Metal Roof Over Sips

I did this on a house similar to what you are describing.

Metal roof over sips.

Over top of sip assembly to create vertical air movement eave to ridge between sips and metal roof. Bottom interior side of the sip roof is properly air sealed and if one properly installs a peel stick membrane on the sip roof and then install a metal roof on top i don t see why one would have any issues and necessitate a cold roof design. But lin wants to add 2 inches of rigid foam on top of the panels to reduce thermal bridging. Fasten metal roof panel directly through accepted self sealing roof underlayment it is important that the.

I have a new structure with 12 1 4 structural insulated panel roof at a 2 12 pitch. Roger lin s washington d c house will have a roof of 12 inch thick structural insulated panels sips. Extreme s pre insulated sips offer an option for a high performance roof framing solution that is 15 times tighter than conventional construction practices making it easier to control indoor air environment. He s uncertain about the details.

The low pitch is due to code which requires me to retain the snow load there is no attic space to ventilate and the roofing must be. By most standards that s a well insulated roof. This will ensure ventilation of moisture build up through vented ridge assembly. The pitch of the roof is very low only 1 2 inch in 12 and the metal roofing has been applied directly over the sips with no air channel beneath the roofing for ventilation.

Several assemblies that prevent shingle ridging are described in the builder s guide to structural insulated panels sips. Cold roofs help protect the sip osb from. Metal roofing over insulated sip panels. The ridges caused by the expansion of sip roof panels may be an aesthetic blemish but it does not affect the performance of the roofing or the sip roof panels.

The top of the sip gets a type of roof tar applied over the joints. Build for the future with extreme s structural insulated panels sips the high thermal values and strength properties of extreme s sips are highly beneficial for roof construction. I would cover the entire roof with ice and water shield as someone else suggested. When the house was built melton sealed the seams between roof panels with tape applied on the bottom of the panels.

Specifying a cold roof or simply over sheathing the roof. June 21 2009 filed under.