Originally Posted by seaton
I have found myself in a wierd situation. I am building a cabin, and the county adopted this new Wildlife Urban Interface. One of the things that it specifies is that I can't have soffits. My roof is TJ's (heavy snow load) stick framed up to a glue lam beam. I am confused if I can't vent the soffits, then how the heck does a person not root out the roof ?
Chapter 5 of the International Wildland-Urban Interface Code
requires soffits and eaves to be constructed for 1-hour fire protection.
This is no different than for any residential structure that gets built within 5 feet of the property line or another detached structure on the same lot.
The goal is to limit fire spreading from one structure to another, or in this case, from the habitat to the structure.
The IWUIC does not restrict one from having soffits. It resticts one from having vented
Attic ventilation need not to occur through eaves or soffits, however.
The International Residential Code
, which your jurisdiction also likley has adopted, simply requires a minimum of 1 sf of ventilation for every 150 sf of attic floor space....and that the roof area be 'cross' ventilated.
Gable vents can meet this ventilation goal without requiring vented soffits as can roof or 'mushroom' type vents placed on the roof downhill low close to the eaves and uphill high near the ridge.
Both methods will meet the IWUIC requirements to prevent fire from being vacuumed up through vented soffits while allowing your attic area to be properly ventilated.