Vented siding section drawing: Cedar shingles above fiber cement; over exterior foam
The main differences between the details pictured here and the ones in the wall we built in the Project House garage shop are in the belly band and the drainage behind the shingles. We stuck with furring strips, which we ran in a cross-hatch pattern.
This drawing shows a drainage mat. Maybe we’ll try the drainage mat on subsequent walls.
—————————————————-
PROJECT HOUSE LINKS:
| HOME | BLOG | GALLERY | DETAILS | Q&A |
—————————————————-
This wall section from Green Building Advisor was the basis of our front wall design for the garage shop. Download this detail
View Comments
Interesting. You're showing the OSB plywood, which we're typically using here (CA) to create structural shear values, with a 1-1/2" layer of insulation between it and the studs. Does that require 20d nails to replace the 8ds for engineering value? How is the engineer with that connection now that the foam has to be considered a part of the engineered wall?
The drawing also appears to show the rim joist bearing on nothing but the foam insulation board. No blocking or squash blocks; and no connectors shown to provide a continuous load path for wind uplift, either. If the 2nd floor wall is supporting a roof load, the engineer and the building inspector won't be likely to accept these details.
Bredian,
No, the OSB is for nail backing for the shingles. Sheer strength is provided with strategically-places sheer panels and/or diagonal bracing.
See the Energy Smart Details article in issue #220, or online here: https://www.finehomebuilding.com/design/departments/energy-smart-details/4-options-for-shear-bracing-foam-sheathed-walls.aspx for more information on that.
iMarc, The floor assembly is bearing on the 2x6 wall. This is no different from a cantilever, except that the cantilever is 1-1/2 in. The rim joist is nailed into the floor joists, as usual.
There are also blocks between the floor joists that align with the inside of the exterior 2x6 wall.
If you live in a high-wind zone, then hurricane clips would need to be added to any assembly.
Thanks for the comments,
Dan