1 remove the shingles before installing the metal roof the first way to install a metal roof over shingles is by completely removing the old shingles before installing the new metal roof.
Can u put metal roofing over shingles.
The purlins are screwed or nailed down to the roof deck depending on how the metal roofing manufacturer has testing for their roofing panels and then the metal is installed to the purlins.
By placing metal roofing over shingles you can save in the labor costs of ripping them off while also preventing them from being thrown into landfills.
Can you put steel roofing over asphalt.
Metal roofing weighs less than one pound per square foot.
The second way to install a metal roof over a shingle roof is with the use of purlins or battens.
Asphalt shingles can weigh up to four pounds per square foot depending on the brand.
Disadvantages of metal roofs.
However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof.
A benefit to doing it this way is that you can see if there is any rotten plywood that needs to be replaced before installing the new roof.
Most codes now allow no more than two layers of roofing before requiring a complete tear off.
Can you put metal roof over shingles the reason why this is important is because a shingle roof is granulated very similar to sandpaper.
As you can imagine there are a lot of differing opinions on whether it is permissible to put metal over the top of other roofing materials.
So if your roof has two layers it may require a complete tear off even though steel is lighter than asphalt.
A metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles.
Installing a metal roof over shingles can also result in an increased chance of trapped water vapor and moisture between the new roof and old roof resulting in new mold and rot.
However you can install metal roofing over the asphalt shingles but vice versa is not recommended.
By removing the old roof before the new roof s installation you are able to give the underlayment a thorough inspection to ensure there are no damages that could.
Besides the necessary roofing skills you will need to learn tips specific to shingles installation.
Metal roofs over shingles will also provide an extra layer covering your home helping to further insulate it.
If you don t want to take our word for it check with your local building department.
Otherwise you will need to remove the shingles.
Can you avoid tearing off your old asphalt shingle roof by putting a steel roof over it.
Installing shingles over metal roofing is not a thing that you should even try to do.
On has the metal expands and contracts due to weather changes the metal will actually move.
