Specification

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The information in this document is presented in good faith, but no warranty, express or implied, is given nor is freedom from any patent in as much as any assistance furnished by CUSTOM with reference to

the safe use and disposal of its products provided without charge. Custom Building Products assumes no obligation or liability therefore, except to the extent that any such assistance shall be given in good

faith. Product speciﬁcations subject to change. Visit CustomBuildingProducts.com for updated technical data sheets and SDS information.

©Custom Building Products 2021

FAQWA 4/21R

For additional information, visit CustomBuildingProducts.com or call

CUSTOM Technical Services at 800.282.8786.

Question: What kind of mortar should be used to set tile on walls and ceilings?

Answer: When tiling vertical or suspended surfaces, it is important to use a mortar that has excellent non-sag qualities.

These mortars are designated by ANSI with the letter “T” after the standards number. ProLite

Premium Large

Format Tile Mortar that exceeds the requirements of ANSI A118.15T and is formulated to support the weight

of large and heavy tiles on walls. ProLite and MegaLite

weigh 40% less than typical mortars because they are

formulated with CustomLite

technology and help reduce overall load bearing created by tile installation.

Question: What about the needs of glass tile?

Answer: Glass Tile Premium Thin-set Mortar is highly polymer-modiﬁed to bond to the smooth surface of glass. Its ﬂexibility

is designed to accommodate the extra movement of glass tile, which is sensitive to thermal changes. The bright

white color offers a clean, uniform appearance when installing clear or translucent glass tile. Check with the

manufacturer as some glass tiles cannot be installed over membranes.

Question: Are installation needs different on exterior versus interior applications?

Answer: Yes, exterior tile assemblies are subject to much wider temperature swings and in many cases more prolonged

water exposure than interior tile installations. The proper mortar should be selected for these demanding

exterior installations that experience freeze/thaw cycles and other thermal ﬂuctuations. Use ProLite or MegaLite

Ultimate Crack Prevention Large Format Tile Mortar, which also exceeds the non-sag requirements of ANSI

A118.15T for tile installed in exterior and/or wet applications. Rapid setting versions will not contribute to

efﬂorescence. Tiles must be ﬂat back-troweled to achieve the required 95% mortar coverage to the back of the

tile and tiles must be well bedded. Spot bonding is not acceptable! Movement joints should be placed every

8-12 feet within the tile assembly with a ﬂexible sealant like Commercial 100% Silicone Caulk. Liquid-applied

RedGard can mitigate efﬂorescence due to moisture migration in exterior tile and grout, and help protect the

building envelope from water intrusion through the tile assembly.

Question: Do walls require special grout?

Answer: Walls can be stained by accidental splashes and it is important to use a stain resistant grout like Fusion Pro

Single Component

Grout. Epoxy grout can be used, but should be protected from strong UV light, as the color

will shift. In extremely wet environments, a cement grout, like Prism

Color Consistent Grout, is the best choice

and can be sealed against staining with Aqua Mix

Sealer’s Choice

Gold.