How Many Attic Rafter Vents Do I Need

Piece of white laminate they sell them at any box store cut to size and put in the back of the vent.

How many attic rafter vents do i need. Calculate how many rafter vents you need. Attic rafter vent baffles are essential for the health of your roof. To block the vent is not a problem all you have to do is get a 2 x2 x1 4 quot. 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.

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. The attic has about 9 10 inches of loose fill fiberglass giving r 25 and was not air sealed. Installing baffles from a soffit vent and up the rafter bay allows you to insulate every available inch of attic floor space. 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.

Once you have them you can readily install them by yourself. With this figure you will be able to obtain the right number of rafter vents for your attic. Multiply those two numbers and then divide by 150 to get the vent space square footage. Plus i may need to place 2 vents on each of the dormers.

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. Soffit vents are the small metal or plastic grates you probably have seen under the eaves of houses. 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 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.

To install the rafter vents staple them directly to the roof decking. Without baffles you must keep vents clear of insulation which means. Measure the length and width of the house in feet. Rafter vents come in 4 foot lengths and 14 1 2 and 22 1 2 inch widths for different rafter spacings.

Roofing resources during covid 19 for contractors for homeowners. Can you help me please your quick response will be greatly appreciated. These specialty vents do not affect the. They allow the fresh air to travel up under the roof to the ridge or gable vents keeping the roofing materials dried out and in good working order.