I am getting ready to put a new metal roof on an existing house. The roof sheathing is homosote (which also acts as the insulation). There is no ventilation space. I was wondering what people’s experience was regarding putting strapping (2′ on center) on top of the homosote. This would allow an airspace to ventilate the roof in the summer. Will I have a condensation problem in the winter? I live in the western NC mountains where the winter lows are often in the single digets or low minus temperatures. Any thoughts?
Thanks
Skip
Replies
I'm not familiar with homosote, but I do know that the metal roof will condensate and therefor will need some type of roofing paper underneath it.
As far as the strapping goes I would think that you would have to run two layers of it. The first layer would be run parallel with your trusses or rafters and the next layer would have to be run parallel with the peak of the roof or just sheeted with OSB or CDX.
Dave
Boy, the first thing I want to know is what type of roof was on there before. I have worked on the panels before and strapping was always the way to go. I have seen both vertical and horizontal. Did they nail directly into the panels? Going with the vertical then horizontal is the best option. As for a moister barrier good luck it has to be on the panels to do the best job but fastening it will be tricky. How thick are the panels ?
Edited 3/30/2002 10:34:15 PM ET by All Trade