A shower pan liner is a part of the shower we never get to see in any complete shower or bathroom set up. That's because it goes below the tiles and the mortar that forms the floor of the shower pan.
Folding the corners of a shower pan liner will prevent moisture from going below the liner and causing damage to your concrete, and potentially even seeping through the subfloor and drenching the ceiling of the room below. These kinds of accidents with water from a shower are very common, but they are easily avoided. Among the methods of preventing moisture from getting passed the tile area is to ensure that your shower pan liner is folded over, rather than cut away where it touches the wall. Folding the corners of your shower pan liner has to be done carefully, but if you have a little bit of home improvement experience, you can perform this job yourself by following a few simple steps.
Step 1 - Don't Cut the Liner
The first thing you must do is not follow in the footsteps of many homeowners, who create the corners of their shower pan liner by cutting through the liner. This will simply mean that water has an extra area to penetrate. Cutting the liner also means that it is vulnerable to being penetrated by water, whereas a corner seals the liner off from this kind of damage. Cutting the liner means that there is no allowance for shrinking. Rather than cut it, you should fold it according to the manufacturer's instructions. Cutting the liner is probably easier than following the guidelines, but you will avoid damaging your shower pan by folding rather than cutting.
Step 2 - Fold the Liner Over the Curb
You will have to tuck the liner over the shower curb before you fold the corner, in order to keep it secure. Take your liner and stretch it over the curb, then nail down the edge of the curb. The nail should keep the liner firmly attached to the curb. If you have this line only on 1 side of the shower, nail it to the wall on the other side. Take care that the liner is secured without leaving large holes in the surface.
Step 3 - Securing the Fold
Once you have nailed the curb, tuck the corner and secure it in place. Leaving the corner flapping will not make the shower waterproof, and could pose a safety hazard. Simply folding and leaving the liner will not work either. You will have to secure the fold in place using a roofing nail. Fold the edge of the liner over so that you have what is known as a hospital corner, with the ends under the main body of the liner. Place the nail close to the top and hammer it down into a wooden block or space between studs if you are laying the liner against a wall. Roofing nails are long enough to do the job, so long as you don't require that they extend through a large area of wood. Ensure that the corner is laid completely flat.