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#1
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Mortar Under Acrylic Shower Base
I'm re-doing a shower using an acrylic/fiberglass base. The
instructions say to put "mortar cement" under the base. Makes sense, there were lumps of grey rock-like substance under the one I pulled out. Problem is, I can't translate "mortar cement" into anything I can buy at HD, etc. My searches tell me to use the same mortar as laying bricks, or to NOT use the same stuff, use regular concrete mix, use regular mix with sand added, don't use regular mix as it will wreck the plastic, etc etc etc. I think I know less now than when I started. Can somebody tell me what it should say on the bag at the building center? Brand names are fine, if it isn't available around here at least I can ask for equivalent product. Thanks, Red |
#2
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Mortar Under Acrylic Shower Base
red wrote:
I'm re-doing a shower using an acrylic/fiberglass base. The instructions say to put "mortar cement" under the base. Makes sense, there were lumps of grey rock-like substance under the one I pulled out. Problem is, I can't translate "mortar cement" into anything I can buy at HD, etc. My searches tell me to use the same mortar as laying bricks, or to NOT use the same stuff, use regular concrete mix, use regular mix with sand added, don't use regular mix as it will wreck the plastic, etc etc etc. I think I know less now than when I started. Can somebody tell me what it should say on the bag at the building center? Brand names are fine, if it isn't available around here at least I can ask for equivalent product. Thanks, Red You are looking for "Thin-set Mortar" and you will find it in the tile section, as it is used to set tiles. |
#3
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Mortar Under Acrylic Shower Base
EXT wrote:
red wrote: I'm re-doing a shower using an acrylic/fiberglass base. The instructions say to put "mortar cement" under the base. Makes sense, there were lumps of grey rock-like substance under the one I pulled out. Problem is, I can't translate "mortar cement" into anything I can buy at HD, etc. My searches tell me to use the same mortar as laying bricks, or to NOT use the same stuff, use regular concrete mix, use regular mix with sand added, don't use regular mix as it will wreck the plastic, etc etc etc. I think I know less now than when I started. Can somebody tell me what it should say on the bag at the building center? Brand names are fine, if it isn't available around here at least I can ask for equivalent product. Thanks, Red You are looking for "Thin-set Mortar" and you will find it in the tile section, as it is used to set tiles. I'm no expert, but I think not. Thin-set is pretty runny. All the mortar-bedded shower bases and plastic tubs I ever saw go in were bedded in plain old mortar mix. You definitely don't want concrete, lest a stone poking up worry its way through the shower base. ISTR on TOH a year or two back, they showed people using gypcrete, and even a plastic foam that set up rock hard, instead. It doesn't need that much strength like a sidewalk would, it is just to keep the shower base from flexing as people stand and move in it. -- aem sends... |
#4
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Mortar Under Acrylic Shower Base
aemeijers wrote:
EXT wrote: red wrote: I'm re-doing a shower using an acrylic/fiberglass base. The instructions say to put "mortar cement" under the base. Makes sense, there were lumps of grey rock-like substance under the one I pulled out. Problem is, I can't translate "mortar cement" into anything I can buy at HD, etc. My searches tell me to use the same mortar as laying bricks, or to NOT use the same stuff, use regular concrete mix, use regular mix with sand added, don't use regular mix as it will wreck the plastic, etc etc etc. I think I know less now than when I started. Can somebody tell me what it should say on the bag at the building center? Brand names are fine, if it isn't available around here at least I can ask for equivalent product. Thanks, Red You are looking for "Thin-set Mortar" and you will find it in the tile section, as it is used to set tiles. I'm no expert, but I think not. Thin-set is pretty runny. All the mortar-bedded shower bases and plastic tubs I ever saw go in were bedded in plain old mortar mix. You definitely don't want concrete, lest a stone poking up worry its way through the shower base. ISTR on TOH a year or two back, they showed people using gypcrete, and even a plastic foam that set up rock hard, instead. It doesn't need that much strength like a sidewalk would, it is just to keep the shower base from flexing as people stand and move in it. Thin-set is only as runny as you make it by adding too much water. To bed a shower base, you need something that is soft enough to conform to the bottom shape so that it supports the base completely when it hardens. There will not be much room under the base, so this is where thinset comes in, as it will harden and maintain its strength even in very thin layers. If a thick bedding is needed, then masonry mortar "may" work |
#5
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Mortar Under Acrylic Shower Base
On Thu, 05 Nov 2009 19:17:11 -0500, aemeijers
wrote: EXT wrote: red wrote: I'm re-doing a shower using an acrylic/fiberglass base. The instructions say to put "mortar cement" under the base. Makes sense, there were lumps of grey rock-like substance under the one I pulled out. Problem is, I can't translate "mortar cement" into anything I can buy at HD, etc. My searches tell me to use the same mortar as laying bricks, or to NOT use the same stuff, use regular concrete mix, use regular mix with sand added, don't use regular mix as it will wreck the plastic, etc etc etc. I think I know less now than when I started. Can somebody tell me what it should say on the bag at the building center? Brand names are fine, if it isn't available around here at least I can ask for equivalent product. Thanks, Red You are looking for "Thin-set Mortar" and you will find it in the tile section, as it is used to set tiles. I'm no expert, but I think not. Thin-set is pretty runny. All the mortar-bedded shower bases and plastic tubs I ever saw go in were bedded in plain old mortar mix. You definitely don't want concrete, lest a stone poking up worry its way through the shower base. I used thinset, mixed to a "low slump" consistancy and just "worked" the base in. ISTR on TOH a year or two back, they showed people using gypcrete, and even a plastic foam that set up rock hard, instead. It doesn't need that much strength like a sidewalk would, it is just to keep the shower base from flexing as people stand and move in it. |
#6
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Mortar Under Acrylic Shower Base
"red" wrote in message ... I'm re-doing a shower using an acrylic/fiberglass base. The instructions say to put "mortar cement" under the base. Makes sense, there were lumps of grey rock-like substance under the one I pulled out. Problem is, I can't translate "mortar cement" into anything I can buy at HD, etc. My searches tell me to use the same mortar as laying bricks, or to NOT use the same stuff, use regular concrete mix, use regular mix with sand added, don't use regular mix as it will wreck the plastic, etc etc etc. I think I know less now than when I started. Can somebody tell me what it should say on the bag at the building center? Brand names are fine, if it isn't available around here at least I can ask for equivalent product. Thanks, Red My base flexed a bit when it was on the cement floor. Called the manufacturer and he recommended using expandable foam--the kind that is used to seal leaks etc. and comes in a spray can. I inserted the small nozzle extension in all the open spaces under the base and let it fill until it started coming out. Let it harden and then cut off all the stuff that had expanded outside of the base. It's been several years now without a problem and the base is solid--no movement at all. MLD. |
#7
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I've also taken the advice of a manufacture to use spray foam. WHAT A MISTAKE. I set a 200lb cultured marble bathtub with it. I placed 3-400 lbs of tools in the tub after I sprayed the foam. The next day, even with all the weight, the tub had risen 2" off the floor from the foam expanding underneath. You don't want a 1/2" thick bed underneath the pan, just something to stabilize it. Thinset mortar is the way to go. If you are concerned about not filling the voids in the pan, flip it over and fill them with thinset, let them dry, and then set the pan in a thinset mortar bed. Cement and the pan will not react, don't use plastic on the pan side. I use tyvek for the floor only because it's clean. Staple the snot out of it when you put it on the floor. 1/8-1/4" of mortar is all that's needed for a good set, the pan is essentially a large tile.
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