Venting Metal Roof Over Shingles

Doesn t provide the flattest surface for the metal roofing to be installed over each course of shingles is about a 1 8 higher than the course just below it.

Venting metal roof over shingles. 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. Ventilation that meets code requirements is adequate for any type of roofing material including metal. Also don t go up on the roof if it s windy. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof.

A metal roof typically does not increase nor decrease the need for ventilation. A steel roof is a lifetime investment lasting 50 years or more if it s a good one. If it s slightly windy keep the steel downwind from you so a gust of wind doesn t knock you over. Metal roofs must be laid flat on a vapor barrier because steel will condensate if there s any air space underneath it.

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. 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.