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Cutting backboard
Next, you have to measure and cut the new wall
section. The best choice is cement backerboard. It is constructed from cement
with a nylon mesh on either side. It is strong and tolerates water very well.
There are many different brands (Durock, Miracle board) but the practical
application seems to be the same. So called "Green Board" is another choice.
This is drywall that has been treated to improve its water resistance. Treated
or not, it does not stand up to water like cement board does. It is unadvisable
to make the patch with "green" board.
Measuring and cutting Cement Board
Measure the opening that now exists. Using a square,
transfer these measurements to the cement board. Cement board seems fairly
tough but is actually fairly easy to cut. There are two ways:
The first is to use a diamond wheel mounted on an
angle grinder or other saw. If you have these tools, they make cutting the
cement board easier. If you use this method, be aware that it creates quite a
bit of dust and flying debris. Wear appropriate safety equipment.
The second is to use a razor knife. First you must
cut the mesh on one side. Score the cement board with a razor knife until you
cut the mesh. You will likely have to make several passes. Second, snap the
board away from you but do not allow the waste to hang free or it might pull the
mesh from the other side. Fold the snapped side over and, using you razor
knife, cut the mesh on the other side.
Make sure that your cuts are as accurate as
possible. If you need to trim areas, you can simply run the knife along the
edge. Hold the knife so that the blade bites slightly into the edge. This can
be a tedious process so try to get it right the first time.
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