I run a roofing company and can tell you guys a few tips to avoid ruining any of your roof decks. The best way to avoid condensation is to have the moisture hit the vapour barrier first. We just built a brand new sugar house this year, with a 6/12 roof pitch. And prior to installing the strapping I vapour barriered the top of the roof truss. It is a little more work but you can support the trust from moving by tacking a few straps to the underside of the roof trust first. Then as apply vapour barrier and the roof straps on 16" or 24" you can line up the trust and knock off the lower straps. I would strongly advised not to install plywood. Plywood doesn't like moisture. Roof boards are a better option. However installing any of these first and the vapour barrier after, will create a barrier on top of the wood. Keep in mind the vapour barrier is a preventive measure to stop moisture from penetrating the roof from the outside of the building. And unless the product has what is called a "PERM" factor higher than 1 it will trap moisture from the inside as well. 15"lb felt paper will not allow moisture to pass either way. In our roofing business we use a product called Titanium UDL 50, it a commercial grade vapour barrier. It can breath a little from the inside. Anyways in closing if you apply the vapour barrier on top of the wood, the wood will act like a sponge and suck up the moisture. If it is dripping it will rot in time. And will need replacing in the future. I will try to post a few picture of our building.
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Originally Posted by Clamer33
