How To Install A Metal Roof Over Existing Shillk44

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.

How to install a metal roof over existing shillk44. The vast majority of installations of the metal roofing systems produced by my company are over existing shingles. Venting the eaves to vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath. Installation of metal roofing over shingles. Steel shingles weigh about 1 4 what asphalt shingles weigh and aluminum shingles weigh about 1 8 what standard shingles weigh.

If you choose to install metal roofing over shingles there are certain things you must keep in mind. This is by far the most common way to install a metal roof. Use your 1 1 4. However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life.

We re going to break them down so you know what to look out for. Install the roofing screws vertically along each rib in the panel. As long as the plywood under the shingle roof is in good condition this way can provide many benefits. 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.

Take your first sheet of. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. Address any existing roof leaks and replace rotten rafters or. Add the metal panels.

Always begin working at the point with the longest peak to eave distance. The edging or eave flashing consists of metal strips that are used to cover the perimeter of the 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. But first here are a few precautions about the underlying material.

Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Metal roofing materials are available in several styles that require different fastening applications but are most commonly screwed to the roof framing or sheathing material which in the case of installing over existing roofing material should be fastened using 2 1 2 inch screws.