Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.
Metal roof ventilation requirements.
Roof vents choose one of the following products to meet the recommended exhaust nfva of 528 square inches.
Mesh roll ridge vent in black nail gun version when installed as part of a properly balanced when installed as part of a properly balanced attic ventilation system gaf cobra exhaust vent is a shingle over exhaust vent installed at the roof ridge that helps exhaust excess heat and moisture from your attic.
Roof ventilation depends on the simple scientific fact that hot air rises.
Most building codes require a ratio of 1 150 ventilation space to attic floor space.
According to their requirements you should have 1 square foot of attic ventilation per 300 sq ft of attic floor space.
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.
If your roof is 1200 sq ft soffit floor space you will need 4 sq feet of roof ventilation.
Ventsure 4 foot strip heat moisture ridge vent 27 lineal feet required.
Hot air beneath the metal needs an escape route near the top of the roof and intake vents at the bottom of the roof.
Cobra exhaust vent 10 5 in.
Ventilation helps wto avoid the inefficient and potentially unhealthy accumulation of heat and moisture in your attic and living space.
A metal roof typically does not increase nor decrease the need for ventilation.
To protect their investment it is key that your customers ensure the proper ventilation system is installed.
Selecting metal roof and wall panels is a strategic investment for the life of a building.
We do need to mention though one very rare scenario we have seen just a couple of times over our 35 years.
It comes on an easy to install flexible mesh.
Metal roofing neither increases nor decreases the need for ventilation.
The breathing of a metal roof if any is determined by the exact product chosen and its method of installation.
Optimal air movement not only promotes temperature regulation and energy efficiency but also reduces the risk of moisture related issues like condensation build up.
There should also be a 50 50 balance of attic venting and roof venting.
Ventilation that meets code requirements is adequate for any type of roofing material including metal.
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.
