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We recently received a quote for Gerard metal roofing from a local roofer here in Northern CA. He recommended putting the metal directly over 18 year old cedar shakes. There is no plywood sheeting or even tar paper under the existing cedar shakes. Additionally, the cedar shakes are severely warped. Would this harm the look or effectiveness of the metal roof? Should we rip the old shake off or put the roof over the shake? Also, I believe the roof has a low slope to it. This will probably make the roof appear even higher and make the bottom edge more apparent. Yea or nay?
When comparing the metal roof to a new asphalt shingle roof, roofers are giving me virtually the same cost to install, which I find interesting based on the fact people have told me metal costs 2x vs. asphalt roofs. Am I missing some critical installation option I should request, thus increase the cost?
Additionally, how do I know if the existing joists can handle the weight load of metal vs. asphalt shingle?
And lastly, we have severe winds with driving rain up here. Does the standard 120mph warantee cover wind lifting the shingles or does it guarantee water-tight seals agains this driving wind?
Many thanks in advance for any help you can provide.
Marie
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RE: my above question...I am actually comparing the metal roofing to fiberglass composite shingles, not true asphalt shingles. The shingles we are looking at have a 50 year warantee, but I am getting the impression that on composite shingles, this does not guarantee a 50 year roof, or does it? Will I truly get 50 years out of a composite shingle roof vs metal "shake" style roofing?
Marie
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Marie,
Thanks for your posting and questions. Several of your questions are proprietary to the Gerard product you mention and I do not have answers for you. I would urge you to contact Gerard and make these inquiries of them.
There certainly have been numerous installations of metal shingle products over wood shakes. This is also permitted by building codes in your area to the best of my knowledge but you might check with your local building inspector.
There is considerable savings when you keep the old shakes in place. that is what is keeping your cost options similar.
Metal roofing is very low weight. The ultimate total assembly weight of steel over your shakes versus removing the shakes and installing decking and a premium shingle is probably about the same. If you have actual weight concerns, you may want to consult a professional structural engineer.
Most metal shingles require a 3:12 roof pitch, the same as asphalt and fibergalss shingles in most cases. You will wnat to make sure that you never install any roof at lower than its minimum pitch.
Your wind warranty question will need to be answered by Gerard.
I hope this helps at least a little bit. Thanks for thinking of metal. Good luck.
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There have, for many, many years been composition shingles warranted at 25 years and more. However, it is documented that the average life of composition shingle roofs being replaced today is 17 years or less. Ihave seen top quality fiberglass shingles replaced in four years several times in brutal climates.
2/21/2004
2/21/2004
Isaiah Industries, Inc.
2/21/2004
Isaiah Industries, Inc.
2/21/2004