Flat ICF walls

 Flat ICF walls

Foundation walls made of flat #ICF units need to be not less than the greater of 140 mm (5 1/2 in.) or the thickness of the wall above. Flat ICF walls need to be laterally supported at their tops and bottoms.

Quoted from Illustrated Users' Guide - NBC2015

#foundationwall #ICF

9.15.4. Foundation Walls

 9.15.4. Foundation Walls

Foundation walls are intended to support the loads transferred to them from the building #superstructure, and to safely resist any lateral soil and water pressures acting against them (Figure 9.15.-10). Where #hydrostatic pressure is present, the #foundation wall must be designed according to NBC Part 4.

Reasonably thick #cast-in-place concrete, #masonry foundation walls, and flat #ICF foundation walls are able to withstand the vertical loads from the superstructure of most Part 9 buildings with strength to spare. Both concrete and masonry, however, are relatively weak in tension. They are therefore reinforced with steel if the tensile forces become too great. Since foundation walls for residential and other small buildings are most often unreinforced, the most critical loads they are subjected to are the horizontal loads due to earth pressure.

If #basement walls are supported at the top, tension stresses are created as the walls deflect inward. If the walls are #unsupported at the top, they act as retaining walls, stabilized by the weight of the wall and the vertical superstructure loads. The greater the depth of #backfill, the stronger the foundation wall must be to resist the horizontal forces.

Quoted from Illustrated Users' Guide - NBC2015

#earthpressure #retainingwall #castinplaceconcrete #foundationwalls

9.15.3.4. Basic Footing Widths and Areas

 9.15.3.4. Basic Footing Widths and Areas 

This Article lists the minimum #footings #widths and areas based on anticipated loads. The footing sizes in NBC Table 9.15.3.4. are based on typical construction consisting of a roof, not more than three storeys, and centre bearing walls or beams. For this reason, NBC Clause 9.15.3.3.(1)(b) stipulates a maximum supported #joist span of 4.9 m (16 ft.).

The prescriptive requirements for #house footings are based on the limitations and assumptions depicted in Figure 9.15.-4, and are intended to deal with the majority of situations encountered.

Quoted from Illustrated User's Guide - NBC2015

#footingwidth