Install Instructions

IOM-WR-WW 1616 32 of 36

See phase 5 for complete details and Cautions. This application into a shower area must

be verified by the local inspector or the authority having jurisdiction.

Installing WarmWire above the waterproof liner

Installing WarmWire below the waterproof liner

WarmWire can be installed on a sloped mortar bed below the waterproof liner layer using

CableStrap or a 2-inch strip of HeatMatrix. Ensure the WarmWire and CableStrap or

HeatMatrix are fully covered in mortar, and trowel to provide a smooth finished surface. Apply

waterproof liner over the smoothed mortar surface according to the liner manufacturer's

instructions. Ensure the coverings above the waterproof liner do not exceed R-0.5 to avoid

capturing too much heat.

WarmWire can be installed above the waterproofing liner if the attachment method does

not puncture the liner. A overlay of thinset is first applied over the liner. CableStrap or

2-inch HeatMatrix strips are then attached to opposite sides of the shower using hot glue

or double sided tape. Leave a 2 inch gap between the drain flange and WarmWire. When

using HeatMatrix, strips are covered with mortar and Joint Tape after the wire is in place.

This reduces the chance of water becoming trapped in the low sections of the HeatMatrix

membrane. Ensure WarmWire is fully embedded within a cement based mortar before tiling.

Mortar bed sloped

towards drain

ThinsetWarmWire secured with hot

glue min. 2" from drain

Joint Strip Thinset

Thinset

HeatMatrix 2-

inch strip

Curb covered with

waterproofing

Waterproof

liner

Tile

Backer board

Mortar bed sloped

towards drain

WarmWire Cement

Mortar

CableStrap or