Good ventilation allows the heat and moisture to escape.
Design attic ventilation.
This means for every 150 square feet of attic floor space there should be 1 square foot of net free area.
See the benefits of attic ventilation a new roof is more than just shingles.
Most effective ventilation uses a ridge and soffit continuous ventilation system but even these designs can vary from roof to roof.
The installation of roof vents is a crucial part of roof design because it allows for proper attic ventilation which may help prevent condensation and early aging of your roofing materials.
Prior to installing the ridge vent a 1 inch wide strip of roof decking is cut out along both sides of the ridgeline to allow for air movement through the vent.
Roof ventilation choices design specifications.
A ridge vent is a ventilation strip that is placed along the ridgeline of the home.
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.
In the summer good attic ventilation reduces heat buildup.
Of attic floor space.
Intake vents located at the lowest part of the roof under the eaves allow cool.
In the winter warm moist air seeps into the attic from the living space below.
These attic or roof ventilation recommendations are based on a survey of building science literature combined with 40 years of building inspections on the observation of the locations of moisture mold ice dams condensation stains and other clues in buildings and on the correlation of.
That keeps your attic dry and reduces ice dams.
That cuts cooling costs and prolongs shingle life.
If you don t know how your roof vents work or if you re unsure about your attic ventilation in general you should talk to a roof inspector about your current system and any inherent weaknesses that may be at.
Advantages of proper roofing ventilation.
Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof.
Of net free area for every 150 sq.
Unvented design unvented attic design falls into two categories.
The code minimum for attic ventilation in the 2012 irc section r806 roof ventilation 1 is as follows.
With vented attic assemblies moisture that diffuses into the attic space from the conditioned space is vented to the exterior by attic ventilation.
Systems where condensing surface temperatures are not controlled figure 4 and systems where condensing surface temperatures are.
