This moisture can lead to mold and mildew forming underneath the shingles.
Put metal roof on wet shingles.
This is by far the most common way to install a metal roof.
Shingles can slip off installing roofing shingles on top of a wet roof can make your new roofing materials slip off and become damaged.
Roof replacement is expensive.
The second way to install a metal roof over a shingle roof is with the use of purlins or battens.
Roofing felt applied over a wet roof deck or shingles applied over wet roofing felt traps a layer of moisture within the roof.
A metal roof can be installed over a shingle roof but you ll need to make sure the plywood under your shingle roof is in good enough shape to handle a new metal roof over top.
A metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles.
However before you decide on reroofing with a metal roof you have to keep in mind that there are specific conditions that make reroofing with a.
As long as the plywood under the shingle roof is in good condition this way can provide many benefits.
Otherwise you will need to remove the shingles.
3 install 1x4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1x4 purlins over the shingle roof.
Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof line.
Install the roofing screws vertically along each rib in the panel.
Some roofing contractors recommend reroofing with standing seam metal because the total roof weight is but a fraction of a standard asphalt shingle roof which helps preserve the roofing integrity.
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.
Be sure the larger edge is laid so that the small edge of the next panel will overlap it.
Choosing to install a metal roof this way can save you some dough and garner all of the benefits of a metal roof in the humid climate of florida.
5install metal panels or shingles.
About prime roofing.
The purlins are screwed or nailed down to the roof deck depending on how the metal roofing manufacture has testing for their roofing panels and then the metal is installed to the purlins.
However you ll want to check with your local building department before you make any decisions.
Yes you can install a metal roof over shingles.
This shortens the effective life of the shingles and can adversely affect the roof sheathing.
