The roof should be in sound.
New roof over existing shingles.
Installing new roof shingles over old effectively doubles the weight of the roofing so you have to make sure your roof structure can handle the extra load.
The condition of the existing roof is critical.
The layers of felt should be overlapped by 1 inch as you work toward the roof ridge.
Although it sounds like a good idea we can assure you the cons heavily outweigh the pros.
Let s start with the good.
Why installing new shingles over old shingles can be good.
Old shingles can curl over time.
Reroofing is the process of layering one set of new shingles over a set of existing shingles.
There s a lot of visible damage.
If a shingle is.
You can save money because there s no dump fee for removing your old roofing and there s no need for additional felt paper over the old roof.
Doing it now will make it easier to keep the reroofing job clean.
But you must take care to install the shingles correctly so they lie flat.
You need a flat surface to install a new roof over existing shingles.
How to do it remove caps.
Because there is no tear off reroofing can go much faster and be much less expensive than a complete roof replacement.
Mold rot or other significant damage needs to be taken care of with a full replacement not hidden by new materials.
How to install a roof over an existing roof determine the feasibility.
Multiple layers of shingles can make it difficult or impossible for the nails to penetrate.
If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing.
When contemplating a new roof many people hope to simply do a shingle over and avoid the extra cost and mess of tearing off the existing roof and starting from scratch.
Remove the ridge caps.
That s also why building codes commonly limit re roofing to no more than two layers.
Use a flat pry bar.
However you ll want to check with your local building department before you make any decisions.
Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because.
Building officials in some areas will only allow a re roof over one layer of shingles while officials in other places may allow you to place the roof over two layers of shingles.
Installation is easier than for a tear off job because you can use the existing shingles as guides for laying the new ones.
Yes you can install a metal roof over shingles.
The felt should be secured every six inches with nails or staples.
It can only be done once so if you already have two layers of roofing in place reroofing is not an option for you.
When you should tear off your roof and start from scratch instead.
Install a layer of roofing felt over the roof before you begin installing the new shingles.
Inspect the condition of your current roof.
Remove air vents and pipe flashings by prying out or unscrewing the fasteners holding the fixture.
