How Many Attic Rafter Vents Do I Need

After you obtain the vent space you can easily determine the number of rafter vents you need by dividing the total vent space by two vent space 2.

How many attic rafter vents do i need.

Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator. Rafter vents or insulation baffles install in any rafter space to create narrow gaps that direct fresh air from the soffit vents to the peak of the roof. Calculate how many rafter vents you need. Measure the length and width of the house in feet.

The attic has about 9 10 inches of loose fill fiberglass giving r 25 and was not air sealed. Can you help me please your quick response will be greatly appreciated. Rafter vents ensure the soffit vents are clear and there is a channel for outside air to move into the attic at the soffits and out through the gable or ridge vent. These specialty vents do not affect the.

Once you have them you can readily install them by yourself. Without baffles you must keep vents clear of insulation which means. Installing baffles from a soffit vent and up the rafter bay allows you to insulate every available inch of attic floor space. Multiply those two numbers and then divide by 150 to get the vent space square footage.

To install the rafter vents staple them directly to the roof decking. The contractor is coming tomorrow 7 22 10 to install soffit vents and i need to determine how many vents using 8 x 16 vents do i actually need. Rafter vents come in 4 foot lengths and 14 1 2 and 22 1 2 inch widths for different rafter spacings. Attic rafter vent baffles are essential for the health of your roof.

I spent a few days air sealing all penetrations and top plates in the attic and noticed we have soffit baffles in every other rafter bay. The dormers are about 6 w x 5 d. The problem is getting behind the tub and blocking attic space from living space that area should be separated i m surprised that even passed inspection. Roofing resources during covid 19 for contractors for homeowners.

With this figure you will be able to obtain the right number of rafter vents for your attic. Soffit vents are the small metal or plastic grates you probably have seen under the eaves of houses. To block the vent is not a problem all you have to do is get a 2 x2 x1 4 quot. Plus i may need to place 2 vents on each of the dormers.