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Old 04-24-2013, 04:48 PM   #1
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Shower water proofing


Hello,

For waterproofing a shower wall I want to run this by you guys to see if I am correct. If the shower is on an outside wall I would put insulation behind the plumbing and a vapor barrier like 6mil poly in front of the plumbing. I plan on putting up half inch cement board and kerdi on top of that. Now, if I put up kerdi over the cement board would that be considering a double vapor barrier since I already have poly up?

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Old 04-24-2013, 08:09 PM   #2
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Yep--the plastic is not needed with a waterproofed board--like Kerdi ---

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Old 04-24-2013, 08:11 PM   #3
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Shower water proofing


if you can avoid faucet on outside wall....do it ...we never install faucets on outside walls....unless there is no other way..ben sr
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Old 04-24-2013, 09:21 PM   #4
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if you can avoid faucet on outside wall....do it ...we never install faucets on outside walls....unless there is no other way..ben sr
Am I correct with my description though? Would adding the kerdi on top of the cement board be a double vapor barrier?
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Old 04-25-2013, 04:24 AM   #5
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Yes, that is a double vapor barrier----
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Old 04-25-2013, 05:58 AM   #6
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mike already answered that question....ben sr
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Old 04-25-2013, 07:52 AM   #7
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Yes, that is a double vapor barrier----
what do you think would be better? The poly over the studs or the kerdi over the cement board?
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Old 04-25-2013, 09:13 AM   #8
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mike already answered that question....ben sr
Hey Ben,

Is it normal to see stack vents in a normal house or just the vent stack which is part of the waste stack? Reason I ask is because if you have a 2 story home you dont want to be vet venting fixtures that are on the first floor so you would have to re-vent the first floor fixtures up and over the 2nd floor. Other choice would be separate stack vent for those first floor fixtures, right? Do you ever see more than one Waste/Vent stack in a house when fixtures are just too far apart?
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Old 04-26-2013, 07:37 AM   #9
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Yes, that is a double vapor barrier----
what do you think would be better? The poly over the studs or the kerdi over the cement board?
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Old 04-26-2013, 10:01 PM   #10
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I always waterproof the surface of the board---Hydroban by Latacrete is my choice---

If the walls are completely waterproof---there is no way for the inside of the walls to get wet---

Many use the Schluter products----But I prefer the paint on----but both are great---
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Old 04-26-2013, 11:12 PM   #11
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I always waterproof the surface of the board---Hydroban by Latacrete is my choice---

If the walls are completely waterproof---there is no way for the inside of the walls to get wet---

Many use the Schluter products----But I prefer the paint on----but both are great---
So, the kerdi acts as a vapor barrier just like the poly sheeting so moisture doesn't enter the framing and condense and cause issues?
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Old 04-27-2013, 06:10 AM   #12
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Yes----the Kerdi is your vapor barrier---If the wall is insulated--use unfaced or slash slits into the facing----
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Old 04-27-2013, 10:53 AM   #13
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Do you ever see more than one Waste/Vent stack in a house when fixtures are just too far apart?
Yes. It could be a waste of plumbing materials and labor to try and put everything into one vent. That and there are formulas associated with distances and number of fittings. As in, the more you pull through the pipes, or the more you turn them, the greater the size of the pipe is that's needed. At certain points it doesn't make sense to trying to combine too many things.
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Old 04-27-2013, 01:19 PM   #14
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Yes. It could be a waste of plumbing materials and labor to try and put everything into one vent. That and there are formulas associated with distances and number of fittings. As in, the more you pull through the pipes, or the more you turn them, the greater the size of the pipe is that's needed. At certain points it doesn't make sense to trying to combine too many things.
I know a trap needs to be within 5 feet of a vent. When you wet vent fixtures the drain that is serving as the vent of another fixture has to be one size larger, right? When you have a multi story house or building they usually a stack vent which is completely dry and can terminate through the roof or meet up at the main vent stack, right?
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Old 04-27-2013, 01:25 PM   #15
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I know a trap needs to be within 5 feet of a vent. When you wet vent fixtures the drain that is serving as the vent of another fixture has to be one size larger, right? When you have a multi story house or building they usually a stack vent which is completely dry and can terminate through the roof or meet up at the main vent stack, right?
But the better question is what configuration is it you want to set up, and why?

Theories are great, and important to understand, but not without proper context.

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