Venting Metal Roof Over Shingles

Ventilation that meets code requirements is adequate for any type of roofing material including metal.

Venting metal roof over shingles.

Cool outside air then travels under the shingles to the vented ridge detail 2 pulling out moisture and heat. Pros and cons for metal roofing installation. Ventilation basics roof ventilation depends on the simple scientific. Metal roofing is also available in the form of shingles.

To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath. We do need to mention though one very rare scenario we have seen just a couple of times over our 35 years. Metal roof over shingles condensation metal roofs must be laid flat on a vapor barrier because steel will condensate if there s any air space underneath it. Venting the ridge cool outside air travels under the shingles to the vented ridge pulling out moisture and heat.

Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. It doesn t matter if the air space is a half inch or six inches because the condensation factor will remain the same. The options for venting metal roofs are similar to those of other common roofing systems with some special considerations. To vent the roof holes are cut in the old roof detail 1 above the soffit which pulls air through the soffit vents underneath.

Put the steel down directly on a vapor barrier.