Rotting Expansion Joints

Tools:

circular saw
carpenter's square
hammer
measuring tape
block plane
caulking gun
gardening trowel and weeder
pry bar
gloves
safety glasses
scrap 2x4
treated 2x4 replacement lumber
gravel
asphalt sealant

1. Put on gloves and safety glasses and go to work removing the old wood using the pry bar, garden trowel or other tool (figure A).

2. Test-fit a scrap 2x4 in the space to make sure there's enough room (figure B).

3. Measure the length of the joint and cut a new 2x4 to size.

4. Place a layer of gravel in the base of the joint to allow water to drain away and help prevent rotting in your new lumber (figure C). Tamp the gravel down with the top of a hammer.

5. Using a hammer and a scrap board, hammer the new board into the joint (figure D). By placing a scrap 2x4 between the new board and the hammer you avoid leaving hammer marks on your new board.

6. Use the block plane to trim the edges of the 2x4 for a smooth fit (figure E). Place a piece of cardboard between the concrete and the plane to protect the block plane.

7. Pipe in a bead of asphalt sealant (figure F) to seal gaps and provide more protection from water damage. Let the sealant cure according to the manufacturer's instructions before walking on it.