Comments on: Cold Roof

By: Roof Masters

Roof Masters — Thu, 02 May 2013 14:15:55 +0000

That’s right, in addition. Proper ventilation is essential. It prevents condensation and dry rot within the attic wood structure and wood substrates, prevents mould, and prevents warping of the plywood. Proper venting also extends the life of the shingles and roof membranes. Provide ventilation in a ratio of approximately 1:300 of the insulated area. Ideally air should enter the vented soffit, rise as heated in the attic, and exit near the peak of the roof.

By: Todd

Todd — Wed, 11 Jan 2012 23:59:28 +0000

Check this out: http://www.homeconstructionimprovement.com/wp-content/uploads/2012/01/SIP-Panel-Splice.jpg

By: Todd

Todd — Wed, 11 Jan 2012 22:23:24 +0000

I’m going to add a picture of it to the article tonight. I’m also going to tape a short video as I think others will find it interesting.

By: jeff_williams

jeff_williams — Wed, 11 Jan 2012 21:33:32 +0000

That’s fantastic. I was picturing the panels just butted together and then taped at the osb level. The slots and holes is a much better system.

By: Todd

Todd — Sat, 07 Jan 2012 14:08:40 +0000

I’ll try to get some pictures this week. Each SIP panel has two slots routed in it the length of the seam. There’s a slot near the top surface of the panel, just under the OSB. That slot is about 1-1/2″ wide on each panel. Once the panels are set we slide a piece of 1/2″ OSB into the slot for the entire length. This acts like a spline. Screws are then driven down from the top of both panels into the spline to keep them held together.

There’s a second slot about the same size located at the middle depth of the foam. Next we drill a 3/8″ hole every 8″ along the seam. The hole penetrates the lower slot. Spray foam is then injected into each hole until it runs out the top. This seals the slot and helps create an air tight seal. All of the foam is then scraped off the top of the panels before the cold roof is applied.

By: jeff_williams

jeff_williams — Sat, 07 Jan 2012 01:35:21 +0000

What’s used to seal the seams of the sips? Anyone developed a tongue and groove sip (one big T to go in one big G) similar to T&G rigid insulation?