Part of code and good practice is to have air vents supplying fresh and movable air to the crawl space under the house. We have a raised foundation and thus a crawl space underneath. Our approved plans show vents, but these plans assumed the vents would be installed at the cripple wall around the house. The North-East side of the house has no cripple wall and now we have a problem. The structural plans indicate 12 inch center to center floor joists and foundation vents are standard 16 inch. Additionally, our title-24 plans indicate R-30 insulation at the floor which amounts to 10 inches of batt insulation (floor joist are 12 inch in depth). 

So a standard vent (14’x4″) hole would expose both the insulation and floor joist to the elements. So we have an issue to resolve that isn’t detailed in plan. I don’t like these kinds of situations.

California Building Code, Part 2, Volume 1, CHAPTER 12 – INTERIOR ENVIRONMENT

1203.4.1.1 states we need to have 1.5 sq feet of venting per 25 linear feet of exterior surface.

On the North-East side we have about 40’8″ of exterior wall (or 40.7 feet).
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So we need 2.442 square-feet of venting, lets round up to 2.5 sq-ft.

A 10″ x 3 1/4″ duct work results in 0.226 sq-ft.

It would take 10 holes…. 🙁