In this case you can build a new roof over the old with a caveat.
How to build a new roof over the existing roof.
This provides added protection against ice dams.
Roofing over your existing roof is not always possible.
Unfortunately it s not an option for everyone.
I have finally confirmed that it s allowed in ontario provided the plan passes the building inspector.
Putting a new roof over a leaking roof won t remove the leaks.
Your roof is soft and spongy feeling if when walking on your roof the majority of it feels soft and spongy you may have some problems with the underlying sheathing of the roof.
There are a few situations where roofing over an existing roof just isn t possible.
We do not want to remove the existing roof so we are proposing to build directly over the old roof.
Yippee the next.
We are doing all the work ourselves so tearing off the old roof would be a real problem.
You must not build the new roof directly over the old.
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A mobile home roof over involves placing a new roof or roofing material over your existing roof there s little to no material removed which can keep costs down.
A new coat of shingles over decaying shingles will cause your roof deck to decay.
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.
A mobile home roof over creates a unique opportunity to completely change the look of the home.
The new roof will be a metal roof.
Sounds simple enough right.
When you recover your old roof stays and the new roof gets installed on top.
Less labor is needed and there are much smaller refuse fees.
Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option a properly installed layover roof can look and function as well.