If you miss more than one of the questions below, your job is
at greater risk of an installation failure. Keep up-to-date
with the latest technology and cost saving techniques.
Waterproofing,
Crack Isolation, and Motar Shower Bases
Is a cleavage membrane waterproof?
ANSWER. Not always. A cleavage membrane
serves to separate the installation from the substrate.
How high over the curb
should the waterproof membrane extend?
ANSWER: 3" over the finished curb.
What is the recommended mix ratio of sand and cement for shower
floors?
ANSWER: 4 to 1 with a water
resistant additive
What is the proper pitch under a shower pan?
ANSWER: 1/4" per foot under Universal
Plumbing Code and ANSI A108
What is the difference between a vapor barrier and vapor retarder?
ANSWER: A barrier has a perm rating
less than 1
Most adhesive applied membranes may fail if the pH level of
the concrete is how high?
ANSWER: 9 is the typical limit of most
adhesives
What are weep holes and what must be done to assure they work?
ANSWER: Weep holes allow for drainage
in the sub-drain in showers and possibly other areas. They
must remain unobstructed.
Are all waterproof membranes rated for submerged?
ANSWER: No, they are not.
If something has a perm rating of less than 1, what is it?
ANSWER: Waterproof.
What’s the difference between a PVC and CPE membrane?
ANSWER: CPE is chlorinated and remains
flexible. PVC contains plastizers and may become brittle.
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