Roofing Over Shingles With Metal

Metal roofing weighs less than one pound per square foot.

Roofing over shingles with metal.

Now there are metal shingles and panels that imitate materials like slate tile wood shake and even asphalt. Asphalt shingle roofing is a dominant material for residences. 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. However metal roofing is surging in popularity as more aesthetic options become available.

Metal is the best choice due to its very low weight per square foot and its unique design. If you don t want to take our word for it check with your local building department. However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof. The second way to install a metal roof over a shingle roof is with the use of purlins or battens.

A galvanized steel metal roof is highly susceptible to corrosion and rust over a period of time. As you probably know a metal roof is a major initial investment so knowing some of the drawbacks of this roofing material is important. This method has its benefits as well. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps.

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. 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. A metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles. 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. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof. Advantages of metal roofs over shingles. In a standing seam roof long single panels run vertically all the way from the eave to the ridge.

Below are some of the most common cons of a metal paneled roof. Asphalt shingles can weigh up to four pounds per square foot depending on the brand. Metal roofs over shingles will also provide an extra layer covering your home helping to further insulate it.