Thanks for your reply, i find you to be the most plesant of people on here, your posts are informative and you give reason without the need to belittle or insult. People ask questions thats how they learn and most people on here seem to get highly offended by it and throw their dummys out the...

Then tell me how what i am suggesting will majorly affect your standard shed build

I have actually learnt a lot thanks, i just ask a lot of questions. The internet is full of companies and individuals building sheds and workshops and many of them are double skinned, now you guys on here say they are all wrong which is fine if thats the case but dont expect me to just take your...

No i don't because im God and I know everything :roll: ..... What a ridiculous thing to say, i say im a security engineer yet you then think i should be a specialist in physics and moisture and try to belittle me like im an silly person which i then disprove and now you say i dont need help with the...

What cock up is that? Following the same design that you specify but adding some external boarding that still leaves a gap in each frame section top and bottom, so basically changing nothing but providing extra security and strength. What is the downside to that idea? I would love to hear it...