Quote:
Originally Posted by Heytubes
I was in the business for over 25 years. First off, as for a fire, no real difference is made. One of the things that must be done is that the ridge vents should be blocked as the fan will draw negative air flow from them. The principle is to bring the cooler air from your eave vents to displace the hot attic air. You don’t want to draw air from the ridge vents. Furthermore, the only ridge vent that is effective is made by Air Vent. The others, in my experience are not near as effective as Air Vent. One other plus to proper ventilation of your attic, is to realize that all shingle manufacturers have a disclaimer on the warranty that if your attic is not properly ventilated your warranty is void. Thus, a 25 or 30 year shingle warranty without proper ventilation may only get you 15 or 20 years of life. One last benefit of solar powered units: most have a 25 year warranty and come with a 26 to 30% Federal Tax Credit without conditions.
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Here in Florida, once the roof gets to be 10 years old, it's basically unisurable. So 30 years versus 20 years of roof life, makes no difference.