Venting Metal Roof Over Shingles

Metal roofs must be laid flat on a vapor barrier because steel will condensate if there s any air space underneath it.

Venting metal roof over shingles.

The options for venting metal roofs are similar to those of other common roofing systems with some special considerations. A metal roof typically does not increase nor decrease the need for ventilation. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. We do need to mention though one very rare scenario we have seen just a couple of times over our 35 years.

This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. Ventilation that meets code requirements is adequate for any type of roofing material including metal. If it s slightly windy keep the steel downwind from you so a gust of wind doesn t knock you over. Venting the eaves to vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath.

Bjorn asks i have a new house with a metal roof and without a ridge vent. 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. Metal roof over shingles condensation. Also don t go up on the roof if it s windy.