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Posted by Norminn on March 3, 2007, 12:06 pm
JimR wrote:
>
>>Hello:
>>
>>Will be having a roofing job, and the roofer suggested a "ridge roof vent"
>>be added by him when he
>>does the new shingle installation.
>>
>>Did a Google search on these things, but a bit confused how they work.
>>
>>a. what keeps the rain out if the rain is driven horizontally by a strong
>>wind, which sometimes does happen ?
>> Wouldn't any "horiz" or near horiz. rain get right into the attic ?
>>
>>b. Didn't see any mention of screens for these things. What keeps the
>>bugs and flies out ?
>>
>>c. BTW: do they come in different materials ? If so, what would I want
>>?
>>
>>All in all, a good idea in your opinions ?
>>
>>(what's a typical or reasonable cost for a typical 40' or so length roof
>>line for the item and installation ?)
>>
>>Thanks,
>>Bob
>
> According to the contractor doing my renovation, ridge vents are NOT
> recommended in Florida because they are susceptible to hurricane damage.
> During 2004-5 hurricanes in this area many ridge vents ripped off like
> zippers, which then exposed the roof to more damage. (The contractor doing
> my work is extremely cautious about any openings in the roof, including
> skylights and solotubes, feeling that -- especially during heavy storms --
> they have the potential to become the source of problems, no matter how well
> installed.)
>
>
Well, one alternative is to have no vents. The roof will be hotter and
the roofing will degrade more quickly. Hurricane force winds aren't
that choosy - they will take your shingles, tiles, etc. Our closest
call was 70 mph wind, my maximum tolerable :o) Our 6x15' skylight took
flight, but that was because one end had leaked for years and years and
the wood it had been attached to rotted away. We had a pretty shabby
reroof done in '97, before I lived here, with lots and lots of shingles
falling off due to improper nailing. Two major reworks, and a few other
callbacks resulted in getting glue stuck under all of the flaps of the
shingles - the silver lining to our dark cloud was that the extra
adhesive probably is what kept us from losing a lot more in the
hurricane blow-by. Only lost 3, when most of the surrounding area lost
large amounts, especially on older roofs.
We have a weird roof on our condo, with square vents on top of mansards.
I kept bugging people when it appeared that we were losing more
shingles on the sunny side of the roof. One owner finally took a look
at the vent and found it stuffed with fiberglass, apparently to keep
rats out. That's another story.
If a ridge vent flies off, it was probably fastened with staples.
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