Roof Life On An Overlay

However if there are mold mildew moss or other growths on the roof or larger leaks an overlay may not be the best option.

Roof life on an overlay.

The double roof will trap extra heat which can warp and otherwise prematurely age the new roof. A roof overlay is the process of adding a layer of shingles and waterproofing over a preexisting roof. When it s deemed practical a lot of localized repairs to the old roof are often done so that a solid foundation is provided for the new roof. An overlayed roof will also have a shorter life span than a roof of the same material that is applied after a tear off.

When weighing the modest savings against the possible uneven appearance reduced life expectancy and risk of future leaks i would advise against an overlay with new shingles. When weighing the modest savings against the possible uneven appearance reduced life expectancy and risk of future leaks i would advise against an overlay with new shingles. This isn t perfect though. The design of re roofing specifications follows the same principles as that of new work but there are added complications arising from the need to adapt reuse or overlay existing materials.

If the existing roof has decayed sufficiently it s just not done. An overlay roof or the act of overlaying a roof is when your roofer puts a second set of shingles directly on top of your existing roof. More problems with overlay. An overlay isn t always possible.

Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. When renewing an existing roof consideration should be given to whether or not the thermal performance of the roof should be improved and the impact that may have on detail work particularly abutments. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. Because of the possible drawbacks of overlay structural problems mainly local building codes may not allow for the overlaying of a roof.

Find a quality roofing contractor who can assess your roof s condition and do the job correctly. Another possible issue with overlaying your roof rather than replacing it is that your local government may not allow such a practice. An overlay may also be an option for roofs with minor leaks. It is most commonly used as a way to extend the life of a roof and save money by not paying removal and disposal costs of the old roof.