Domestic roof construction may also be ventilated to help remove moisture from leakage and condensation. Typically residential, pitched roofs are covered with an underlayment material beneath the roof covering material as a second line of defense. Pitched roofs are designed to shed water but not resist standing water intrusion which can occur during wind-driven rain or ice damming. Flat roofs actually slope up to 10° or 15° but are built to resist intrusion from standing water. Two broad categories of roofs are flat and pitched. One of the main purposes of a roof is to resist water. ![]() Water and water vapor control Ĭontrol of rain is most fundamental, and there are numerous strategies to this end, namely, perfect barriers, drained screens, and mass / storage systems. The control function is at the core of good performance, and in practice focuses, in order of importance, on rain control, air control, heat control, and vapor control.
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