Foundation Wall And Joist Connection

The two general types of floor joist construction used over the foundation wall conform either to platform or balloon-frame construction. Platform framing is by far the most common type used. In platform framing, two methods of wall and joist connection are used and are generally referred to as the sill-plate method and the joist-embedded method.

Sill-Plate Method

This method can be used with either concrete or concrete block foundation walls. It consists of a wood sill plate anchored to the foundation wall (Fig.

34) for the support and fastening of the joists and header at the ends of the joists. The sill plate is usually supported on the top of the foundation wall. In this case, the bottom of the sill plate should be at least 6 in. (150 mm) above the finished grade.

Where it is desirable to lower the elevation of the main floor, the top of concrete foundation walls may be reduced to 3 1/2 in. (90 mm) in thickness. If siding or stucco is used as an exterior finish, the wall framing is supported on a sill plate anchored to the top of the wall, and the floor joists rest on a separate sill plate located on a ledge formed in the wall (Fig. 35). Where a masonry finish is used, such as brick veneer, the masonry is supported on the top of the founda-

Sill-plate method used in platform construction.

o bottom wall plate subfloor floor joist header anchored sill plate foam gasket or mortar

8" (200 mm) minimum for stucco and wood exteriors 6" (150 mm) minimum for other finished grade

Concrete Filler Joist Floor

tion wall,_ and the wall framing is supported on the floor framing (Fig. 36). If the thickness of the wall is reduced, as noted above, the height of the reduced section should not exceed 14 in. (350 mm).

Joist-embedded Method

This method can be used only with cast-in-place concrete foundation walls. Beams, joists and headers are positioned before the concrete is placed. Floor framing is temporarily supported on the inside concrete form and wedges used to level the framing. Filler pieces placed between the floor joists and along the end walls retain the fluid concrete between the joists. These filler pieces are set flush with the inner face of the foundation wall (Fig. 37). joist headers and end joists serve as outside forms for the concrete. Beam ends are treated to prevent decay when they are located at or below grade. The concrete is then placed so that at least two-thirds of the depth of each joist is embedded in the concrete, thus providing suitable

Floor joists supported on a ledge formed in the foundation wall. Joists are toenailed to header and sill plate. Sill plate is anchored to top of foundation wall with anchor bolts. Wall plate supporting the wall framing is fastened to the sill plate with 3 in. (76 mm) nails spaced 16 in. (400 mm) on centre.

wall finish vapour barrier insulation wall stud wall sheathing sheathing membrane wood siding wall plate

8" (200 mm) minimum bottom sill plate anchored to foundation

Floor joists supported on a ledge formed in the foundation wall. Joists are toenailed to header and sill plate. Sill plate is anchored to top of foundation wall with anchor bolts. Wall plate supporting the wall framing is fastened to the sill plate with 3 in. (76 mm) nails spaced 16 in. (400 mm) on centre.

wall finish vapour barrier insulation wall stud wall sheathing sheathing membrane wood siding wall plate

8" (200 mm) minimum bottom sill plate anchored to foundation

Continuous Header

baseboard finish flooring subfloor and undferlay floor joist toe-nailed to sill plate continuous header baseboard finish flooring subfloor and undferlay w floor joist toe-nailed to sill plate continuous header sill plate anchored to foundation s!z" (12 mm) air space if untreated

Floor joists are supported on ledge formed in foundation wall. Joists are toenailed to header and sill plate. Masonry veneer supported on top of foundation wall. Wall framing supported on top of the subfloor.

wall finish vapour barrier insulation wall stud wall sheathing sheathing membrane brick veneer base flashing

6" (200 mm) minimum

V2" (12 mm) air space if untreated

6" (200 mm) minimum

V2" (12 mm) air space if untreated

Wall Sill Plate Flashing

baseboard finish flooring subfloor and underlay floor joist toe-nailed to sill plate continuous header sill plate anchored to foundation anchor bolt baseboard finish flooring subfloor and underlay floor joist toe-nailed to sill plate damproof course under sill when less than 6" (150 mm) above finished grade continuous header sill plate anchored to foundation anchor bolt

Floor joists embedded in the top of the foundation wall.

Embedded Plate Concrete

end joist header floor joist concrete foundation end joist header floor joist concrete foundation

Masonry support using joist-embedded method of floor framing.

brick veneer header sheathing membrane lapped over flashing metal flashing floor joist concrete foundation brick veneer header sheathing membrane lapped over flashing metal flashing floor joist concrete foundation

Floor Joist Concrete
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Responses

  • camilla dellucci
    Can sill plate be the toe plate for a wall?
    6 years ago
  • Rhonda Garnica
    How to anchor joists to concrete block walls?
    6 years ago
  • jean
    Can you land floor joists on top of a footing projection?
    6 months ago
  • Adone
    How to anchor a subfloor to a concrete foundation?
    5 months ago
  • Billy
    How to tie in floor joists to the foundation?
    4 months ago
  • MEBRAT
    How do floor joists sit on concrete foundation wall?
    2 months ago
  • LOUIE
    What do they call the conrete between joists on a foundation wall?
    2 months ago
  • ghenet afwerki
    What do the call the metal going through center of a concrete joist.?
    18 days ago

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