It’s all about air­flow

The Family Handyman - - BEST PRO TIPS -

Roof ven­ti­la­tion is based on the sim­ple fact that warm air rises. In sum­mer, the sun heats air in the at­tic. In win­ter, heat from your home warms at­tic air. In ei­ther sea­son, good vent­ing oc­curs when cool air can en­ter the at­tic near the eaves and exit near the peak. Ide­ally, half of the vent area should be low and half high.

Half of vent area should be high Air flows along un­der­side of roof Ice dam Pool­ing melt­wa­ter Wa­ter con­denses from moist air In­su­la­tion blocks air­flowIn­su­la­tion blocks vents Damp wood and rot Air leak

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