Thought you would like to see a roof I just finished down by Cedar Run. We used SIP panels under the roof they are 6" thick foam pressured fitted onto 4 x 8 sheets of 7/16" OSB board this gives the roof an impressive R 25. They make even thicker panels that have even higher R values. Since this roof had no insulation and a finished vaulted ceiling, putting the insulation on top of the existing roof was the only solution. I then raped the edges with locally cut hemlock, which will be painted to match the cabin. We put grace ice shield on top the panels and covered it with steel. The steel is the only roof that outlast the attack of the moss and algae on roofs. I had power washed this roof and the algae had literally ate into the asphalt shingle. The algae digests the shingle and makes it have about half the life it would have anywhere else.
So this cabin will stay cool in the summer and warm and dry in the winter. Mountain girl, Paula, logging off.
Since quite a few a you wondered what the roof panels looked like on this project, I took a picture of a small piece of one. This panel has high density foam attached to 7/16 OSB board. When they make SIP's Structural Insulated Panels they put the OSB on both sides and sandwich the foam in between. With it on one side it is called J-deck and is screwed to the top of an existing roof. Here is a picture of the roof finished now covered with steel and the facia painted to match the cabin. Hope that helps answer a few questions. Mountain girl, Paula, logging out.
