SOLAR ROOF VENTILATION...
The Green Way to lower
monthly energy bills and cut your cooling costs....
PO Box 8 Kailua Kona,
Click here to print your Solar FEDERAL
Custom Construction Specialties, Inc.
By installing solar attic fans on your roof, you will:
•Prevent hot attic air transfered to your home. Thereby maintaining a cooler temperature in your home and/or reducing your airconditing costs. Extend your roof’s life – by reducing moisture and heat build up and reducing mold and mildew growth in your attic. •Cut air conditioning costs – it will lower attic temperatures by as much 50 degrees Environmentally friendly – solar attic fans are powered by the sun, runs without electricity!
Book a Free Consultation for Solar Vent Installation
Cool off your home by 10 degrees by adding solar roof ventilation.
The most cost effective way to bring your house up to current building codes it to use a solar roof vent in conjunction with extra metal or plastic roof vents. Then, change your soffit vents to one that allows adequate airflow.
Current state and federal tax credits will pay for about 65% of this roof ventilation system because it is considered solar roof ventilation. This is due to the solar roof vents were added even though only a portion of the roof ventilation system was solar.
Keeping your attic cooler in the summer can increase the life of the roof as well as saving money on your air conditioning bill. To effectively cool the attic, outside air needs to circulate through it. One solution is to bring fresh air into the attic through soffit vents under the eaves.
Q: Why would I want to cool off my attic?
A: As we all know, living in Hawaii is living with the sun’s powerful rays almost 365 a year. As the sun radiates heat onto your roof, your roof’s shingles or tiles become very hot. This heat is transferred through the roof and in turn heats up in the air inside your attic. If the hot air stays inside your attic, the heat from this air will eventually enter your home.
While attic insulation slows this process, it does not eliminate the heat transfer process entirely. If your attic is not very well insulated, it will do very little to stop the heat from getting through. Additionally, a hot attic stays hot long after the sun goes down, so the process of heat transfer into your home never really ends.
By removing the hot air from your attic, the process of heat transfer into your home is minimized. The less attic heat is transfer into your home, the cooler it will be. If you have air conditioning, your air conditioner will need to work as hard, thereby saving electricity and further extending the life of your air conditioning system.
Q : What is a solar powered attic vent?
A : It is an attic ventilation fan which runs solely off solar power. These ventilators fall into the category of active attic ventilation, where outside air is forced through the attic and the vent to effectively cool the attic space. This method is many times more effective than natural
ventilation since the air inside the attic is exchanged more times per hour with a powered vent than a passive vent.
Attic temperatures in poorly ventilated attics can soar to 160 degree Fahrenheit. Attic ventilation awareness is at an all time high. This awareness, is a result of the energy savings breakthroughs the home building industry has and continues to experience. Your house, when it was built, probably did not have adequate ventilation. The building codes for roof ventilation in Hawaii are not enforced when your house was built.
Ventilating an attic needs to be done on a continual basis. The temperature and humidity of the air inside your attic needs to be as close as possible to the air on the other side of your roof. Wide differences in either of these numbers can cost you money in repairs or higher cooling bills. Poor attic ventilation in warmer climates generally keep your attic about 20 degrees warmer that it could be with a properly vented roof. This 20 degree elevated temperature in your attic radiates through the ceiling and warms your house. This trapped heat continues to elevate the interior temperature of your house for hours after the outside temperature has become comfortable.
Other problems from inadequate roof ventilation are where the wood sheetings on your roof delaminates, rotted to the point where you can put your foot right through it. In order for your roof ventilation system to work properly, it is important to have adequate roof and soffit ventilation. Current building codes call for a minimum of one square foot of roof ventilation per six hundred square feet of living area. The ventilation of the soffits mouse also matches this. Most plastic and metal roof vents have about 1/2 square foot of ventilation. That means on a 2000ft sq house the minimum ventilation required is seven roof vents and 150 soffit vents if they are a 2 inch diameter round hole. Some aluminum soffit vents restrict the airflow through the hole.
The general rule of thumb on the amount of total attic vent space needed is to have at least one square foot of vent space for every 300 square feet of attic area. 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 to allow for natural circulation of air through the attic.
To find out how much rooft ventalation you need to install:
• Multiply the length of the attic times the width in feet to find the attic area, and then divide by 300 to find the total square feet of vent space needed. [(length x width of attic in feet) ÷ 300 = total sq. ft. vent area]
Example: a 50′ x 60′ attic would have a total area of 3,000 sq. ft., divided by 300 equals 10 sq. ft. of total vent space needed.
•This means that half of the ventalation is at the soffit and the other half is at the ridge
Example: 10 sq. ft. vent area ÷ 2 = 5 sq. ft. soffit vent area and 5 sq. ft, at rhe ridge.
•Calculate the area of each vent: When known, use the “net free area” supplied by the manufacturer of the venting you will be using, which takes into account the actual open area of the vent rather than the total vent size. Multiply the length times width of the vent space in inches, then divide by 144 to convert into sq. ft. [(l x w in inches) ÷ 144 = area of vent in sq. ft.]
Example: a 6″ x 12″ vent would equal 72 sq. in., divided by 144 equals an area of 0.5 sq. ft. per vent.
•Determine the number of soffit vents needed: Divide the total soffit vent area by the area of each vent. [Soffit vent area in sq. ft. ÷ individual vent area in sq. ft. = number of vents needed].
Example: 5 sq. ft. soffit vent area divided by 0.5 sq. ft. vent area equals 10 soffit vents needed
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Current rebates will pay for 2/3 of all your costs!!!