Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32 Page 33 Page 34 Page 35 Page 36 Page 37 Page 38 Page 39 Page 40 Page 41 Page 42 Page 43 Page 44 Page 45 Page 46 Page 47 Page 48 Page 49 Page 50 Page 51 Page 52 Page 53 Page 54 Page 55 Page 56 Page 57 Page 58 Page 59 Page 60 Page 61 Page 62 Page 63 Page 64 Page 65 Page 66 Page 67 Page 68 Page 69 Page 70 Page 71 Page 72 Page 73 Page 74 Page 75 Page 76 Page 77 Page 78 Page 79 Page 80 Page 81 Page 82 Page 83 Page 84 Page 85 Page 86 Page 87 Page 88 Page 89 Page 90 Page 91 Page 92 Page 93 Page 94 Page 95 Page 96 Page 97 Page 98 Page 99 Page 100 Page 101 Page 102 Page 103 Page 104 Page 105 Page 106 Page 107 Page 108 Page 109 Page 110 Page 111 Page 112 Page 113 Page 114 Page 115 Page 116 Page 117 Page 118 Page 119 Page 120 Page 121 Page 122 Page 123 Page 124 Page 125 Page 126 Page 127 Page 128membrane – that is on you. Luckily, measuring wet film thick- ness is very straightforward. There are a variety of gauges available to manually measure the thickness, so make sure that you are using one that measures in the range you need. Sometimes you will hear them referred to as ‘combs’ or ‘rakes’ because of their shape with numbered teeth that show the film thickness. We are including such a MAPEI wet film thickness gauge in select TileLetter issues. If you did not get one, contact your MAPEI sales rep. Once you have applied your wet membrane (and while it is still liq- uid), place the wet film thickness gauge straight down into the mem- brane. Do not wiggle or move the gauge, just make sure that it goes all the way to touch the substrate. Remove the gauge and begin look- ing at the bottom of the teeth. Teeth that are longer than the membrane is thick will have membrane on them. At some point, you will find a tooth that has no membrane on it. The thickness is between the number on that tooth and the one next to it that has membrane on it. That’s it! Try it in several places to make sure you are seeing consistent results and wipe off your gauge quickly after every test - you do not want buildup on the teeth. Once you have performed the test a few times, it becomes a quick double-check to ensure you are get- ting enough membrane applied. It can also show if you are applying too much. If you ever need help determining the required thickness of a MAPEI membrane or have questions about the process, feel free to call 1-800- 992-6273 to speak with a Product Support Representative. TECHNICAL FEATURE –––––––––––––––––––––––––––––––––––––––––––––––– The bottom of the tooth below number 14 is touching the membrane. Correct Incorrect The bottom of the tooth shown on the left is the correct contact point for a membrane WFT of 14 mils. 60 TileLetter | February 2017