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Ours is a new construction, and we are interested in a technique we saw somewhere regarding angling the lath to allow airflow from the eave edges up through to the ridge vent. Perhaps it was angling the lath strips to be parallel with the valleys, or something like that? We heard that doing this eliminates the need to ventilate the attic. We're in Texas, and it's HOT here, so we'll probably ventilate the attic anyway, but please tell us what you know! Thanks!
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I am not familiar with anything exactly like what you're mentioning.
Ultimately, if the roof has traditional construction with an attic space, the attic can be vented from the soffits to a ridge vent. This can occur beneath the roof decking and subsequent lathe and is ideal for keeping unwanted heat and moisture out of the attic.
If you have a situation where there is no attic space and the roofing material you're installing requires horizontal lathe on top of the roof decking then, yes, it would be good to get some ventilation. In fact, current building codes require at least a 1" vented airspace. I have seen slotted lathe and, of course, the lathe can be gapped some when the lengths are installed. This would get some miniscule airflow but still not nearly enough to really be considered adequate ventilation.
Feel free to write back with more details concerning your exact construction methods.
10/14/2003
10/15/2003