Installing metal roof over rolled asphalt

Guest User
8/15/2002
Hello, my father and I are planning on installing metal roofing at our cabin. He has purchased the vertical panel type in 12' lengths. Right now, the cabin has rolled asphalt roofing. Is it alright to put down some heavy roofing felt and install the metal roof right over the older asphalt? Should we install some sort of wood slats before installing the metal roof? Thanks for any help...
Todd Miller
Classic Products, Inc.
8/16/2002
First, I would strongly urge you to follow the manufacturers' instructions as they pertain to installtion. Generally, many of these products were originally designed for installation over an airspace. If that is done, you ought to consider running vertical battens first and then horizontal battens. This would create a soffit to ridge airspace that could be ventilated for maximum efficiency. That said, though, these products are often installed direct to decking or over old shingles. In either case, you need a layer of underlayment such as 30 - pound felt or a poly-based underlayment. Particularly if you go over the old shingles, this would protect the back of the metal from the mineral surface of the old shingles. If the old rolled roofing is in real bad shaped, that could negatively affect installation of the new products and I would suggest removing it first, or perhaps putting some fasteners in it to get it to lay flat.
Guest User
8/22/2002
can i do this myself and at about what cost compared to aspalt
Todd Miller
Classic Products, Inc.
8/23/2002
You can visit local lumberyards and home centers to inquire about metal roofing they offer. You can also contact manufacturers through this site. Some products are available for homeowner installation. Based upon your roof configuration and the installation requirements of the product you choose, you'd have to decide whether you want to invest the time in installing it. In some cases, you may need a few special tools. As far as price, because the Metal Roofing Alliance is a coalition of competing manufacturers, our antitrust guidelines prohibit us from discussing price in a public forum such as this. Any of the above sources, though, could supply pricing details to you.
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