Flat Porch Roof Ventilation

A cold roof or hot roof.

Flat porch roof ventilation.

The joint where the top of the porch roof meets the wall needs to be flashed well and most of the vent details for that look to me like they might leak water under some conditions of rain and wind. Any type of roof from tpo to epdm can be either hot or cold. Problems with porch roofs can cause intrusion of water into the interior of the house. The article notes that the ventilation cannot overcome the significant humidity drive into the flat roof structure caused by small air leaks.

If you have an enclosed porch ceiling have vents to clear the roof cavity of moisture. Though porches are more open to the air they may still have ventilation problems under the roof. Porch roof ventilation options. Hot roofs have the roof deck then insulation then the roofing material.

The answer depends on the type of roof you have. Durable plastic and glass panels in your porch roof provide weather protection while also maximizing natural light. If you plan to include a ceiling fan in your porch make sure you take that into consideration when deciding on the height of your ceiling. Last year i replaced a flat porch roof with a 6 12 pitch.

Porch roofs can also develop ice dam problems like the rest of the house s roof. Proper roof ventilation is an important aspect of home construction. Porches are often attached to the house. It depends on where the insulation is installed.

Consequently the article concludes that the concept of venting a flat roof is no longer safe and instead don 039 t vent the flat roof and install a smart vapor retarder inboard. I installed collar ties to leave an open space above the finished room along with r 15 insullation and installed a fan on a thermostat at the end of the roof in addition to ridge vent to suck all the hot air that collected between the roof and porch ceiling. People have strong and differing opinions on whether roof venting affects shingle life.