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.
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.
Can you put steel roofing over asphalt.
Besides the necessary roofing skills you will need to learn tips specific to shingles installation.
So if your roof has two layers it may require a complete tear off even though steel is lighter than asphalt.
However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof.
This method has its benefits as well.
Metal roofing weighs less than one pound per square foot.
Some contractors feel that there is a problem with too much weight causing stress on the roof trusses and that condensation could be an issue.
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.
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.
Installing shingles over metal roofing is not a thing that you should even try to do.
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.
Disadvantages of metal roofs.
However you can install metal roofing over the asphalt shingles but vice versa is not recommended.
Otherwise you will need to remove the shingles.
Asphalt shingles can weigh up to four pounds per square foot depending on the brand.
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.
A metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles.
If you don t want to take our word for it check with your local building department.
In some areas building officials only allow a re roof over one layer of 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.
Can you put metal roof over shingles the reason why this is important is because a shingle roof is granulated very similar to sandpaper.
Metal roofs over shingles will also provide an extra layer covering your home helping to further insulate it.
On has the metal expands and contracts due to weather changes the metal will actually move.
