Can You Have Two Layers Of Shingles On A Roof

If you don t tear off the old layer you can t examine the decking.

Can you have two layers of shingles on a roof.

The main case for adding a second layer of shingles is simplicity. Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles. Affects inspection reports. The short answer is yes.

There are some advantages to roofing over existing shingles says dale richards owner of richards roofing in troy michigan. If there is one thing that i love about my industry it is that things are constantly changing. This is especially true if you ve overlayed your new shingles on top of warped shingles. The second layer of shingles will trap heat which can result in the decomposition of both roof layers.

The standard practice was that you could install a new layer of singles directly over the old layer during a re roof. When i started my real estate career i sold homes with three layers of roofing. Having multiple layers of shingles is going to make your roof hotter because the heat gets trapped between the layers which could mean premature aging of the shingles. Any more than that and you d have to tear off the old shingles before installing a new layer.

Though both these points are valid you will end up spending the same amount of money or more later to have two layers of shingles removed. Reasons why you should not add a second layer of shingles it will shorten the lifespan of your roof. And roofing guidelines are no exception to the rule. The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says.

Most people would limit this practice to a total of two layers of shingles. If the structure can support the added weight a typical 20 square 2 000 square foot reroof will cost at least 1 000 less than a tear off job. Therefore if you already have two layers you ll need a full tear off. For a second layer to be as good as a roof tear off you would have to have sound decking no leaks and a roof with no sidewalls where flashing is needed in order to tie the tiles in to the exterior walls.

The taylor made team. In fact the extra layer can reduce your roof s lifespan by up to 40. Another issue is that when you add in the second layer it can add extra weight to your roof. Additionally if your roof is severely damaged it likely won t be able to support the weight of a reroof and will need to be torn off.

As mentioned above homeowners are legally limited to two layer of roof shingles. Now for the why.