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Old 06-01-2012, 10:25 PM   #1
jschaben
 
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Metal roofing install


After a visit from a tornado over the memorial weekend, it appears we are in the market for a roof. The roof isn't gone, just invaded by several large tree branches so will need a couple of rafters taken care of and three or four sheets of sheathing replaced. Have all but settled on replacing it with a metal roof but have heard a couple of conflicting (or it seems to me) methods of installing the stuff. One is to remove all existing shingles and lay down two or three layers of roofing felt(? maybe they didn't say felt, but some other product) or leave the existing shingles there and just install the metal over them (I'm gonna assume firring strips or something similar to attach them to.
My question is are either or both of these acceptable approachs, and is one preferred over the other or another approach altogether. I have all but zero knowledge of roofing. Patched a few very minor leaks over the with varying degrees of success

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Old 06-02-2012, 01:05 PM   #2
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Metal roofing install


I, personally, do not like going over existing shingles.

Some manufacturers allow for it with a proper slip layer but we prefer to remove all the old crap and get right down to the deck and make sure it is complete and squared away.

You can do both but the only benefit to going over-top of asphalt is saving on dump and removal fees.

Beyond that, there are bunch of rationales for the type of installations.

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Old 06-02-2012, 05:11 PM   #3
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Metal roofing install


Quote:
Originally Posted by Windows on Wash View Post
I, personally, do not like going over existing shingles.

Some manufacturers allow for it with a proper slip layer but we prefer to remove all the old crap and get right down to the deck and make sure it is complete and squared away.

You can do both but the only benefit to going over-top of asphalt is saving on dump and removal fees.

Beyond that, there are bunch of rationales for the type of installations.
Thanks for the response. Since we need to replace some sheathing as well as repair some rafters, removing will probably make the most sense. I also heard that laying it directly on some type of underlayment would make it more resistant to hail damage as the metal would have more support than just firring strips.
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Old 06-02-2012, 09:23 PM   #4
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Metal roofing install


Solid decking with help with hail damage butif it is big enough...it's going to show.

Purlins and over deck venting are beneficial for additional moisture control and heat control.
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