Ok so now we know the square footage of the attic area to be ventilated.
Attic venting for 1500 sq ft.
See professionally prepared estimates for attic insulation work.
In order to facilitate this exchange of warm and cool air the general rule of thumb suggests installing at least 1 sq.
I took the 1921 sq ft.
See typical tasks and time to insulate an attic along with per unit costs and material requirements.
6 measure the radius of round vents or take half the diameter of the.
Ft you divide that by 150 to get 10 sq.
Attic area in square feet.
The erv6 model power roof mount vent can move air at a rate of up to 1500 cu.
Get fair costs for your specific project requirements.
Of area which gave me 12 8 or 13 sq ft.
Divided by 150 sq ft.
The cost to insulate an attic starts at 1 68 3 25 per square foot but can vary significantly with site conditions and options.
This in turn can help save money on your heating and cooling costs.
Remember the minimum area requirement when using a continuous system is a ratio of 1 300.
Ventilation area in square feet.
The rule of thumb on the amount of vent space needed is approximately 1 sq.
1 500 square feet.
Of soffit vent area.
Of vent for every 300 sq.
Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space.
Based on your 1100 sq.
Take the 13 sq ft and divide by 2 which gives you 6 5 sq ft.
Net free area in square inches.
For example a 6 by 12 inch soffit vent has 72 square inches which when divided by 144 results in a 0 5 square foot opening.
It is designed for attic spaces up to 2800 sq.
It can efficiently remove a larger volume of hot and or humid air from your attic when compared to static ventilation.
Building codes vary.
Calculate or enter the square footage of the attic or area to be vented.
I m in california so the code equires 1 sq ft.
So if your attic is 1 500 sq.
Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge.
30 feet x 50 feet 1 500 square feet.
Ideally half the vents should be located in the soffit at the bottom of the roof and half in gable or ridge vents near the top.
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.
Of vent space for every 150 sq.
Now let s figure out how much ventilation space we need.