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.

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 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. 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.

Another possible issue with overlaying your roof rather than replacing it is that your local government may not allow such a practice. Before an overlay is considered it is vital that you understand that an overlay must be done to the entire roof not just parts of your roof. 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. An overlay may also be an option for roofs with minor leaks.

Because of the possible drawbacks of overlay structural problems mainly local building codes may not allow for the overlaying of a roof. A roof overlay is the process of adding a layer of shingles and waterproofing over a preexisting roof. More problems with overlay. This isn t perfect though.

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. The double roof will trap extra heat which can warp and otherwise prematurely age the new roof. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.

While this isn t the most common method of roofing it does happen especially when homeowners are hoping to save a bit of money on their overall roofing costs. An overlay isn t always possible. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. 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.