How Do I Vent My Attic

So if your attic is 25 by 15 you ll need 2 5 feet of vent space.

How do i vent my attic.

Then divide the total area by 150 to find the total amount of vent space needed for your attic. It does this by creating an area of low pressure on both sides of the vent which pulls the hot air right out of the attic. These fans may be controlled by a switch or a thermostat which detects heat build up in the attic space and. How to check attic ventilation calculate net free vent space.

Whole house fans powered attic fans. Building codes typically require 1 square foot of venting space for every 150 square feet. After creating a space for the vent line the hole with caulk and place the vent inside. 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.

The use of an exhaust vent in conjunction with an intake vent uses the natural forces of wind pressure and thermal effect collectively known as the stack effect to ventilate the attic space. Look at your eaves and roof. Touch your ceiling on a warm sunny day. Set your circular saw at 1 8 inch 0 4 cm greater than the thickness of your roof s soffit when installing an intake vent.

Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic. Then cut out your desired location and screw the vent directly into the soffit. Exhaust vents which are located near or on the ridge line of the roof and allow air to leave the attic. 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.

Most ridge vents use an external baffle system that s designed to pull in cool air and push out warm air regardless of wind direction and force outside. If your attic is not sufficiently vented you probably won t have to look very hard to find signs. Here are four signs of an unventilated or under ventilated attic. If you don t see any attic vents on the roof or in the eaves you need to add some.

Inspect the vent openings. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. A hot ceiling tells you that the attic is acting like a solar oven. 25 x 15 375 and 375 140 2 5.