Step 1: Cut Subfloor and Set Drain
NOTE: This drain can be installed with or without a shower curb. If the curb is used, then the subfloor does not need to be cut out.
Step 2: Blocking to Support the Subfloor
Step 3: Create Slope to Drain
When the proper height is calculated, draw a line to use as a guide when creating the mortar bed slope. If the shower is larger, it will be necessary to add blocking between the wall studs to accommodate the height of the mortar.
The mortar sits right on the subfloor. All waterproofing will be done after the drain body and mortar bed are installed.
Step 4: Waterproofing
Run two beads of the sealer on the drain, then use modified thin-set to set the membrane into the bed. Set the sheet membrane over the drain, press it into the thinset, and clamp it down.
The sheet membrane can be folded and creased ahead of time to fit the shape of the shower. It must go up the wall 6". Consult the manufacturer's instructions for placement on walls, curbs and the floor outside the shower.
Our drain kit did not include a sheet membrane that was big enough for the shower, but it can be ordered separately. The rest of the pan was waterproofed with Mapei's waterproofing membrane, Mapelastic™ http://www.mapei.com/CA-EN/product-detail.asp?IDProdotto=100355&IDTipo=227&IDLinea=102
The walls go in after the sheet membrane is installed. Liquid membrane was installed in several coats both before and after the wall backer board installation.
Step 5: Set Drain Height
After the tile has been installed, use the included tool to adjust the screws that support the drain cover. The drain will then be flush with the tile.
In this particular installation, the floor tile was a tad thicker than the shower tiles, so the floor tile was the better choice to use as the guide.