Roofing Over Shingles With Metal

It provides a solid flat surface to attach the new metal roof to it creates an air gap between the back of the metal and the shingle roof which allows for airflow.

Roofing over shingles with metal.

Metal is the best choice due to its very low weight per square foot and its unique design. You ll be surprised to learn that the primary cause of rusting and corrosion is water. A metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles. In a standing seam roof long single panels run vertically all the way from the eave to the ridge.

The second way to install a metal roof over a shingle roof is with the use of purlins or battens. Now there are metal shingles and panels that imitate materials like slate tile wood shake and even asphalt. Below are some of the most common cons of a metal paneled roof. Metal roofs over shingles will also provide an extra layer covering your home helping to further insulate it.

Advantages of metal roofs over shingles. A galvanized steel metal roof is highly susceptible to corrosion and rust over a period of time. Asphalt shingle roofing is a dominant material for residences. Metal roofing is also available in the form of shingles.

However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof. By placing metal roofing over shingles you can save in the labor costs of ripping them off while also preventing them. This method has its benefits as well. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof.

Asphalt shingles can weigh up to four pounds per square foot depending on the brand. Metal roofing weighs less than one pound per square foot. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. Otherwise you will need to remove the shingles.

As you probably know a metal roof is a major initial investment so knowing some of the drawbacks of this roofing material is important. If you want to install steel over asphalt your best choice for installing metal roofing is to use a steel shingle system like the one shown instead of the more common and more expensive standing seam steel. The purlins are screwed or nailed down to the roof deck depending on how the metal roofing manufacturer has testing for their roofing panels and then the metal is installed to the purlins.