foundation workbook
Open Building Institute
foundation workbook
details
6 mil polyethylene vapor barrier
4” of gravel
4” concrete slab
12”
12”
6”
6”
housewrap
foam sill gasket
PT sill plate
2” EPS
2x6 wall
vinyl flashing
vinyl clapboard siding
finished grade
frost protected shallow foundation : slab on grade : detail
SEE QUESTIONS FOR ENGINEER IN THE NEXT TWO PAGES
frost protected shallow foundation : slab on grade : questions for engineer
QUESTION FOR ENGINEER (1 of 2)
Simpson describes several code compliant installation options for their MASA anchors. Our case is actually a combination of 3 of their options: a) we have a double 2x sill; b: we have double studs (every 4 ft); and c) we have 7/16” osb attached to the wall panels.
7/16 osb
double studs
concrete foundation
double sill/bottom plate
OUR CASE
MANUFACTURER RECOMMENDATIONS (click images for link to source)
frost protected shallow foundation : slab on grade : questions for engineer
QUESTION FOR ENGINEER (2 of 2)
Simpson makes two versions of this anchor:
So MASAP seems to be the one we would want for our panelized system, but has 1 major setback: it doesn’t lay flat on the forms (as MASA does). The question is then if we can use the MASA anchors with 2 legs up (instead of the MASAP) and increase the schedule?
6 mil polyethylene vapor barrier
4” of gravel
4” concrete slab
12”
12”
6”
6”
housewrap
foam sill gasket
PT sill plate
2” EPS
2x6 wall
Post-installed concrete anchors
vinyl flashing
vinyl clapboard siding
finished grade
frost protected shallow foundation : slab on grade : detail
QUESTION FOR ENGINEER
Can a 2x6 sill plate (supporting 2x6 walls) overhang the rigid foam insulation 2”?
foam sill gasket
2” EPS
exterior door
vinyl flashing
PT 2x4
PT 1/2” plywood
butyl flashing tape
⅜ x 6 trimboard
(to cover flashing tape)
finish concrete floor
frost protected shallow foundation : slab on grade : door detail
6 mil polyethylene vapor barrier
4” of gravel
4” concrete slab
12”
12”
6”
6”
through-wall
vinyl flashing w/ back dam
concrete anchor
housewrap
foam sill gaskets
2x4 mudsill
2” EPS
2x6 wall
frost protected shallow foundation
6 mil polyethylene vapor barrier
4” of gravel
4” concrete slab
12”
12”
6”
6”
through-wall
flashing w/ back dam, doubles as thermite shield and insulation protection
concrete anchor
housewrap
foam sill gaskets
2x4 mudsill
2” EPS
2x6 wall
frost protected shallow foundation
6 mil polyethylene vapor barrier
4” of gravel
4” concrete slab
12”
12”
6”
6”
through-wall
flashing w/ back dam, doubles as thermite shield and insulation protection
concrete anchor
housewrap
foam sill gaskets
2x4 mudsill
2” EPS
2x6 wall
frost protected shallow foundation
frost protected shallow foundation
6 mil polyethylene vapor barrier
4” of gravel
4” concrete slab
12”
12”
6”
6”
through-wall
flashing w/ back dam, doubles as thermite shield and insulation protection
concrete anchor
housewrap
foam sill gaskets
2x4 mudsill
2” EPS
2x6 wall
6 mil polyethylene vapor barrier
4” concrete slab
foam sill gaskets
concrete anchor
through-wall
flashing w/ back dam, doubles as thermite shield and insulation protection
12”
6”
housewrap
4” of gravel
12”
6”
2” EPS
frost protected shallow foundation
frost protected shallow foundation
uninsulated foundation
6 mil polyethylene vapor barrier
4” concrete slab
foam sill gaskets
concrete anchor
through-wall
flashing w/ back dam
12”
6”
housewrap
4” of gravel
12”
foundation workbook
dimensions
380”
188”
2” rigid insulation
exterior turned-down footing
12” x 18”
4” concrete slab
12”
18”
4”
12”
12”
4”
thickened slab (stairwell)
12” x 12”
72”
132”
48”
½” = 1’
FRONT
frost protected shallow foundation : slab on grade : dimensions
12”
18”
4”
12”
12”
4”
1” = 1’
Footings
foundation workbook
sill plate
½” = 1’
FRONT
frost protected shallow foundation : sill plate
2x6 : 96”
2x6 : 96”
2x6 : 96”
2x6 : 47”
2x6 : 95”
2x6 : 96”
39”
2x6 : 96”
2x6 : 96”
2x6 : 54.5”
2x6 : 52.5”
74”
2x6 : 100.5”
2x6 : 52.5”
39”
Expansion door
foundation workbook
anchors
QUESTION FOR ENGINEER
The IRC requires:
According to this, if we used, for example, 12’ boards for our sill plate, we’d only need 3 anchors per board. However, regardless of the length of our sill plate boards, the bottom plate on our wall modules is usually 48” (some are shorter). The adjacent studs on wall modules are nailed together per the IRC (see IRC section R602.10.4.4 Panel Joints). Does the bottom plate of the modules count as a sill plate for code purposes and does this mean that we need to use 2 anchors per module? Or only the actual sill plate counts (in which case we could use 3 anchors per 12’ board)?
48” wide
wall module
48” wide
wall module
48” wide
wall module
12’ long sill plate
2 anchors per module?
0r 3 anchors per 12’ board?
Adjacent studs of wall modules nailed together
per section R602.10.4.4 of the IRC
technical: foundation
concrete anchors