How to Make a Glass-Block Shower

Measure the length and width of your shower pan with a measuring tape to determine the dimensions of the shower. Divide the dimensions of the shower by the dimensions of your glass blocks in order to determine approximately how many blocks you will need. Glass blocks are generally 6-by-6-inches or 8-by-8-inches.

Draw a sketch of your desired glass block shower to use as a reference during construction. Decide whether you want to install a shower door or simply leave an opening through which to enter and exit the shower.

Mix up a batch of white glass block mortar according to the manufacturer's directions. It is best to mix up the mortar in a large plastic bucket using a drill-powered mixer to ensure an even consistency.

Apply a generous layer of mortar, about 1/2-inch thick, to the top of the shower pan ledge starting in the corner nearest the wall and extending to a length equal to the length of four or five of the glass blocks. Use a small trowel to evenly spread the mortar.

Lay your first glass block on top of the mortar in the corner nearest the wall, leaving about a 1/2-inch of space between the side of the block and the wall. Gently press the block down into the mortar and then place a second block next to it.

Continue to install glass blocks in this manner until you have filled the area you covered with mortar. After laying each block, place a plastic spacer between it and the adjacent block to maintain even spacing. Place a level between the tops of each pair of adjacent blocks to ensure that the surface is level. Tap blocks with a rubber mallet to make adjustments if necessary.

Spread more mortar on top of the shower pan ledge and continue laying glass blocks until you have completed the first row. When you reach the corner, install a corner block that is finished on two sides instead of one that is a standard glass block.

Spread a layer of mortar on top of the first row of glass blocks, press spacers into the mortar, and lay your next row of blocks. Continue to use the level to make sure your rows are level.

Install a column of glass blocks with one finished end on either side of the shower opening if you do not intend to install a shower door. By installing blocks with one finished end, your shower will look more clean and complete. Lay a row of finish blocks on top of the completed shower wall to give it a tidier look.

Fill a mortar bag with mortar and then go back and fill any gaps left between the blocks. When finished, use a damp sponge to remove any excess mortar. Allow the mortar to cure for a full 72 hours before using the shower.