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1309.0507 SECTION R507, EXTERIOR DECKS.

Subpart 1.

IRC Table R507.3.1.

Table R507.3.1 is modified to read as follows:

TABLE R507.3.1

MINIMUM FOOTING SIZE FOR DECKS

LOAD-BEARING VALUE OF SOILSa, c, d (psf)
1500e 2000e
LIVE LOADb (psf) TRIBUTARY AREA (sq. ft.) Side of a square footing (inches) Diameter of a round footing (inches) Thickness (inches) Side of a square footing (inches) Diameter of a round footing (inches) Thickness (inches)
20 12 14 6 12 14 6
40 14 16 6 12 14 6
60 17 19 6 15 17 6
40 80 20 22 7 17 19 6
100 22 25 8 19 21 6
120 24 27 9 21 23 7
140 26 29 10 22 25 8
160 28 31 11 24 27 9
LOAD-BEARING VALUE OF SOILSa, c, d (psf)
2500e >3000e
LIVE LOADb (psf) TRIBUTARY AREA (sq. ft.) Side of a square footing (inches) Diameter of a round footing (inches) Thickness (inches) Side of a square footing (inches) Diameter of a round footing (inches) Thickness (inches)
20 12 14 6 12 14 6
40 12 14 6 12 14 6
60 13 15 6 12 14 6
40 80 15 17 6 14 16 6
100 17 19 6 15 17 6
120 19 21 6 17 19 6
140 20 23 7 18 21 6
160 21 24 8 20 22 7

For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2, 1 pound per square foot = 0.0479 kPa.

a Interpolation permitted, extrapolation not permitted.

b Live load = 40 psf, dead load = 10 psf.

c Assumes minimum square footing to be 12 inches x 12 inches x 6 inches for a 6 x 6 post.

d If the support is a brick or CMU pier, the footing shall have a minimum 2-inch projection on all sides.

e Area, in square feet, of deck surface supported by post and footings.

Subp. 2.

IRC Table R507.5.

Table R507.5 is amended by modifying footnote "a" to read as follows:

a Live load = 40 psf, dead load = 10 psf, L/∆ = 360 at main span, L/∆ = 180 at cantilever with a 220-pound load applied at the end.

Subp. 3.

IRC Table R507.6.

Table R507.6 is amended by modifying footnotes "b" and "c" to read as follows:

b Live load = 40 psf, dead load = 10 psf, L/∆ = 360.

c Live load = 40 psf, dead load = 10 psf, L/∆ = 360 at main span, L/∆ = 180 at cantilever with a 220-pound point load applied to end.

Subp. 4.

IRC Table 507.9.1.3(1).

Table R507.9.1.3(1) is modified to read as follows:

TABLE R507.9.1.3(1)

DECK LEDGER CONNECTION TO BAND JOISTa

(Deck live load = 40 psf, deck dead load = 10 psf)

JOIST SPAN
CONNECTION DETAILS 6' and less 6'1" to 8' 8'1" to 10' 10'1" to 12' 12'1" to 14' 14'1" to 16' 16'1" to 18'
On-center spacing of fasteners
1/2-inch diameter lag screw with 1/2-inch maximum sheathingb,c 30 23 18 15 13 11 10
1/2-inch diameter bolt with 1/2-inch maximum sheathingc 36 36 34 29 24 21 19
1/2-inch diameter bolt with 1-inch maximum sheathingd 36 36 29 24 21 18 16

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa.

a Ledgers shall be flashed in accordance with Section R703.4 to prevent water from contacting the house band joist.

b The tip of the lag screw shall fully extend beyond the inside face of the band joist.

c Sheathing shall be wood structural panel or solid sawn lumber.

d Sheathing shall be permitted to be wood structural panel, gypsum board, fiberboard, lumber, or foam sheathing. Up to 1/2-inch thickness of stacked washers shall be permitted to substitute for up to 1/2-inch of allowable sheathing thickness where combined with wood structural panel or lumber sheathing.

Statutory Authority:

MS s 326B.02

History:

44 SR 764

Published Electronically:

March 31, 2020

Official Publication of the State of Minnesota
Revisor of Statutes