Kyle Diamond

My remodeling company enjoys working on many unique and historic homes in the Eastern Hudson Valley region of New York. Last month, I described work related to replacing an existing 13-by-18-foot screened porch with a larger, 15-by-22-foot sunroom on a French cottage–style home. In this article, I'll focus on the installation of the sunroom's radiant stone-tile floor system, which was comprised mainly of products from Mapei. The floor was installed over electric radiant heating in a house that would not be used continuously through the winter, and the goal of the electric radiant was only to help temper the room, while primary heating was supplied by a mini-split heat pump. The clients liked the idea of the electric radiant quickly heating the floor surface—a more immediate, and therefore more comfortable, heat.

Although we'd been using Mapei's products for about a decade, it wasn't until a few years ago that we found out about its MTI (Mapei Technical Institute) training seminars. Classes include hands-on workshops for surface preparation, repair, and installation, as well as instruction in the industry's newest techniques. My lead carpenter and I...

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