Flat Porch Roof Ventilation

How much ventilation does a flat roof need.

Flat porch roof ventilation.

A cold roof or hot roof. Roof vents help make a home more energy efficient and allow humidity and hot air to escape the. 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. 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.

Porches are often attached to the house. 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. The article notes that the ventilation cannot overcome the significant humidity drive into the flat roof structure caused by small air leaks. Any type of roof from tpo to epdm can be either hot or cold.

Hot roofs have the roof deck then insulation then the roofing material. 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. Last year i replaced a flat porch roof with a 6 12 pitch. It depends on where the insulation is installed.

If you have an enclosed porch ceiling have vents to clear the roof cavity of moisture. Porch roofs can also develop ice dam problems like the rest of the house s roof. Soffit vents have much less risk of water entry. Though porches are more open to the air they may still have ventilation problems under the roof.

The answer depends on the type of roof you have. Porch roof ventilation options. People have strong and differing opinions on whether roof venting affects shingle life.