Because there is no tear off reroofing can go much faster and be much less expensive than a complete roof replacement.
New roof over existing shingles.
Installation is easier than for a tear off job because you can use the existing shingles as guides for laying the new ones.
Let s start with the good.
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.
If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing.
Mold rot or other significant damage needs to be taken care of with a full replacement not hidden by new materials.
But you must take care to install the shingles correctly so they lie flat.
That s also why building codes commonly limit re roofing to no more than two layers.
Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because.
How to install a roof over an existing roof determine the feasibility.
How to do it remove caps.
The felt should be secured every six inches with nails or staples.
You need a flat surface to install a new roof over existing shingles.
The roof should be in sound.
Install a layer of roofing felt over the roof before you begin installing the new shingles.
The condition of the existing roof is critical.
Why installing new shingles over old shingles can be good.
Old shingles can curl over time.
The layers of felt should be overlapped by 1 inch as you work toward the roof ridge.
There s a lot of visible damage.
However you ll want to check with your local building department before you make any decisions.
Although it sounds like a good idea we can assure you the cons heavily outweigh the pros.
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.
Inspect the condition of your current roof.
Yes you can install a metal roof over shingles.
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.
Multiple layers of shingles can make it difficult or impossible for the nails to penetrate.
In fact the only pro to a shingle over is it s cheaper and cleaner.
This will help keep any moisture from getting under the felt.
When you should tear off your roof and start from scratch instead.
Doing it now will make it easier to keep the reroofing job clean.
Remove the ridge caps.
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.
Reroofing is the process of layering one set of new shingles over a set of existing shingles.
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 roofing over your existing shingles can be a good idea.
