Concrete masonry is used to construct various foundation wall types including full basement walls crawlspace walls stem walls and piers.
Nominal thickness irc concrete walls.
Where the unbalanced backfill retained by the stem wall is greater than 18 inches 457 mm the minimum nominal thickness of the wall shall be 6 inches 152 mm.
D no vertical reinforcement required.
The use of this table shall be prohibited for soil classifications not shown.
Masonry foundation walls shall be not bless than the thickness of the wall supported except that masonry foundation walls of at least 8 inch 203 mm nominal thickness shall be permitted under brick veneered frame walls and under 10 inch wide 254 mm cavity walls where the total height of the wall supported including gables is not more than 20 feet 6096 mm provided the requirements of section r404 1 1 are met.
Since its first date of publication the prescriptive minimum wall thickness has been prescribed in terms of an actual minimum.
If the soil class is gp what is the minimum vertical reinforcement required.
7 5 9 5 and 11 5 in.
See table r608 3 for tolerance from nominal thickness permitted for flat walls.
Concrete masonry is well suited for below grade applications because of its strength durability economy and resistance to fire insects and noise.
Minimum vertical reinforcement for 8 10 and 12 inch nominal flat basement walls using 3 gatorbar bfrp basalt fiber reinforced polymer bars applies in seismic categories a b and c only minimum vertical reinforcement for 8 10 and 12 inch nominal flat basement walls.
B 5 at 47 o c.
An 8 foot high flat concrete foundation wall of nominal 10 inch thickness is subjected to 6 feet of unbalanced backfill.
A 4 at 38 o c.
In general poured concrete basement walls that are 8 feet tall or less and have no more than 7 feet of soil pressing against them from the outside function well at a thickness of 8 inches.
C 6 at 43 o c.
R404 1 3 2 2 concrete foundation stem walls supporting light frame above grade walls.
When a taller wall or a higher level of soil or both come into play the thickness should increase to 10 inches.
A plain concrete wall with a minimum nominal thickness of 12 inches is permitted provided minimum specified compressive strength of concrete f c is 3 500 psi.
1 inch 25 4 mm 1 plf 14 6 n m 1 pound per square foot 47 9 n m 2.
