Venting Metal Roof Over Shingles

Pros and cons for metal roofing installation.

Venting metal roof over shingles.

Bjorn asks i have a new house with a metal roof and without a ridge vent. Photo courtesy of trimline building products. Please recommend a vent system without cutting holes in the metal roof there are several options available to provide ventilation to your attic without cutting holes in your metal roof including gable vents and a vented ridge. Put the steel down directly on a vapor barrier.

If a proper roof inspection isn t done the 1x4 s could be installed over rotten plywood which means the screws could pull out. Thanks to modern technology metal roofs are available in all colors and shades and many styles are virtually indistinguishable from traditional asphalt shingles cedar or slate. To vent the roof holes are cut in the old roof detail 1 above the soffit which pulls air through the soffit vents underneath. The other option of course is a vented attic which requires an equal balance of intake and exhaust vents.

Should you vent a metal roof. After all you ll be making a significant and long term investment. Things to know about metal over shingle roof problems. Metal roofing works well with this because the metal is unaffected by heat not being able to pass through it and enter the attic.

Hot air beneath the metal needs an escape route near the top of the roof and intake vents at the bottom of the roof. Ridge vents are installed at the ridgeline of the roof and cap shingles or cap components are placed on top of the vent. In many cases for existing homes this is the easier way to go. Both metal and shingle roofs are great options for your next roofing project.

It provides a solid flat surface to attach the new metal roof to. A steel roof is a lifetime investment lasting 50 years or more if it s a good one. Cool outside air then travels under the shingles to the vented ridge detail 2 pulling out moisture and heat. It doesn t matter if the air space is a half inch or six inches because the condensation factor will remain the same.

If you are trying to decide between the two materials it s important to carefully look at the metal over shingle roof problems. It creates an air gap between the back of the metal and the shingle roof which allows for airflow. Read on for more. To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath.