b'TECHNICAL floor heating wires. Once the SLUSLUs have come a long wayhascured,theinstallercanworkThefirstselflevelerwasintro-on the floor without worrying aboutducedtothemarketin1978. damagingtheheatingwires.AndToday, there are a range of appli-gypsum based SLU is ideal for usecation devices and pumps that use over in-floor hydronic heat tubing.up-to-date technology and provide easier workability. For small jobs, you can use manual barrel mixing. Its very important to measure water capacity and to use proper tools to be sure right amount of water is added every time. UNDULATEDFLOORSAn undulatedfloorcoveredwith cement board is still an undulated floor. A SLU offers a bondable sur-face and a flat and smooth finish. Installing over existing tile instal- Additionaltoolsandresources lations help the job run smoothly, such as Installing over existing tile instal- a cart for the mixing barrel, a spiked lationisbecomingmorepopularroller to break surface tension, dust since it eliminates costly tear-outscontrol system and leveling pegs. and health risks from the resulting dust. Be sure to investigate primers thataredesignedfornonporous surfaces if you are tiling over tile, andmakesureexistingtileand stonewhichwillbecomeyour substrateis well bonded. Another stepyoumayneedtotakeisto strip all wax and allow surface to dry thoroughly. Be sure to consultFor larger jobs, new technologies the manufacturer to determine suit- range from portable small capacity ablesubstratesandbestproductpumps to medium capacity pumps recommendations,andprimeasthat are modular or trailer mounted, necessary with a product designedandhighcapacitypumpsperfect for the porosity of your substrate.forurbanapplications.Evaluate 100TileLetter | May 2020'