Venting Metal Roof Over Shingles

Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.

Venting metal roof over shingles.

A steel roof is a lifetime investment lasting 50 years or more if it s a good one. Metal roof over shingles condensation. Cool outside air travels under the shingles to the vented ridge pulling out moisture and heat. 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.

If you are trying to decide between the two materials it s important to carefully look at the metal over shingle roof problems. 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. Things to know about metal over shingle roof problems.

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. After all you ll be making a significant and long term investment. A metal roof typically does not increase nor decrease the need for ventilation. Metal roofs must be laid flat on a vapor barrier because steel will condensate if there s any air space underneath it.

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. Also don t go up on the roof if it s windy. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. It comes on an easy to install flexible mesh roll and is hand nailable with no complicated fitting wrapping nail gun adapters.

The frame creates a ventilation gap that helps prevent ice dams in the winter and cools the roof and the house in the summer. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. If it s slightly windy keep the steel downwind from you so a gust of wind doesn t knock you over.

Installing metal roofing over shingles can help solve these issues.