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You can. But we don't recommend it, and you probably shouldn't. It is called a layover. Putting on an extra layer of shingles. That's because valleys, intersections, steepness make insulation more challenging. These situations also make your second layer more vulnerable. Which always affects the integrity of the roof. So keeping that in mind, your roof Was designed With a particular weight in mind. This doubles the weight of the roof when you put a second layer on.
You would think that the second layer of the roof. It Will make your shingles more waterproof, but it actually has the opposite effect. That's because the second layer of shingles will hide the potential source of the leak as well as keeping you from seeing the underlying plywood that may need to be replaced. Technology has reached a point Where there is enough To keep your roof waterproof. And it's what's under a roof that helps make your roof waterproof and not what's under a single layer of shingles.
If conditions are right, new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing. Installation is easier than for a tear-off job because you can use the existing shingles as guides for laying the new ones. But you must take care to install shingles correctly so they lie flat. And a good job involves installing new flashings rather than relying on the existing ones.
Reroof jobs are sometimes done without replacing flashings. However installing new flashings, including special drip-edge flashings made for reroofing, will ensure a tight seal and a long life. 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. This provides added protection against ice dams.
Asphalt shingles can be laid over cedar shakes or shingles, however, this is a roofing project best left to pros. Beveled wood pieces called "horsefeathers" must be laid along the thick edges of the shakes to make a fairly flat surface. Before you reshingle a roof, read our step-by-step guide for adding new shingles over old ones.
Roofer Corpus Christi Tx
9639 Hillcroft St Unit #5010 Houston, TX 77096
855-909-9544 corpus christi tx