Nail this edging into the roof using galvanized roofing nails. Metal roofs are more efficient at handling common hail impacts than asphalt shingles.
Leave the old valley flashing in place, and install new over it.
How to install metal roofing over asphalt shingles. Install the metal edging around the entire perimeter of the roof. Finally, the preparation is over, you can now install the shingles. Install another set of starter shingles at the sides of the roof, ensure the two sets overlap.
Lay a metal roofing panel over the existing roof material in the bottom corner of the roof surface, and fasten to the roof according to the metal panel instructions; Once the roofing system is properly repaired, the new underlayment can be placed and the metal roofing system installed. Attach your metal sheets to the framing.
Place these along every six inches of the metal roof flashing. The first is to apply an approved underlayment over the old shingles. Then you will have a roof that will last almost indefinitely.
Again start at the bottom and nail the shingles into place. The shingles need to be offset in every space, so there are no valleys or blank spaces where a leak will start. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof.
Installing metal roofing panels over shingles. Because metal roofs are so light yet so strong, metal roofing panels can typically be easily installed over your existing asphalt roof shingles without the need to add structural reinforcement. Make sure that the sheets cover the whole roof area.
Metal roofs often are, especially if made of aluminum, which has a high scrap value. Roof slope is 3:12 and there is no attic. If you wish to install metal roofing over shingles, it’s recommended to do it one of two ways.
Would it make sense to add foam insulation between old roof and new metal shingles to keep house cooler in a summer. One of the first steps to take when you want to install metal roofing over asphalt shingles is to be aware of the mechanical issues that need to be resolved for you to accomplish this project. Because asphalt shingles are routinely exposed 5 in., rip down the first strip (the starter course) so that it is 5 in.
With water running across and down your shingles, it’s nearly impossible to find the origin of the leak in your roof. You won’t get to replace crucial roofing materials Then lay it over the original (old) first course so that the strip is flush against the butts of the original second.
One of these issues is how the old roof is ventilated and whether this would become a problem when you place the metal roofing over the asphalt roof. When the felt is secured you can start laying the metal shingles. Use metal roofing screws to attach the shingles in place.
Start on the lower edge of the roof, install the starter shingles by nailing them down using roofing nails. 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. One after the other, starting with one side and from the top, install the sheets and attack the screws two feet away from each other.
There are a number of considerations when installing metal panels over an existing asphalt shingle roof. Although many metal roof systems can be applied over an existing roof, layovers are more commonly done with asphalt shingles. Install the metal flashing and ridge cap on top of this.
This is the fastest way to install but it doesn’t provide the flattest surface for metal roofing installation. First, the building codes allow metal over shingles if there is only one layer of asphalt shingles. However, the process for separating and recycling asphalt shingles is much more costly and isn’t yet a common.
Install the first row of shingles at the top, along the entire length of the roof. Metal shingles are installed from the top down rather than the other way round as with asphalt shingles. You should follow the manufacturer’s instructions for installing the metal roof, but in general, you need to provide some ventilation under the metal to allow moist air to escape.
Briefly i want to install metal shingle roof over two layers of old aspalt shingles on my cottage. Also, two layers of shingles weigh quite a bit. Choose a shingle style with the.
Then work your way up to the top or center of the roof. Make sure that each sheet overlaps the first one. A third roof is not allowed, so there must only be one shingle roof in place.
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. Besides, metal roofing materials weigh much less than the shingles, making it easier for you to install then over shingles.