Guest User
I am planning on installing corrugated galvalume 26" wide sheet panels over a 1/2" plywood deck at 4/12 pitch. I have 3 questions: 1. Do I need a felt underlayment? 2. I need to flash roof plumbing vents and possibly some solartube skylights. Do you have any flashing details for this type of roofing? 3. Can you recommend a metal roofing type that has hidden fasteners that comes close to the cost of the corrugated roofing?
Allan Reid
Dura-Loc Roofing Systems, Inc.
The building code calls for a moisture barrier under any roof covering. Felt is the most economical however remember you are putting on a permanant roof so you may want to upgrade. You need to get the falshing details from the manufacturer of the product you choose and I would also check with the tube mfg and get their recommendations. Now the cost and we are limited as an association in comments however the thicker the steel, the more the money. The better metalic coating say a G90 over a G60, the longer it will last and the more it costs. The better the paint system agaoin the more it costs and finally corrigated roofing makes the most coverage out of a flat sheet of steel where concealed fastener systems use more steel as they require narrower sheets with flanges and more joints. Don't forget that the building code calls for specific ventilation needs so choose a product that meets these needs as well. You are going to have to make a value decision.
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