Garage Foundations

Foundations for garages are usually concrete or masonry, although concrete slab-on-grade or preserved wood foundations are also used. The minimum depth below grade for a garage foundation attached to a house should not be less than that shown in Table 3.

If fill is required below the floor, a granular material is preferable and should be well compacted to avoid settlement after the floor is laid. With a base of 6 in. (150 mm) of crushed stone or gravel, the concrete floor should be at least 3 in. (75 mm) thick. Unless a floor drain is installed, the floor should be sloped toward the entrance.

Detailing, placing and curing of concrete garage floors should be carried out as described for basement floor slabs. Control joints should be used to produce panels as nearly square as possible. For a single car garage, one control joint should be sufficient.

The foundation walls should not be less than 6 in. (150 mm) thick and should extend at least 6 in. (150 mm) above grade.

Sill plates should be anchored to the foundation wall or slab with anchor bolts spaced about 8 ft. (2.4 m) apart and with at least two bolts in each sill piece. Extra anchors may be required at the side of the main door.

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