I’m installing a new shower in my house. Do i need to provide a sloping mortar bed under the hot mop or membrane?? Seems logical to me. Any specific technical info would be helpful. As far as thickness es etc. would be helpful.
Also on a tile floor can foam insulation be used under 1 1/2in mortar bed ???
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Can I talk you out of using hot mop and into using either a membrane like Chloroloy or a system like Schluter's Kerdi?
If you do use hot mop, yes, I would slope under it.
For some reason hot mop is still popular around here. I am actually leaning toward membrane. Why wouldn't you slope under the membrane seems like it would be better to make sure the water didnt find a low spot and stay there.??
Hot mop is dead. Not sure what you are doing with the foam.
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I want additional insulation under a radiant a hydronic floor
Why?
Do we have to pull every tidbit of info from you?
Put it under the subfloor.
Now tell me why you can't.[email protected]
It's Never Too Late To Become What You Might Have Been
under thhe subfloor is insulated with fiberglass, but as I stated, i want additional insulation. I will either having a 2 1/4 mortar bed or I thhought i might be able to put 3/4 blue faom board and 1 1/2 mortar bed. Seems reasonable to me. But if the foam under the mortar bed is a problem then.....
That motar bed sounds like overkill. Is this gypsum?
Never heard of the foam under mortar. Is this a common practice?
Try heatinghelp.com or something like that or possibly start a thread over at heating help in this forum.
Eric[email protected]
It's Never Too Late To Become What You Might Have Been
Why extra insulation in that one spot? What does you expect to gain?And why the insulation under the sub-floor. What is the construction and what is the location?
you'vve got radiant heat warmoing the floor but for some reason you want to insulate so that the shower floor can't recieve this heat????? That's the one place where you want it warmer if anything!
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"Hotmop is Dead"It sure is, especially when you hire a roofer who does not know--
How to slope it.
How to square the corners
How to fold the corners
How not to cover the weep holes.
to cover the dam fully.
to read how the Code wants it.
How to test it.There use to be specialist, are they still around in your area?
There use to be specialist, are they still around in your area?
The all left for the coast......the left one![email protected]
It's Never Too Late To Become What You Might Have Been
Eric,When I moved here (San Diego area) in '99, I was appalled to learn that hot mop is still king here. What a poor technology. In Denver, hot mop was gone in the 80's.Kerdi makes the other systems obsolete. The Kerdi drain, specifically, since others make good membranes that can be tiled over directly. Nobody else makes a comparable drain, though.Bill
I'm still dying to get my hand on a Schluter job.
These old dinosaurs won't give in to easy though![email protected]
It's Never Too Late To Become What You Might Have Been
IIRC Boris/Scooter said that in the LA area that hot mop was still standard and you had to ask for an exception to do anything else. That was about 2-3 years ago.Useing the advance search at the top of the page for - hot mop shower - should find some of the messages.You might also want to ask over at the john bridges tile forum. I have seen Scooter posting over there recently.
All you need, is to know about Schluter products.
Forget hot mop. Forget a CPVC membrane. Forget a clamp-in shower drain with weeps. Go to the John Bridge forum, where tile is the ONLY topic, and look at the Kerdi shower book.
I'll read between the lines and assume you want to put hydronic radiant in the mortar bed or electric radiant above it. Use Wedi-board (which is a foam based tile underlayment) underneath the radiant, as they have done for years in Europe, and use Kerdi under the tile and above the radiant heat source. If you're using electric radiant in a shower you better check code, wire it to a GFCI, and use Kerdi so that your installation is as waterproof as possible.
Billy
The restriction on electric radiant in a shower is that the power source to the elements is dropped to 24 volts VIA transfomer.
FWIW, I've done a couple of those and the transformer adds about $200 to the materials cost.