According to backer board manufacturers and tile setters installing backer board directly over an old solid wood subfloor is risky for a couple of reasons.
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Unlike wood or drywall sub surfaces cement backerboard will not rot warp or grow mold and mildew when exposed to water.
First changes in humidity make solid wood shrink swell and cup more than plywood.
Steps to follow in how to install tiles in the hardie backer board.
Anyone can enjoy the benefits of a cement board shower system if you follow these 3 easy steps.
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Use a polymer modified thin set a type of mortar to attach the backer board to the subfloor.
Never install new tiles over existing tiles or onto an unprotected wood or plywood floor.
Cement board commonly sold under trade names such as durock hardiebacker and wonderboard is now the standard underlayment used for ceramic porcelain or stone tile laid with thinset mortar adhesive cement board is used for most floor tile and has all but replaced plywood and drywall backer materials for wall tile applications in wet areas like showers and tub surrounds.
This provides a solid surface under the tile that prevents flexing that could lead to cracking.
Backer board is a common material used in tiling projects.
Install a cement based backer board following the manufacturer s instructions.