Ventilate Your Attic

Then aim for about 1 sq.

Ventilate your attic.

In other words the entire vent opening doesn t count as vented space. Your actual living space is sealed and insulated at the attic floor the attic is outside this envelope. First determine your attic area by multiplying the length by the width. An attic fan works by exchanging the hot air in your attic space for fresh air pulled through the vents.

That said air resistance and interference such as vent grates reduces the area of true ventilation. Don t avoid ventilating your attic for fear you re letting cold air into the house. Jones takes this measurement and divides it by 150 for a total of 7 36 square feet of ventilation space that is needed. The building code lets you reduce that by half under some conditions but more roof ventilation is usually better.

Attic for example has an area of 1 200 sq. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. It helps prevent ice dams in winter by keeping your roof colder. In of vent opening per 150 sq.

If there are asphalt shingles on your roof the attic must be ventilated to comply with the terms of the manufacturer s warranty. To properly ventilate an attic two types of vents are needed. Intake vents located at the lowest part of the roof under the eaves allow cool. It s a standalone unit that s about two feet tall and 18 inches wide and has wheels for mobility.

Once they are in place you can then place the batts or blankets or blow insulation right out to the very edge of the attic floor. This yields a total area of 1 104 square feet. A 30 x 40 ft. Rafter vents should be placed in your attic ceiling in between the rafters at the point where your attic ceiling meets your attic floor.

Most come with a window kit for this purpose that attaches to a hose on the back of the unit. Portable air conditioners do need to be vented to pump the hot air outside. Jones has an attic space that measures 23 feet by 48 feet. A portable air conditioner is the easiest solution for cooling your attic.

Intake vents which are located at the down slope edge of the roof aka eave s and allow fresh air into the attic. This will help to avoid premature damage to the shingles or mold building up in moist hot.