HELP! He did not hot mop!

[slinkywebo]

Hi-

I have been working on a bathroom remodel. I asked the contractor to hot mop the second story bathroom. He put down tar paper, a layer of Henry's, and a plastic sheet. Is that enough to prevent leaking? Do I need to demo the floor, hire a hot moper and redo the floor?

[jadnashua]

Hot mopped showers are a regional thing (mostly CA). It works, but the quality varies a lot between installers. They don't typically last as long as a conventional pvc liner shower.

There are more than a couple of ways to build a leakproof shower. It doesn't sound like you have one of them.

For shower contruction help, you'll get a lot more help at www.johnbridge.com. Friendly people, and very knowledgeable.

Whatever technique you use to build the shower, the waterproof layer must be on a slope (and the tile is a decorative wear layer, not the waterproofing layer). In a conventional shower, this means a layer of deck mud (a mix of cement and mostly sand) that is sloped to the drain. Then a pvc liner that is clamped to the drain and goes over the curb. Then another layer of deck mud, then thinset and tile. The liner needs to go up about 3" above the top of the curb, so in case the drain gets clogged (or you happen to stand on the drain), it will go out the curb rathe than behind the walls of the shower.

There are other ways to do a successful shower, but all of them have the waterproof layer sloped to the drain.

[jimbo]

What you describe is NOT to code or any kind of standards. A wet area...shower.....needs 3 layers of felt and HOT asphalt.

[hj]

I find tar paper shower pans when I have to repair shower leaks. I cannot imagine ANYONE still installing them, hot mopped or otherwise. But I cannot imagine the installer bringing a tar bucket to a job for a just a shower pan, either.

[jadnashua]

I find tar paper shower pans when I have to repair shower leaks. I cannot imagine ANYONE still installing them, hot mopped or otherwise. But I cannot imagine the installer bringing a tar bucket to a job for a just a shower pan, either.

From what I understand, this is quite common in southern CA. Lots of people willing to work with the hot, smelly tar for relatively cheap. It's fast.

Personally, I'd be leery, but there apparently are a lot of them there.

[hj]

There were a lot of them here in the 60's and 70's also. Most have either been replaced already, or are still leaking.

[Pan Man]

Most people in Ca prefer a 3 layer hot mop with a protective top layer over any other liner especially a over a loose, bulgy, rounded corner, pvc liner that is prone to punctures by other contractors using them as trash cans.....

[hj]

Fold and place the liner properly, and do not install it until the tile is about to be installed, and you will eliminate ALL of those problems.

[Pan Man]

Sounds easy....what if there's a seat? How do you stick it to the wood and create a sufficiant splash to tie into properly? What if the shower is round? If it's a large pan do you just glue two pieces together hoping your seem is water tight?