Installation Guide

English | 2
WALL INSTALLATION (Continued)
2 | Determine the HardieBacker
®
Cement Board with HydroDefense
™
Technology layout
• Boards may be installed vertically or horizontally.
• Edges of the board parallel to framing must be supported by a structural
framing member.
• Score and snap boards to required sizes and make necessary cutouts.
3 | Attach the HardieBacker
®
Cement Board with HydroDefense
™
Technology to framing
• HardieBacker
®
Cement Board with HydroDefense
™
Technology has internal
waterproofing treatments. Does not require a moisture barrier.*
• Attach the HardieBacker
®
Cement Board with HydroDefense
™
Technology.
• Provide a 1/4 in. clearance gap between the floor, tub or shower receptor
base and the cement board.
• Do not place cement board into the shower pan mortar bed.
• Fasten the product with specified nails or screws (as listed in “Materials
Required”) a maximum of 8 in. on center at all supports.
• Keep fasteners 3/8 in. from board edges and 2 in. in from sheet corners.
• Set fastener heads flush with the surface, without overdriving.
4 | Joints and Penetrations
• Seal fixture penetrations, plumbing penetrations and abutments to dissimilar
materials with flexible sealant (see “Materials Required”).
• Fill all joints with mortar (see “Materials Required”). While mortar is still
workable, embed minimum 2 in. wide high-strength alkali-resistant glass
fiber tape in the mortar and level.
• Do not use all-purpose joint compound or paper tape.
• When complete waterproofing is required, seal all joints, edges and fastener
penetrations with a liquid waterproofing membrane. Follow the liquid
waterproofing membrane manufacturer application instructions.
* Some application areas may require additional waterproofing. Refer to local building code requirements.