18+ Steel Roof Installation Over Shingles Pics. Yes, you can install a new metal roof over the top of an existing asphalt shingle roof provided there are not too many layers. Some consideration for vent stacks and chimneys is required during the design process.
Overhanging shingles over the drip edge about a half inch can help with surface tension. While steel roofing is a fairly mundane topic, there are still some innovative products that many contractors and homeowners can get excited about. If you don't want to take our word for it check with your local building department.
After that, both layers must come off.
After that, both layers must come off. After that, both layers must come off. Typically the bottom edge of a ventilation flashing sits on top of the shingles and the upper edge is covered over. Metal roofing components are extremely simple: