Ledger
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Ledger Board Fasteners

It is very important that you use the correct size and type of fasteners to install your ledger board.  Your deck will depend on the load carrying capacity of these screws or bolts to support hundreds of pounds and prevent the deck from ripping away from the house.  The most common method is to install ½” lag bolts with washers or carriage bolts with washers.  You will usually need the length of the bolt to be at least 4”-6" to penetrate through the 2x ledger board, the house sheathing and into the solid house rim.  Never counter sink bolts.  This will significantly weaken the ledger board.  In a ledger board application, a ½” x 4” lag bolt was tested to provide 180 lbs support of allowable shear load per screw. 

Be sure to know what you are connecting to. Standard bolt patterns are based on a solid connection to a solid-sawn and fully supported band joist in the home. Lag screws that hit wall plates or studs may not be comparable.
 
The fasteners must be compatible with pressure treated lumber to prevent corrosion.  Typically you will need to install your bolts alternating high and low 2" from the top and bottom of the ledger board.  As a rule of thumb bolts can be spaced 16" on center for supporting joist span up to 12' in length.  Longer joists will require tighter bolting patterns. 
 
 
 
 

2”x8” Ledger

Joist Span From Ledger To Beam (feet)

6

8

10

12

14

16

On-Center Spacing Of Bolts (inches)  

36”

36”

34”

29”

24”

21”

 

2”x10” Ledger

Joist Span From Ledger To Beam (feet)

6

8

10

12

14

16

On-Center Spacing Of Bolts (inches)  

36”

36”

35”

31”

26”

23”

 

2”x12” Ledger

Joist Span From Ledger To Beam (feet)

6

8

10

12

14

16

On-Center Spacing Of Bolts (inches)  

36”

36”

36”

31”

29”

26”


 
 


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