Some Advice for Installation of Fiber Cement Siding Sheet

When installing a shower or tub on an exterior wall, it is essential to air seal and insulate the wall cavities behind the shower and tub enclosure to prevent thermal bypasses that can result in moisture, heating, and cooling problems. The Solution Center Guide Walls Behind Showers and Tubsprovides information about how to air seal and insulate behind a shower and tub.

Cutting cement board requires tools different than those used for standard gypsum board; use abrasive saw blades or carbide-tipped cutters. Be sure that the framing is level and plumb before installing backer board to avoid alignment issues with premanufactured tub surrounds or tile.

Selected from: https://basc.pnnl.gov/resource-guides/cement-board-installed-behind-tile-and-panel-tub-and-shower-enclosures#quicktabs-guides=2