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Old 09-08-2009, 03:32 PM   #1
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Bolting Ledgers to Concrete


In a concrete slab that was recently poured the installed 1/2" bolts every 32" for a deck ledger. Is this enough anchor bolts for a ledger? Also what is the best way to install the ledger over these existing bolts, they are not perfectly set so I anticipate it would be difficult to get my ledger installed perfectly without slotting the bolt holes in it.

I was thinking of maybe drilling oversized holes and then after the ledger is bolted to drill and install a few more anchor bolts to make sure it doesn't shift?

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Old 09-08-2009, 03:52 PM   #2
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Bolting Ledgers to Concrete


check this link out it should be of some use to you. www.decks.com/article18.aspx

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Old 09-08-2009, 04:23 PM   #3
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Bolting Ledgers to Concrete


Thread a couple of nuts on the bolts to accept the impact of a hammer, and you will be able to easily tap the bolts into a straight, perpendicular position.
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Old 09-08-2009, 04:27 PM   #4
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Bolting Ledgers to Concrete


the decks.com info was helpful and verified that the spacing of the bolts, is there a trick to getting the ledger positioned correctly with bolts already in place, would drilling oversized holes be ok?
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Old 09-08-2009, 04:42 PM   #5
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Bolting Ledgers to Concrete


could you snap a reference line across the edge of the slab with a chalk line. With the top of the line being the top of the ledger. take the ledger and put it on top of the bolts , mark the ledger at the center of each bolt, then take a square and continue these marks the entire width of the ledger. now lay the ledger on some saw horse's . now go back to the slab and measure from the line you snapped to the center of each bolt and write these measurements down. then transfer these measurements to the ledger. then drill. BOB
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Old 09-08-2009, 05:08 PM   #6
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Bolting Ledgers to Concrete


Here is the Prescriptive Deck Code requirements for 2006, page 12, Fig. 5: http://www.awc.org/Publications/DCA/DCA6/DCA6.pdf

It depends on the span as well as the joist size, as per code.
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Old 09-08-2009, 05:31 PM   #7
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A drawing to go along with Buletbob's post
Measure all from top (chalk line) and from the same end. Transfer to undrilled ledger board, then drill.
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Bolting Ledgers to Concrete-ledger-layout.jpg  
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Last edited by Willie T; 09-08-2009 at 10:18 PM.
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Old 09-08-2009, 05:41 PM   #8
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Bolting Ledgers to Concrete


thanks this pretty much answers my questions. my ledger is actually going to be above the concrete (its a patio slab) but I will either measure from a string line or snap a line for bottom of ledger
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Old 09-08-2009, 06:50 PM   #9
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Bolting Ledgers to Concrete


Quote:
Originally Posted by Willie T View Post
A drawing to go along with Buetbob's post.....
Impressive drawing Willie, Did you use SketchUp?

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Old 09-08-2009, 08:53 PM   #10
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Quote:
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Impressive drawing Willie, Did you use SketchUp?
.
As usual. I hardly ever even touch my AutoCAD anymore.

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