Venting Metal Roof Over Shingles

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

Venting metal roof over shingles.

Ventilation that meets code requirements is adequate for any type of roofing material including metal. 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. Metal roof over shingles condensation. Also don t go up on the roof if it s windy.

Metal roofs must be laid flat on a vapor barrier because steel will condensate if there s any air space underneath it. One of the big reasons homeowners choose metal roofing is for the uninterrupted run of metal from the top of the roof to the gutter which reduces the risk of leaks. We do need to mention though one very rare scenario we have seen just a couple of times over our 35 years. 3 install 1 4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1 4 purlins over the shingle roof.

If it s slightly windy keep the steel downwind from you so a gust of wind doesn t knock you over. Cool outside air travels under the shingles to the vented ridge pulling out moisture and heat.