Putting Metal Roofing Over Old Roofing

This provides added protection against ice dams.

Putting metal roofing over old roofing.

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. However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. Should old shingles be removed before new installation. To vent the roof holes are cut in the old roof detail 1 above the soffit which pulls air through the soffit vents underneath.

Reroofing is the practice that involves installing a new roof over an existing one. The installation of metal roofing is often easier and faster than other roof types and because of its simple design and generally large size can actually be installed directly on top of existing roofing materials like asphalt shingles and foam roofing. Installing metal roofing over existing roofing material can usually be successfully. But is this a good idea.

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. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Cool outside air then travels under the shingles to the vented ridge detail 2 pulling out moisture and heat. Doesn t provide the flattest surface for the metal roofing to be installed over each course of shingles is about a 1 8 higher than the course just below it.

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. March 11 2020 by safe harbor roofing. Should you tear off the old roof and start over or simply remove the fasteners from the existing roof and install another roof over it. 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.

Some roofers recommend this practice to homeowners who are planning on switching from an asphalt shingle roof. Pros and cons for metal roofing installation.