Awake
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I've been perusing the posts on this forum, but haven't yet fully understood the way a traditional shower pan (with a preslope, PVC liner, and upper layer of mortar over top) goes together and works. Several questions, or perhaps someone can point me to more information:
1) What binds the upper layer of mortar to the lower layer and/or to the floor? It seems to me that the pvc liner creates a complete separation between the layers. Is that correct?
2) How is the wall tied into the pan -- as I understand it thus far, the preslope is made and dried, then the liner is installed in the pan, over the curb, and up the walls the requisite amount. Is the second layer of mortar then applied before the cbu is put on the walls, or the other way around?
3) moisture barrier on walls -- I think I am seeing two different approaches; one is to apply a moisture barrier behind the cbu (consisting of basic plastic sheeting?); the second is to apply a moisture barrier on top of the cbu, either in the form of a liquid membrane such as RedGard, or a sheet membrane such as Kerdi. What are the advantages/disadvantages of these two approaches?
4) final question -- if a liquid membrane such as RedGard is used, can or should there be a second mortar bed over it, or can (or should) thin set and tile be applied directly?
Thanks for any help!
1) What binds the upper layer of mortar to the lower layer and/or to the floor? It seems to me that the pvc liner creates a complete separation between the layers. Is that correct?
2) How is the wall tied into the pan -- as I understand it thus far, the preslope is made and dried, then the liner is installed in the pan, over the curb, and up the walls the requisite amount. Is the second layer of mortar then applied before the cbu is put on the walls, or the other way around?
3) moisture barrier on walls -- I think I am seeing two different approaches; one is to apply a moisture barrier behind the cbu (consisting of basic plastic sheeting?); the second is to apply a moisture barrier on top of the cbu, either in the form of a liquid membrane such as RedGard, or a sheet membrane such as Kerdi. What are the advantages/disadvantages of these two approaches?
4) final question -- if a liquid membrane such as RedGard is used, can or should there be a second mortar bed over it, or can (or should) thin set and tile be applied directly?
Thanks for any help!