My 3000 sqft, single story, house has screened soffit openings (8"x16") into
the attic, every 15 feet.
However, there is no vent in the roof, at all. The roof is cement tile over
plywood and tarpaper.
I suppose, the design relies on cross ventilation between soffits.
Is this acceptable or should I install additional vents in the roof? (not
I don't do this for a living, but my homeowner discussion with roofing
and inspector types indicates that you really would want to add a
gable vent to this mix, and/or some active device (powered ventilator)
to improve the airflow situation there. Though, all these
discussions have been in the context of asphalt shingle roofs.
Another important thing to verify is that your bath exhaust fans
really do vent out to the roof vs into the attic, for the obvious
Are you sure you don't have a ridge vent? Sometimes
they aren't continuous, and sometimes are hard to
identify unless you look closely.
If no ridge vent, yeah, you need to do some research
and add some venting; there are several alternatives.
I would guess every 15 foot is too little. However since we don't know
how many 8x16 vents you have it is not possible to suggest if that is enough
or not. In any case it looks like you have a lot of inlet, and not outlet.
Which means you have very little effective venting.
In alt.home.repair on Sun, 31 Jul 2005 17:07:07 GMT "Walter R."
I doubt it. If you don't have a thermometer that goes over 1x0
degrees, how early does it reachthat temperature? How hot is it
outside? Maybe you could use an oven thermometer to measure the temp
in the attic, not kidding.
My guess is that it shouldn't be over 125 when it is 95 outside, with
a fan at least. Less if possible.
Do you have gables? Some houses just have roof on four sides, with
mini ridges between the end roofs and long roof parts.
How big are these tiles? Maybe a few could be removed, and then
trimmed and replaced to make a 14?" round hole.
If you end up putting in a fan, you should know that I get a cover of
"lint", mostly natural air-born plant stuff I think, over my soffitt
screens, every ten years or so, and mine are 6 inches wide but
continuous, except for where the joists are. You have much less
soffit venting now, so your lint will accumulate faster in inverse
proportion to mine.
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