Ventilate Your Attic

Attic for example has an area of 1 200 sq.

Ventilate your attic.

Rafter vents should be placed in your attic ceiling in between the rafters at the point where your attic ceiling meets your attic floor. 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. It s a standalone unit that s about two feet tall and 18 inches wide and has wheels for mobility. It extends the life of your shingles by keeping the roof cooler in hot weather.

Generally speaking you need a ratio of 1 300 where for every 300 square feet of ceiling space you need 1 square foot of attic ventilation. 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. Most come with a window kit for this purpose that attaches to a hose on the back of the unit.

It helps prevent ice dams in winter by keeping your roof colder. Jones has an attic space that measures 23 feet by 48 feet. In of vent opening per 150 sq. To properly ventilate an attic two types of vents are needed.

This will help to avoid premature damage to the shingles or mold building up in moist hot. Don t avoid ventilating your attic for fear you re letting cold air into the house. A 30 x 40 ft. The building code lets you reduce that by half under some conditions but more roof ventilation is usually better.

A portable air conditioner is the easiest solution for cooling your attic. Portable air conditioners do need to be vented to pump the hot air outside. This yields a total area of 1 104 square feet. If there are asphalt shingles on your roof the attic must be ventilated to comply with the terms of the manufacturer s warranty.

In other words the entire vent opening doesn t count as vented space. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Intake vents located at the lowest part of the roof under the eaves allow cool. That said air resistance and interference such as vent grates reduces the area of true ventilation.

Jones takes this measurement and divides it by 150 for a total of 7 36 square feet of ventilation space that is needed. A well ventilated attic offers four benefits it prevents mildew growth and rot on your roof s framing and sheathing by reducing moisture buildup.