Elevated Floor Slab and Moisture Infiltration Concern

Structural Joe · May 2, 2025

In my experience, a boiler room elevated slab designed with an integral drainage trench should absolutely have a waterproofing membrane and topping slab.
...Well, I've inherited a 90% design (read: the previous engineer was fired late in the game) and I am not seeing any membrane. Room below is interior storage. Anyone out there who can confirm my concerns or tell me that I have nothing to worry about? TIA

jayrod12 · May 2, 2025

I'm assuming the previous engineer was fired for a reason. Therefore tell the client your opinion on the matter. I agree with you that there should be some form of membrane. That opinion is based on having seen situations where a leak in the boiler room equipment causing damage to rooms below the boiler room.

JAE · May 2, 2025

Could be some kind of traffic-bearing membrane like Peda-Gard
(see here: https://www.neogard.com/coating-systems/traffic-coating-systems/peda-gard-systems/peda-gard)

jhnblgr · May 3, 2025

Shouldn’t a good sealer or epoxy floor coating provide protection?

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Elevated Floor Slab and Moisture Infiltration Concern

Structural Joe

Structural

jayrod12

Structural

JAE

Structural

jhnblgr

Civil/Environmental

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