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Re: Roof ventilation in the mountains

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This is a new fire requirement in CA for the Urban Wildlife Interface areas--no soffit venting! The code writers indicated that eyebrow venting would be used instead, AFAIK nobody worried about snow blockage. The Area/300 rule is very old & based on extremely shaky testing, but it has become enshrined & hard to get rid of. Shingle life might be affected in hot locales & condensation is a problem in cold, so non vented spaces can be a problem. Your guy might solve his problem by completely sealing off the roof cavity from moist, interior air &/or completely filling the ceiling cavity with something non pervious to moist air (batt insulation will not do the job). Proper Bathroom & Kitchen venting is important also.
A code compliant solution does not appear to be easy to do.
Chuck Utzman,PE
bruckmandesign(--nospam--at)verizon.net wrote:

Your client may need to install ducted system with a rated fire damper to/from a mechanical ventilation system.

Don


 Sleepers on the rafters, with the space power ventilated?
Jordan

ENGRLAINES(--nospam--at)aol.com wrote: How can a cathedral roof be ventilated in a mountain residencewhen all soffit and fieze blocking openings are prohibited due to firerequirements? Openings on the lower portion of the roof would work butthen you have snow blocking the vents. My client in Arrowhead (SouthernCalifornia) has developed mold in his unventilated cathedral roof so henow wants to ventilate it but can only add vents at the ridge. We beachguys have a hard time dealing with mountains and snow! Charles Laines, S.E. Long Beach, CA******* ****** ******* ******** ******* ******* ******* **** Read list FAQ at: http://www.seaint.org/list_FAQ.asp* * This email was sent to you via Structural Engineers * Association of Southern California (SEAOSC) server. To * subscribe (no fee) or UnSubscribe, please go to:** http://www.seaint.org/sealist1.asp** Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you * send to the list is public domain and may be re-posted * without your permission. Make sure you visit our web * site at: http://www.seaint.org ******* ****** ****** ****** ******* ****** ****** ********

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