When replacing a shower pan, some shower pan manufacturers call for the shower pan to sit directly in an adhesive or into small mounds of mortar. Please consider supporting our work with a contribution to wikiHow. Should I stop the cement board at the top lip of the base? Make sure that you use plastic shims to avoid the possibility of wood rot. All the flooring and subfloor has been removed, and I'm at the point where I am getting ready to replace some joists and sister one. A. Pan pre-slope has NOTHING to do with an unlevel subfloor and EVERYTHING to do with removing water under a tile shower floor.The sand mix (accompanied by pea gravel at the drain assembly) are specifically used to move water away. The pan will move and flex when someone showers. I purchased a 4 foot level to make sure this was exact. This results in a base that still is operable but is more susceptible to flexing. I don't like to destroy what is useful, and that would be labor intensive and expensive. They are designed to support the shower pan as a whole. Improperly cleaning the shower pan over time may deteriorate its structural quality. This is not a problem as long as no water leakage has developed. If mounds of mortar are called for, mark the locations on the subfloor per the manufacturer’s instructions. Plastic is not an inherently strong material; it always must be supported in some way, whether with support ribs or with a mortar base. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/c\/c2\/Install-a-Shower-Pan-Step-1-Version-4.jpg\/v4-460px-Install-a-Shower-Pan-Step-1-Version-4.jpg","bigUrl":"\/images\/thumb\/c\/c2\/Install-a-Shower-Pan-Step-1-Version-4.jpg\/aid1403233-v4-728px-Install-a-Shower-Pan-Step-1-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"
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