Anchoring the Ledger

Begin building a deck on a sloped sight by anchoring the ledger.

Anchoring The Ledger

Most decks are attached to the house with a ledger because it easily adds strength to the structure. In some areas with unstable soil, however, a deck must be unattached to prevent damage to the house and deck if it shifts.

Make it level and strong
The ledger will act as the reference point for laying out the entire deck, so take time to position it precisely and level. If the siding or door is not level, you may be tempted to install the ledger out of level for appearance's sake. Resist the temptation: An angled ledger greatly complicates the rest of the construction process.

Attach the ledger with lag screws driven into framing members -- not just into the sheathing. Most homes will have an exterior joist (sometimes called a band joist) just below the door sill. That's where the ledger goes. Drill test holes to make sure the screws will have a hefty 2x board to grab.

Prestart Checklist

Four to five hours to cut and install a 16-foot ledger board on a frame house; longer to attach to masonry

Layout square, tape measure, level, circular saw, hammer, drill, socket wrench

Measuring and cutting boards, testing for level, driving lag screws

Draw the exact location of the ledger on the house

Ledger board(s), lag screws with washers, shims if necessary

Step 1

To mark the top of the ledger, measure down from the bottom of the door sill the thickness of the decking plus 1 inch. This small step-down will keep most rain and melted snow out of the house.

Step 2

Using a carpenter's level or a water level and a straightedge, draw a level line on the house siding to indicate where the top of the ledger should be positioned.

Step 3

Mark the outside edges of the ledger on the siding.You may be able to remove siding. If you are cutting the siding, extend this mark 1-1/2 inches (the thickness of the rim joists) past the actual length of the ledger on each side. This will allow you to fasten the rim joists to the ends of the ledger.

Step 4

If you have beveled siding you can cut out a recess for the ledger or if your codes allow it, install beveled cedar siding as a flat backing. Rip-cut the cedar so its thickness matches the thickness of the siding. Attach each piece with a nail every few feet.

Step 5

If there is an existing concrete stairway, your inspector may want you to remove it. If you do not remove it, you'll need to cut the ledger to fit around it. Hold the ledger in place and mark for a cutout so that the ledger will rest on top of the concrete.

Step 6

Cut the ledger board and the header to length. The header is usually 3 inches longer than the ledger because it's fastened to the ends of the rim joists. If you need to notch the ledger for an obstruction, use a circular saw, stopping just short of the corners. Finish the cuts with a handsaw.

Step 7

Lay the ledger and header next to each other with their crowns facing outward and the header overhanging the ledger by 1-1/2 inches on each end. Mark both boards for joists, in this case every 16 inches. Mark a large X on the side of the line where the joist will go.

Step 8

Push a flashing up beneath the siding about an inch. Have a helper or two hold the ledger in place while you drive 3-inch screws to hold it in place temporarily. Make sure the ledger has its crown side up. Test the ledger for level and adjust if necessary.

Step 9

Check indoors to make sure lag screws will not hit any gas or water lines or electric cable. Counterbore pilot holes if you want recessed lag screw heads. If possible, avoid your joist marks. Then drill through the ledger only, with a bit slightly smaller than the diameter of the lag screw threads.

Step 10

Use a long bit to bore a smaller hole through the house framing. Slip a washer onto a lag screw and tap the screw partway into the hole. Tighten the screw with a socket wrench, keeping it perpendicular to the ledger.

Step 11

Every few feet along its length, check the ledger's face to see that it is close to plumb. To make adjustments, try tightening one screw. If that doesn't work, loosen both screws, insert a shim at the bottom or top, and retighten.

Comments (3)
trangphongsang wrote:

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8/6/2016 12:27:32 AM Report Abuse
sgfsd wrote:

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6/9/2016 01:20:46 PM Report Abuse
dpreece3 wrote:

This is going to be very helpful to frame my deck.

4/13/2011 08:32:58 AM Report Abuse
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