Venting Metal Roof Over Shingles

A metal roof typically does not increase nor decrease the need for ventilation.

Venting metal roof over shingles.

To vent the roof holes are cut in the old roof detail 1 above the soffit which pulls air through the soffit vents underneath. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. A steel roof is a lifetime investment lasting 50 years or more if it s a good one. Put the steel down directly on a vapor barrier.

Venting the ridge cool outside air travels under the shingles to the vented ridge pulling out moisture and heat. The options for venting metal roofs are similar to those of other common roofing systems with some special considerations. Ventilation that meets code requirements is adequate for any type of roofing material including metal. We do need to mention though one very rare scenario we have seen just a couple of times over our 35 years.

To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath. 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. It doesn t matter if the air space is a half inch or six inches because the condensation factor will remain the same. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.

Metal roofing is also available in the form of shingles.