How To Install Metal Roofing Over Shingles Video. Finally, the preparation is over, you can now install the 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.
Sailormn34 / pixabay a steel roof is a lifetime investment, lasting 50 years or more if it’s a good one. Shingle roofing systems have a typical lifespan of 20 to 30 years when properly installed with good quality materials. Sheffield metals always recommends removing the existing shingles so you can properly inspect, repair, and level the roof deck before installing a brand new roof.
The furring strips are 1x4 pine boards.
The metal is then installed on the purlins. Cost to install metal roof over shingles. Purlins can be used to provide space between the old roofing and the new metal roofing panels. Next, use 1 ¼ inch nails.