Proper Way To Ventilate An Attic

Attic hatch or door.

Proper way to ventilate an attic.

Attic for example has an area of 1 200 sq. Most building codes require a ratio of 1 150 ventilation space to attic floor space. If you re finishing your attic insulating it to the proper r value can cause a dramatic loss of headroom if you limit yourself to fiberglass batts. Then aim for about 1 sq.

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. Hot air exhaust vents located at the peak of the roof allow hot air to escape. Pull down stair or ladder. Before we explore how to ventilate an attic space it is prudent to understand how much ventilation is needed.

Danny says if you cannot access it from the attic space the only way to provide the necessary venting is to actually cut a hole in the roof to gain access certainly an extreme measure but the only way i would know to be able to accomplish that. Add weatherstripping around the perimeter and a sweep to the door of a walk up attic. How many vents do you need. Affix rigid foam insulation to the attic side of the hatch or door.

Rafter vents should be placed in your attic ceiling in between the rafters at the point where your attic ceiling meets your attic floor. One last thought attic ventilation is not there to get rid of heat it is there to get rid of excess moisture accumulating from the home. In of vent opening per 150 sq. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.

First determine your attic area by multiplying the length by the width. Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120. Ridge vent must me installed per the manufactures instructions. Homes are naturally filled with warm moist air on a daily basis thanks to human physiology and activities such as cooking and showering.

It can do both. The most popular way to ventilate an attic is to take advantage of buoyancy or warm moist air s natural tendency to rise especially when pushed by cold air beneath it. A 30 x 40 ft. Insulation at least r 38 or more is there for heating and cooling.

To meet all three goals insulating your finished attic ventilating the roof and maximizing headroom use a combination of dense batt insulation rigid foam sheeting and air chutes. Best ventilation is open soffit venting to a open vented ridge vent. These vents allow outside air to enter the attic at the lowest point of the roof along the underside of the eave.