Equipotential Bonding when using a waterproofing (hydroban)?

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Brant

Well-known member
Jan 25, 2024
177
Boerne Texas
Recently finished a build and Waterproofed the entire shell with hydroban cementitious.

I started thinking today about equipotential electrical bonding and came across this...
  1. For Pool Water Bonding required by NEC Article 680.26(C), concrete pools are considered conductive (refer to 680.26 (b)(1) due to the porosity of concrete and the bonding of rebar. No additional bonding is required. Vinyl liner and fiberglass composite shells are considered non-conductive and require a water bond.
It got me thinking about the waterproof coating that we applied and whether that would defeat the bonding of the pool water.

I did install one bonded skimmer but now I'm concerned about whether we have proper water bonding. This is a scary thought.

Anyone have expert knowledge on this matter and hydroban cementitious? I assume it will act as an electrical barrier the same as vinyl or other non-conductive material. If so, does the single bond on the skimmer suffice in making the pool safe?
 
ajw22 said:
Yes, a water bond at the skimmer is all that is needed.
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If I didn't have that bonded skimmer, would the waterproofing act like an electrical barrier?

I also have some brass chair anchor sleeves that were bonded and are exposed to water.

But if I didn't have the above, that's kinda a scary thought.

If this is the case, I've never read anywhere that waterproofing a concrete pool could block your water bond to shell. Seems like this is good info for people to know.
 
Brant said:
If I didn't have that bonded skimmer, would the waterproofing act like an electrical barrier?

I also have some brass chair anchor sleeves that were bonded and are exposed to water.

But if I didn't have the above, that's kinda a scary thought.

If this is the case, I've never read anywhere that waterproofing a concrete pool could block your water bond to shell. Seems like this is good info for people to know.
Click to expand...
I don’t think waterproofing is 100% perfect and water leakage and electron leakage are two different things.

While I understand your concern and it is easy to install an alternative water bond I would expect the NEC to have considered the use of waterproofing in pools.
 
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