BACKING FOR WOOD FRAMING
All walls need to be blocked between each stud a minimum of 10” high from
the pan floor. This blocking needs to be solid, 2- 2x6s stacked on edge with no gaps between plate and block or block to block works well, but any size lumber can be used as long as the finished height is at least 10” off the floor with no major gaps between the pieces used, where plumbing or other constraints prohibits the use of 2x blocking, plywood or other sheeting should be used. Any material used needs to securely fasten to the studs. Where blocking cannot be installed due to obstructions in the bay, sheet metal backing can be used, 20 gauges is best. We carry a supply of sheet metal backing as needed for your convenience.
OTHER BACKING APPLICATIONS:
Hot mopping also adheres to block, concrete walls, sheet metal, drywall, hardi backer, cement backer boards, denshield and other materials, all can serve as backing if used properly.
DAMS:
Dams should be a minimum of 2” above the height of the drain cap. This usually consists of 2x4’s stacked flat, brick, poured curb, or the pan is recessed. The standard height of the dam is 4-1/2" but can be adjusted for special needs consult your local codes before proceeding with the hot mop.
Tub walls and pony walls
When you have a your tub and shower laid out next to each other the dividing wall and/or ledge should be hot mopped. That wall needs to be faced with sheathing or filled between the studs from bottom plate to top with solid material. If the tub is lower than the top of the dividing wall then the portion facing the tub should be blocked and can be mopped down to the tub deck.
Tub ledges
When the tub deck is the same level as the dividing wall, have the tub deck sheathing or framing installed and we will mop onto the deck at least 6” for the protection that is needed here.