Contractors are always looking for ways to install, it does so with a saving in costs of labor and materials are available. Here are some important answers to frequently asked questions.
1 Should I have a metal roof directly over an asphalt-shingle? No, why?
Premature failure: Metal has a high degree of thermal expansion and contraction. As the roof heats up and cools down, it moves along both its length and width. Directly against the lawsGranules on asphalt, gravel, this movement has scratches on the underside of the steel plate and possibly naked, thus potentially exposing that cause premature failure corrosion. Warranty void: The installation of a metal plate directly on top of an abrasive, in most cases voids the warranty of guarantee against corrosion (this applies only to a panel of galvanized steel is not a guarantee against Corrosion Galvalume door). Form: The jury will take the form of crude oil belowSurface and expose the problems in many cases that were previously hidden. 2 What happens when you establish a base before the metal roof?
This is certainly a better choice, but you will still have the same concerns in relation to the form (see above) and, if the document you want to wear and expose the metal on the asphalt shingle is the potential for premature failure that results in warranty expires. If you decide that this willThe installation method would be recommended underlayments and Grace Tri-Flex IKO roof garden. They are impervious to moisture and high tear resistance. MMR does not recommend the use of # 15 or # 30 roofing felt (tar paper) for this application. 3 This means that it should be naked all the asphalt shingle roofs to fire the first metal? No MMR recommended stripping the existing asphalt shingles, but we know that the time and budget constraints do not always together. Here 'recommended procedure for re-roofing on a roof of asphalt shingles:
Roof deck: Make sure you choose the existing roof gravel, if it is suitable as a barrier against condensation. Remember that a metal roof is, to some extent, the development of condensation on the underside of the panels. The areas that show signs of previous water penetration (primer is soft or spongy) or should show damage (missing or deteriorated shingles), such as disinfection and proofedwith the use of ice and water shield, and a suitable sealant (if necessary). Ridges and Hips: Remove the cover to prevent shingles, a hump. When he exhibited his place with the threat of rain / snow, cover with a blanket or canvas support. The edges of the roof of asphalt shingles cut excess flush with the fascia / rake boards. This also allows the existing drip edge. This allows you to install the gutter / trim rake true, the house with a clean, snug fit of the bandTables. Firring (Band): Hips, Ridge and all the projections 9 to 12 inches wide on all sides with plywood, OSB or similar coverage (to match other wood thickness). Valleys: 16 to 24 cm in width on both sides with plywood, OSB or similar coverage (to match other wood thickness). Gable & page edges Height: 1 "X 3" size of pine or similar firring light-gauge steel frame, back from the edge by "-", so they do not drive the trim. Interior of roof deck: 1 "X 3" Spruce firringSimilar size or light-gauge steel frame, mounted horizontally about 16 "OC (to use every second cycle of shingles are your guides). 4 All this sounds like a lot of work. Why can not I just strip the roof? This is a valid comment, and many business owners / homeowners decide to do just that. Here are the considerations for both options:
Leave the existing roof in place:
Pros: No need to pay landfill fees; Pros: You do not need a new roof in the background until the existing roof must be paidsuitable as a barrier against condensation; Pros: If you firring, creates an air barrier between the metal and the roof. This allows condensation that develops on the underside of the plate to dry too quickly; Pros: If you firring, reduces heat transfer to the roof terrace sits beneath as the sheet off the gravel on the asphalt; Pros: If you firring, allows the cost of leveling the surface of the roof, if necessary; Pros: Reduces the load on landfills every placeYear; Cons: Does not allow a thorough inspection of the roof before installing the new roof. Cons: It makes the installation of snow guards may be more difficult and less secure; Neutral: not all building codes (areas threatened by Hurricane require special installation to a fixed bridge with UL-90 rated clips) accepted. Remove existing roof:
Pros: Allows you to check the condition of the roof terrace and repairs, if necessary; Pros: Provides a smooth, flat area on which the roofto install; Pros: Protects and depth to properly install a water and ice; Pros: Provides a solid, unified, snow guards can be mounted if necessary; Pros: Provides a solid surface for fasteners; Cons: Additional costs of disposal and landfill charges; Cons: Additional cost of new roof surface. 5 Do you have pictures that clearly show the palace of a roof? Absolutely.
Photo No. 1
