Roofing Over Existing Shingles

Let s start with the good.

Roofing over existing shingles.

Plus the hours of labor go down and less equipment is used which lowers the cost even more. This provides added protection against ice dams. In a reroof job a special type of drip edge flashing is installed at the eaves and rake to wrap around the existing shingles. The rest of the shingles are full width.

When you should tear off your roof and start from scratch instead. It is the process where roofers install a new roof over your existing one i e. Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because. Its front edge is even with the front edge of the drip edge.

Add a new layer of shingles which means that the old roof will not be removed teared off. Some roofers install a layer of waterproof shingle underlayment wsu over the existing shingles at the eave end as would be done for a roof laid on bare sheathing. Here is a video on how we lay a second layer of asphalt shingles over existing asphalt shingles. Leak around a dormer which the homeowner never knew about long term effects of shingling over shingles.

When roofing over your existing shingles can be a good idea. Roofing over existing shingles on a roof with a 4 12 pitch can easily cost 1 000 less than tearing off and replacing an entire roof. Roofing over an existing roof is also called reroofing or an overlay. In a shingle over if some of the decking has buckled and warped over the years it likely isn t going to be noticed and fixed.

This can lead to increased rot mold and decrease the structural integrity of your home. However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. Hope you like it. Roof over shingle over has its place there are always factors to take into consideration before starting a project.

Why installing new shingles over old shingles can be good. All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof. Re roofers have tricks to lay new roof shingles over old so that the same step ups between courses are maintained but if any old shingles are cupped curled or otherwise misshapen those defects will telegraph through to the new layer.