Posted by jdemaris on May 07, 2014 at 15:53:59 from (70.194.8.87):
In Reply to: OT Metal Roof posted by jhilyer on May 07, 2014 at 12:46:43:
Furring strips over shingles work fine if done right. A story about someone who did it and was plagued with leaks means nothing about the roofing itself. Just means the person did a lousy job. The plus side of using strips over shingles is the labor avoided of stripping the roof and a little extra insulation value with the dead-air space between the new steel and the old roof. The strips ought to be 1 1/2" thick minimum (2 X 4s usually used) and checked with a chalk-line and shimmed where needed to be straight. When you've got a roof with a lot of dips and dives in it - using strips allows you to straighten it out with shims. Can't do that when going directly on the old sheathing. One downside is - having to be careful walking between the furring strips. Especially if you've got thin gauge steel and the strips are 24" apart. Not to hard to put a dent in steel if you step on it wrong.
If using directly on sheathing - you really need at least 5/8" of good solid material to grab if plywood/OSB and also must have the special screws specifically made for use with plywood. I've done a few new roofs with new 5/8" sheathing and steel. On them I used self-sealing "water and ice shield" underlayment like GAF Stormguard, Certainteed Winterguard, etc. But I'm in a high snow and ice area.
I've done a lot of steel roofs over the past 30 year. Exposed fastener type, standing seam, on furring strips and directly on sheathing. No problems or leaks with any of them but I did have to replace some screws/washers on a few old ones.
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