Warm Stone

The primer was rolled out with a 3/8-inch roller on a clean slab.

Electric radiant mats were rolled out according to the manufacturer's installation diagram. The longest mat needed to be carefully cut (without cutting the wire) in three places to make 180-degree turns.

An in-floor sensor probe was run to the thermostat so the radiant mat could be controlled by the temperature of the floor, as well as by ambient air temperature.

A glue gun was all that was needed to tack the mats in place so they didn't shift during the installation of the self-leveling compound.

Tapcon screws drilled roughly 48 inches on-center served as benchmarks for the finish elevation of the underlayment.

A story pole and laser level were used to ensure the tops of the screw heads were level. It's time-consuming, but saves effort down the road because it yields a better result.

The underlayment was mixed outside. The crew used a high-speed mixer and an egg-beater paddle to mix it to the right consistency.

The grid of screws helped guide where to dump the buckets of underlayment mix to evenly distribute it.

A float-like tool was used to level the self-leveling underlayment to the tops of the previously installed screws.

As it hardens, the self-leveling material emits a lot of heat and moisture that needs to be vented to prevent damage to the woodwork.

After the underlayment cured overnight, a latex primer was rolled on. This would help the crack-isolation membrane bond to the underlayment.

The crew cut and laid out the crack-isolation membrane before installing it.

The crack-isolation membrane used here had a split-release backing.

It took two guys to lay out the membrane, release the backing, and ...

... roll out the membrane flat.

The crack-isolation membrane was pieced in around the door opening.

Once the polished stone was cleaned of dust, the crew pre-sealed it.

It took a day to cut and dry-fit the stone to conform with the pattern.

The mortar was spread with a 1/4-by-3/8-inch notched trowel.

After excess mortar was removed, the tiles were grouted and sealed.

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