See typical tasks and time to insulate an attic along with per unit costs and material requirements.
Sq ft attic.
1250 cfm weathered wood galvanized steel electric powered attic fan with thermostat controlled.
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.
The cost to insulate an attic starts at 1 68 3 25 per square foot but can vary significantly with site conditions and options.
Based on your 1100 sq.
Get fair costs for your specific project requirements.
For attic spaces up to 2300 sq.
Input length and width of area to be insulated.
Step 5 add together the square footage values of the square rectangular and triangular floor areas to find the total square footage of your attic.
The federal housing administration recommends 1 square foot of attic ventilation for every 150 square feet of attic space.
This calculator is to be used as an estimating tool only.
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Multi family attic insulation.
See professionally prepared estimates for attic insulation work.
Exhaust nfva near ridge of the roof.
Divide the attic s square footage by 150.
If you need 9 000 cfm of air in your house then divide 9 000 by 750 to get 12 square feet of attic venting.
You always need 1 square foot of attic getting out 750 cfm of airflow.
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.
This means you need one attic vent every 3 6 by 3 6 feet.
Thirdly is to measure the size of the attic air vents.
Calculate or enter the square footage of the attic or area to be vented.
The master flow erv5 power roof vent is the master flow erv5 power roof vent is a great overall investment in attic ventilation.
Some cities offer loans with low interest rates if you achieve a 20 25 efficiency improvement in the home to include attic insulation of at least r 38.
For example if the base is 12 feet and the height is 10 feet the square footage is 6 x 10 60 feet.