Question about metal roofing?
Question:I am contemplating a new metal roof for my mobile home. It will be installed over an existing metal roof on which I have installed 1x2 furring strips screwed to the trusses 24" inches OC for attachment and ventilation. I have included 3/4" styrofoam for insulation and sound deadening. I have almost no roof jacks on the front side of the roof, but on the back side the jacks are clustered together in a small space. In a perfect world, I want all the jacks to wind up in a the valley or flat of the metal rather than on one of the ribs. Is there a method of trimming the metal to accomplish this?, or am I forced to use a lead jack if I wind up with a pipe through the rib? Sealing the side of the jack towards the peak is another question I have, Do I cut the metal and slide the edge of the jack under the metal and then seal with mastic or collect the water on the top edge and check it every year? Any experienced installers out there want to take a crack at this question? Thanks in advance
Answers:
The company I buy all our metal roofing from, Union Corrugating, has a pipe boot that has a flexible base that can be formed t the ribs and the flat. We use Geocel Silicone to seal it to the metal. The main thing is to make sure you have a good continious line of silicon between the boot and the metal. You can also seal around the outside of the boot to make sure there is no leaks.
You are better off installing plywood and then regular shingles on instead of metal roofing.
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