This means for every 150 square feet of attic floor space there should be 1 square foot of net free area.
Best way to vent attic.
In order to facilitate this exchange of warm and cool air the general rule.
Luckily with today s building technology.
Below you ll find the top 7 best ways to cool your attic down.
If you re serious about finding the best way to keep an attic cool this guide has the answers you need.
But before you cut any holes plan the locations of the attic vents.
Whole house fans powered attic fans.
Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic.
Adding attic vents is a simple matter of cutting holes and installing vents.
It can do both.
A 60 40 split is a good sweet spot.
Best ventilation is open soffit venting to a open vented ridge vent.
We ll start with the easiest methods that most homeowners can do and work our way up to the more time consuming diy projects.
Of net free area for every 150 sq.
A depressurized attic can suck conditioned air out of the living space and losing that conditioned air wastes money.
Best way to cool an attic 1.
Attics can be the site for excessive heat build up which can lead to many problems such as increased levels of moisture damage to the structure and roofing materials and a higher energy bill.
We supposedly vent attics to 1 remove moisture and 2 remove heat to lower air conditioning costs and increase roof shingle life.
I suggest you read some of the well written and informative articles by joseph lstiburek founding principal of building science corp for guidance on ventilation and insulation issues.
The code minimum for attic ventilation in the 2012 irc section r806 roof ventilation 1 is as follows.
These fans may be controlled by a switch or a thermostat which detects heat build up in the attic space and automatically exhausts the attic space.
For best results provide between 50 and 75 of the ventilation space at the eaves.
The best way to vent an attic is to reduce the need for venting.
Photos 1 6 show how it s done.
Of attic floor space.
One last thought attic ventilation is not there to get rid of heat it is there to get rid of excess moisture accumulating from the home.
Unbalanced ventilation should be in favor of the lower vents gable and soffit because you don t want to depressurize the attic.
Insulation at least r 38 or more is there for heating and.
Finding the best way to ventilate an attic in your home can become a real thermal nightmare.
More ventilation at the eaves than at the ridge will slightly pressurize the attic.
1 if we airseal the attic ceiling interface well very little moist house air and heat will get into the attic to cause condensation mould.
