Shower-pan bottom is not flat....
So the foam glued on by the vendor makes the pan underside not level-it's like a see saw on the floor. I figured out a way to have it be level during the upcoming final installation with piers/posts, but recall many saying to use concrete or something else when doing final placement to embed and stabilize the pan for good... What material is recommended again since not sure which video our TileCoach leader gave his recommendation or should I just use construction adhesive? OK for the stryofoam? Pictures show the underside and how the pan looks in the shower alcove...
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Update: oem said to use a stringer 2x4 along back edge, mortar, and washered screws above the lip to anchor. I added folded Viton to avoid damaging the porcelain as I pinch the lip. Showing the mortar under the foam for a rock solid base.