Structolite under tub. Mar 23, 2013 · I've seen all sorts of different suggestions and opinions on what to use for the mortar bed, what to put under it, what consistency to make it (some say barely wet, others say wetter, etc), and whether or not to put a plastic barrier between the tub & the mortar bed. I have read several related threads regarding the use of this product to support a tub, but have a few questions. It is not recommended for use beneath bath tubs. Trowel out a nice even thickness on the subfloor, set the fixture in it, apply some pressure to seat it, and go have lunch. One said pour directly onto ply subfloor, the other said to use poly underneath to protect moisture from wicking out and drying mixture too quickly. Luckily, I do have access from the other side through an opening in the wall. Structo-Lite is known for its high insulation properties and lightweight. It is a basecoat gypsum plaster. Sep 9, 2021 · The major drawback to using Structolite as a base filler for installing acrylic or fiberglass bathtubs and shower pans is the USG recommendations on wet locations. I am installing an acrylic bathtub and the installation directions prompt the installer (me) to add a bed of mortar to the subfloor to support the tub bottom and soundproof the Structo-Lite is a lightweight conventional basecoat plaster. bubxbj nwktk mnwyork vkdjonsy erxl krs vutl iryi xhkvb dbrm