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Attic Ventilation Installation Waterville ME

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Innis Well Drilling, LLC
(207) 942-5646
64 14th Street
Bangor, ME
Services
Geothermal Heating/Cooling Systems, Well Drilling, Pump Systems Installation and Repair Service, Filtration Systems Installation, Video Well Inspection, Specialized Services

ELCO Geothermal Heating
(207) 942-4659
311 Perry Rd
Bangor, ME
Services
Geothermal Heating and Cooling, Open & Closed Loop Systems, Pond Loop Systems, Heat Pumps

Gagnon Heating and Air Conditioning, Inc.
(207) 647-8782
14 Seymour Drive
Bridgton, ME
Services
Geo Thermal systems, Solar Thermal, Maintenance, Cost Estimates, Snow Melt, Radiant Heat, HVAC
Membership Organizations
US Green Building Council - Maine Chapter

Alpha Water Systems LLC
(207) 838-3445
591 Anderson road
Sebago, ME
Services
Geothermal Heating Systems, Drilled Wells, Water Filtration and Treatment, Well Pump Service

Alpha Water Systems LLC
(207) 838-3445
591 Anderson road
Sebago, ME
Services
Geothermal Heating Systems, Drilled Wells, Water Filtration and Treatment, Well Pump Service

Maine Solar Energy
(207) 232-6595
142 Presumpscot Street
Portland, ME
Services
Solar electricity, Solar hot water, Estimates and Installation

Jim Godbout Plumbing & Heating, Inc.
(207) 283-1200
48 Elm Street
Biddeford, ME
Services
Geothermal Heating & Cooling, Heat Pumps, Heating Contractors, Heating Specialties, Plumbing Contractors-Residential & Commercial, Solar Energy Equipment & Systems-Dealers

Maine Clean Power
(866) 408-4591
148 Middle St.
Portland, ME
Hours
Monday 9:00AM - 5:00PM
Tuesday 9:00AM - 5:00PM
Wednesday 9:00AM - 5:00PM
Thursday 9:00AM - 5:00PM
Friday 9:00AM - 5:00PM

Revision Energy
(207) 589-4171
91 West Main Street
Liberty, ME
Services
Residential Solar Electricity, Residential Space Heating, Residential Solar Hot Water , Commercial Solar Electricity, Commercial Space Heating, Commercial Solar Hot Water
Membership Organizations
The Green Alliance, Sunpower Premier Dealers, The American Solar Energy Society, Portland Chamber of Commerce, Maine Chapter of the U.S. Green Building Council, Maine Association of Building Efficiency Professionals (MABEP), The Maine Real Estate & Devel

Maine Solar Energy
(207) 232-6595
142 Presumpscot Street
Portland, ME
Services
Solar electricity, Solar hot water, Estimates and Installation

Attic Ventilation Questions and Answers

Attic Ventilation Requirements

What is the proper ratio of ventilation per square foot of roof?


1.5 in per sq. ft. Just make sure that the ventilation is installed so an airway is formed to remove heat through the highest part from the lowest part. Ridge vents and soffit vents work best for this. Also, it is better to have ventilation the entire roof length rather than the 8x12 square vents occasionally in the soffit.

I can't say if it's cost efficient or not, but my attic fan cools the attic a lot. When it's in the 70s outside and the attic fan has not run at all, the attic is too hot to go in. On hot days (80+) it comes on in the early afternoon and runs until about 6:00pm. When it's running I can go into the attic without any problem and it's much cooler.

Another Answer:

The ventilation ratios go according to attic floor size not roof size. You can go as low as 1/300 of the attic floor area (for attics which have a continuous vapor barrier below) to a high of 1.5 in inches x the floor area in feet. So a 1000 sq. feet of attic floor area would require between 480 sq. inches to 1500 sq. inches. That is a huge difference in allowance. I would go with the higher number.
One other thing.. the best system uses ridge vents and soffit vents skipping gable end vents entirely. The number would be split about 50-50 between soffits and ridge.



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