tc figure 20 deck construction - thurston county · p.t. deck beam min 8d at 6" o.c. p.t. 2x...

Thurston County Resource Stewardship Department 2000 Lakeridge Dr SW; Olympia, WA 98502 Phone: (360) 786-5490; TDD: (360) 754-2933

FAX (360) 754-2939 Website: www.co.thurston.wa.us/permitting

12’−0" MAX

12’−

0" M

AX

1 2

3

2x RIM

P.T. 2x LEDGER

FLASHING

FASTENERS USED IN P.T. WOOD MUST BE AS SPECIFIED BY WOOD MFR

1/2"x5" LAG SCREWS w/ WASHER (*), 2” FROM BOTTOM OR TOPOF DECK LEDGER AND2”-5” FROM ENDSSTAGGERED ALONGLEDGER

P.T. 2x DECK JOIST

6" MIN CONC PAD BELOW POST

3’−6" MIN x 18" DIA HOLE. BACKFILL WITH CONCRETE

P.T. 6x6 POST

METAL POST CAP (*)

P.T. DECK BEAM

MIN 8d AT 6" O.C.

P.T. 2x RIM JOIST

18" DIA.

LAGS INTO MANUFACTURED LUMBER MUST HAVE APPROVAL DOCUMENTATION OR HAVE SOLID WOOD RIM BACKING w/ PENETRATING LAG SCREWS

SIDING OVER FLASHING

TC Figure 20 Deck Construction 2/23/11

WHEN P.T., DECK LEDGERS MUST BE ATTACHED TOMINIMUM 1” THICK ENGINEERED WOODPRODUCT. THE LEDGER ATTACHMENT MUST BE DESIGNED (ENGINEERED).

*

15/32” MAXIMUM SHEATHING

6’

30”

REQUIRED LEDGER CONNECTION FOR EXT. - STAGGERED DECKS USING MIN 1/2” LAG SCREWS w/ WASHERS

8’

23”

10’

18”

12’

13”

JOIST SPAN

SPACING OFLAG SCREWSWITH 15/32”SHEATHING