MEP-Technical Manual CDN 0408.qxd - Hambro

IMPERIAL
JOIST DEPTH SELECTION TABLES
Concrete: f’ c = 3 000 psi; density = 145 lb./ft. 3
Joist spacing = 4’-2 5/8”
NOTE: Plywood forms have to be slit in half for
any depth.
Slab thickness = 4”
Residential Office Other Loading
Building Building (LL=100 psf)
Dead Load (psf) 79 79 79
Live Load (psf) 40 50 100
Total Load (psf) 119 129 179
SPAN c/c
30’-0”
32’-0”
34’-0”
36’-0”
38’-0”
40’-0” *
42’-0” *
44’-0” *
46’-0” *
48’-0” *
50’-0” *
52’-0” *
LH20 LH20 LH24
min = LH16 min = LH16 min = LH20
LH20 LH24 LH28
min = LH16 min = LH16 min = LH20
LH24 LH28 LH32
min = LH16 min = LH16 min = LH24
LH28 LH32 LH32
min = LH16 min = LH16 min = LH24
LH32 LH32 LH32
min = LH20 min = LH20 min = LH28
LH28 LH32 LH32
min = LH20 min = LH20 min = LH28
LH32 LH32 LH32
min = LH20 min = LH20 min = LH32
LH32 LH32 LH36
min = LH24 min = LH24 min = LH32
LH32 LH36 LH36
min = LH24 min = LH24 min = LH36
LH36 LH36 LH36
min = LH24 min = LH24 min = LH36
LH36 LH36
min = LH24 min = LH24
LH36 LH36
min = LH28 min = LH28
* Permanent line of cross bridging shall be installed at mid-span.
LHXXX
min = LHXXX
: Optimal LH Series Joist Depth (in.)
: Minimum Depth (in.) Allowed
Slab thickness = 4 1/2”
Residential Office Other Loading
Building Building (LL=100 psf)
Dead Load (psf) 84 84 84
Live Load (psf) 40 50 100
Total Load (psf) 124 134 184
SPAN c/c
30’-0”
32’-0”
34’-0”
36’-0”
38’-0”
40’-0” *
42’-0” *
44’-0” *
46’-0” *
48’-0” *
50’-0” *
52’-0” *
LH20 LH20 LH24
min = LH16 min = LH16 min = LH20
LH24 LH24 LH28
min = LH16 min = LH16 min = LH20
LH24 LH28 LH32
min = LH16 min = LH16 min = LH24
LH32 LH32 LH32
min = LH20 min = LH20 min = LH24
LH32 LH32 LH32
min = LH20 min = LH20 min = LH24
LH32 LH32 LH32
min = LH24 min = LH24 min = LH28
LH32 LH32 LH32
min = LH24 min = LH24 min = LH32
LH36 LH36 LH36
min = LH24 min = LH24 min = LH32
LH36 LH32 LH36
min = LH24 min = LH24 min = LH36
LH36 LH36 LH36
min = LH24 min = LH24 min = LH36
LH36 LH36
min = LH28 min = LH28
LH36
min = LH28
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