Roofing (cont., pg7)
Ventilation
Attics must be ventilated. Inflowing air must have a means of exit through the roof. Your roofer will install the ventilation. It is your choice what type of ventilation to use.
Ridge Vents
Openings are cut in the roof decking along the length of the ridge.
The ridge is the horizontal roof line located at the high points of gables and hips.
Hot attic air naturally rises to the highest point and escapes through the ridge vent.
The venting device is nailed over the opening and waterproofed. The vent may be the exposed style, or the style with shingle layover.
Among static (non-powered) forms of ventilation, I consider ridge vents as the best way to go.
I’ve used them for years with good results.
Some roof designs leave minimal length of ridge lines.
That means minimal length of ridge vents which may not be enough to do the job alone. You may need to supplement with powered ventilation. |   |
Powered Roof Vents
Roof-mounted, powered fans do a good job of moving attic air.
They are particularly valuable for roof designs with short ridge lengths.
Powered vent motors will burn out eventually, requiring replacement.
Your building supply representative can use your plan to calculate exactly what your ventilation requirements will be.
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