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DPM- Vapour barrier ?

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pswallace

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Hi folks, I am currently building A wooden structure workshop. Because of budget restrictions I wont be insulating it for 4-5 months .The roofing materiel is P.V.C coated corrugated steel sheeting which has been sprayed with A substance that prevents condensation build up.The walls are 2x4 studding finished with treated ship-lap. What I can't decide is should I be sheeting the walls with and roof with DPM before fixing the ship-lap and roof sheets or should I be using DPM on the walls and vapour barrier on the roof? I don't want it to feel like A green house in the summer and I would also like any condensation to be able to escape.I will be insulating and sheeting the inside in the near future but I don't know if this has any bearing at all. . . .Has anyone any advice? Phil.
 

Hudson Carpentry

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DPM is for stopping moisture rising so is lay'ed under concrete floors & under walls. Basically where moisture could rise and damage the building. You use VPs & BM's on walls and roofs.
 

pswallace

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...Great help guys,thanks... 'Build A shed mikes way' very informative. 'didn't know OSB could act as vapour barrier !
 
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