How To Vent An Attic Space

In addition insulation baffles must be installed at the point where the attic floor meets the roofline to prevent the attic insulation from migrating into the cavities and restricting the airflow from the soffit vents. Fans and vents may be installed on the roof system that will draw the air out of the attic space and exhaust it to the exterior. The venting path is essentially the same air flows up from the eaves and out at the ridge but creating a vent channel under the roof deck can be challenging.

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Attic vents were developed to help deal with this problem of too much heat accumulating in unfinished attics where it doesn t belong.

How to vent an attic space.

To choose the proper ventilation system for your attic you ll first need to know the total area of your attic. Here are four signs of an unventilated or under ventilated attic. Hot air exhaust vents located at the peak of the roof allow hot air to escape. If you don t see any attic vents on the roof or in the eaves you need to add some.

For this method to be most effective approximately equal amounts of ventilation should be placed at the soffits or eave level and at or near the top of the attic space. Venting the roof deck. So if your attic is 25 by 15 you ll need 2 5 feet of vent space. There are many different kinds on the market today but they all have the same end goal of moving cooler outside air into your attic and pushing that hotter air out known as the stack effect.

If you want to turn the attic into conditioned space or you ve got a room with a cathedral vaulted ceiling insulating and ventilating become more complex. Touch your ceiling on a warm sunny day. These fans may be controlled by a switch or a thermostat which detects heat build up in the attic space and. Whole house fans powered attic fans.

Look at your eaves and roof. If there are asphalt shingles on your roof the attic must be ventilated to comply with the terms of the. A hot ceiling tells you that the attic is acting like a solar oven. Your actual living space is sealed.

Don t avoid ventilating your attic for fear you re letting cold air into the house. Obviously more research is needed but here s what we do know. Then divide the total area by 150 to find the total amount of vent space needed for your attic. Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic.

To determine the area multiply the length times the width in feet. Outside air enters the attic space through soffit or eave vents rises through the attic space as it warms and exits through vents that are positioned at or near the top.

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