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Polk County Public Works (Polk County)

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Polk County Public Works
5885 NE 14
th
Street
Des Moines, IA 50313
(515) 286-3352
(515) 286-3437
JOB SITE ADDRESS: ________________________________________
OWNER: ___________________________________________________ PHONE: (_______) ________ - ___________
ADDRESS: ___________________________________________________ CITY: ________________________ STATE: ______ ZIP CODE: _________
EMAIL: ___________________________________________________________________
CONTRACTOR: ____________________________________________ PHONE: (_______) ________-____________
COMPANY: _____________________________________________
ADDRESS: ___________________________________________________ CITY: ________________________ STATE: ______ ZIP CODE: _________
EMAIL: ___________________________________________________________________
Size of proposed deck (dimensions)? _________ X _________ and total square feet ________________________
Is the deck going to be covered? Yes No (If yes, must provide engineered truss specifications)
If yes, what is the height of covered deck from grade to peak? ________________________
Additional Information (if any)
________________________________________________________________________________________________________
Checklist of items to be filled out or completed prior to submitting application packet:
Deck Permit Application and checklist
Detailed Site Plan drawing
Building Spec Sheet for decks
Sta
ked - Proposed building layout staked
Truss Specifications if covered
___________________________________________________
Print Name
___________________________________
Signature Date
Contractor/ Owner/Applicant Statement:
I have included all of the above checked items and I understand that
that all the items listed above must be
reviewed and fees paid before a permit will be issued. I further understand that construction work cannot begin
until the building permit has been issued. All the information supplied by me is true and correct to the best of my
knowledge and belief.
*Please allow 5-7 business days for permit review and approval
Deck, 3 or 4 Season Porch and Covered Patio Permit
Application and Checklist
Permit #
** No construction shall start until the permit is issued.
** All work must be permitted prior to inspections.
** Unresolved zoning, subdivision, floodplain and health items may delay the issuance of any permit.
** No structure should be used or occupied until the Certificate of Occupancy is issued.
** If an electrical or plumbing permit is needed, they must be applied for separately.
PLEASE PRINT
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signature
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Building Spec sheet for decks
Please provide the following information:
Job Address:
Type of Use (Including size):
1. Footings: (42” minimum frost depth)
Depth below grade:
Size of footing or trench:
Size and type of reinforcement:
2. Floor framing: (list size and grade of lumber)
Size of support beam(s):
Spacing of support beam posts:
Size, span and spacing of floor joist:
Type of floor sheathing:
3. Roof and ceiling: (List size and grade of lumber)
Size, span and spacing of ceiling joists:
Size, span and spacing of roof rafters:
Truss rafters: Must provide design data from manufacturer
Comments/ Additional Information
Questions or to schedule inspections after the permit is issued 286-3352
Polk County Public Works – Detailed Site Plan Drawing
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signature
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Residential Deck Information
DECK LEDGER CONNECTION TO BAND JOIST
a, b
(Deck live load = 40
psf, deck dead load = 10 psf, snow load ≤ 40 psf)
CONNECTION DETAILS
JOIST SPAN
6' and
less
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 sheathing
c, d
30
18
15
13
11
10
1
/
2
-inch diameter bolt with
1
/
2
-inch
maximum sheathing
d
36 36
34
29 24 21 19
1
/
2
-inch diameter bolt with 1-inch
maximum sheathing
e
36 36
29
24 21 18 16
a. Ledgers shall be flashed in accordance with Section R703.4 to prevent water from contacting the
house band joist.
b. Deck Ledger shall be 2x8 (No. 2 grade or better Pressure Treated Southern Pine, Hem-Fir or other
approved material)
c. The tip of the lag screw shall fully extend beyond the inside face of the band joist.
d. Sheathing shall be wood structural panel or solid sawn lumber.
PLACEMENT OF LAG SCREWS AND BOLTS IN DECK LEDGERS AND
BAND JOISTS
MINIMUM END AND EDGE DISTANCES AND SPACING BETWEEN ROWS
TOP EDGE
BOTTOM EDGE
ENDS
ROW SPACING
Ledger
a
2 inches
d
3
/
4
inch
2 inches
b
1
5
/
8
inches
b
Band Joist
c
3
/
4
inch
2 inches
2 inches
b
1
5
/
8
inches
b
a. Lag screws or bolts shall be staggered from the top to the bottom along the horizontal run of the
deck ledger in accordance with Figure R507.2.1(1).
b. Maximum 5 inches.
c. For engineered rim joists, the manufacturer's recommendations shall govern.
d. The minimum distance from bottom row of lag screws or bolts to the top edge of the ledger shall
be in accordance with Figure R507.2.1(1).
PLACEMENT OF LAG SCREWS AND BOLTS IN LEDGERS
PLACEMENT OF LAG SCREWS AND BOLTS IN BAND JOISTS
DECK ATTACHMENT FOR LATERAL LOADS
OR
MAXIMUM JOIST SPACING
MATERIAL TYPE AND
NOMINAL SIZE
MAXIMUM ON-CENTER JOIST SPACING
Perpendicular to joist
Diagonal to joist
a
1
1
/
4
-inch-thick wood
16 inches
12 inches
2-inch-thick wood
24 inches
16 inches
Plastic composite
In accordance with
Section R507.3
In accordance with
Section R507.3
DECK JOIST SPANS FOR COMMON LUMBER SPECIES (ft. - in.)
SPECIES
a
SIZE
SPACING OF DECK
JOISTS WITH NO
CANTILEVER
bf
(inches)
SPACING OF DECK
JOISTS WITH
CANTILEVERS
c
(inches)
12
16
24
12
16
24
Southern pine
2 × 6
9-11
9-0
7-7
6-8
6-8
6-8
2 × 8
13-1
11-10
9-8
10-1
10-1
9-8
2 ×10
16-2
14-0
11-5
14-6
14-0
11-5
2 ×12
18-0
16-6
13-6
18-0
16-6
13-6
Douglas fir
-
larch
d
, hem-fir
d
spruce
-pine-fir
d
2 × 6
9-6
8-8
7-2
6-3
6-3
6-3
2 × 8
12-6
11-1
9-1
9-5
9-5
9-1
2 × 10
15-8
13-7
11-1
13-7
13-7
11-1
2 × 12
18-0
15-9
12-10
18-0
15-9
12-10
Redwood,
western cedars,
ponderosa pine
e
,
red pine
e
2 × 6
8-10
8-0
7-0
5-7
5-7
5-7
2 × 8
11-8
10-7
8-8
8-6
8-6
8-6
2 × 10
14-11
13-0
10-7
12-3
12-3
10-7
2 × 12
17-5
15-1
12-4
16-5
15-1
12-4
a. Cantilevered spans of 2 ft maximum are permitted
b. No. 2 Grade with wet service factor
TYPICAL DECK JOIST SPANS
*
Max 2 ft cantilever
DECK BEAM SPAN LENGTHS
a, b
(ft. - in.)
SPECIES
c
SIZE
d
DECK JOIST SPAN LESS THAN OR EQUAL TO:
(feet)
6
8
10
12
14
16
18
Southern pine
2 ‒ 2 × 6
6-11
5-11
5-4
4-10
4-6
4-3
4-0
2 ‒ 2 × 8
8-9
7-7
6-9
6-2
5-9
5-4
5-0
2 ‒ 2 × 10
10-4
9-0
8-0
7-4
6-9
6-4
6-0
2 ‒ 2 × 12
12-2
10-7
9-5
8-7
8-0
7-6
7-0
3 ‒ 2 × 6
8-2
7-5
6-8
6-1
5-8
5-3
5-0
3 ‒ 2 × 8
10-10
9-6
8-6
7-9
7-2
6-8
6-4
3 ‒ 2 × 10
13-0
11-3
10-0
9-2
8-6
7-11
7-6
3 ‒ 2 × 12
15-3
13-3
11-10
10-9
10-0
9-4
8-10
Douglas fir
-larch
e
,
hem
-fir
e
,
spruce
-pine-fir
e
,
redwood,
western cedars,
ponderosa pine
f
,
red pine
f
3 × 6 or 2 ‒ 2 x 6
5-5
4-8
4-2
3-10
3-6
3-1
2-9
3 × 8 or 2 ‒ 2 × 8
6-10
5-11
5-4
4-10
4-6
4-1
3-8
3 × 10 or 2 ‒ 2 × 10
8-4
7-3
6-6
5-11
5-6
5-1
4-8
3 × 12 or 2 ‒ 2 × 12
9-8
8-5
7-6
6-10
6-4
5-11
5-7
4 × 6
6-5
5-6
4-11
4-6
4-2
3-11
3-8
4 × 8
8-5
7-3
6-6
5-11
5-6
5-2
4-10
4 × 10
9-11
8-7
7-8
7-0
6-6
6-1
5-8
4 × 12
11-5
9-11
8-10
8-1
7-6
7-0
6-7
3 ‒ 2 × 6
7-4
6-8
6-0
5-6
5-1
4-9
4-6
3 ‒ 2 × 8
9-8
8-6
7-7
6-11
6-5
6-0
5-8
3 ‒ 2 × 10
12-0
10-5
9-4
8-6
7-10
7-4
6-11
3 ‒ 2 × 12
13-11
12-1
10-9
9-10
9-1
8-6
8-1
a. Beam depth shall be greater than or equal to depth of joists with a flush beam condition.
b. Beams supporting deck joists from one side only.
c. No. 2 Grade wet service factor
TYPICAL DECK BEAM SPANS
*Max 2 ft cantilever
DECK BEAM TO DECK POST
DECK POST HEIGHT
a
DECK POST
SIZE
MAXIMUM HEIGHT
a
4 × 4
8'
4 × 6
8'
6 × 6
14'
a. measured from underside of beam
FOOTING CHART
Pier Diameter Sq. Ft. of deck that can be supported
12” ≤32
14” 40
16” 56
18” 72
20” 88
22” 104
24” 126
FOOTINGS AND ATTACHMENTS
Guard, Handrail & Stair Details
General Handrail Requirements
Handrails shall return or terminate in newel posts,
safety terminals or wall.
Handrails shall not
encroach into the stair
width more than 4 1/2".
GLAZING ADJACENT TO STAIRS & WALKING SURFACE
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Completed 14 February 2021

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