Insulations for ground domestic water tank
Insulations for ground domestic water tank
(OP)
Hi
In my current project there is pretty large ground domestic water tanks plan dimensions 60' by 35' and 5' deep.
It is made of reinforced concrete with water proof admixture.
My question is regarding the internal water insulations that should be placed.
For now There is only epoxy coating shown in the drawings.
But shouldn't be some water tight membrane fixed into inside surface?
Regards
In my current project there is pretty large ground domestic water tanks plan dimensions 60' by 35' and 5' deep.
It is made of reinforced concrete with water proof admixture.
My question is regarding the internal water insulations that should be placed.
For now There is only epoxy coating shown in the drawings.
But shouldn't be some water tight membrane fixed into inside surface?
Regards






RE: Insulations for ground domestic water tank
RE: Insulations for ground domestic water tank
Coating (even epoxy)-Waste of money
Leak resistant structures are dependent on waterstop details, limiting pour areas, limiting water to cement ratio, proper reinforcing and skilled labor. As much as admixture representatives and coating salespeople give you the hard sell, they're not necessary.
RE: Insulations for ground domestic water tank
RE: Insulations for ground domestic water tank
JedClampett where should I start :)?
Contractor is having pretty poor workmanship and quality control isn't much of his interest. Mix was pretty stiff with 2 inch slump and tank walls are only 8 inch thick.
There is only one construction joint below water level (Just above base slab) and it has the required water-stop.
Anyway, from your responses the external wall surface water proofing required by drawings seems to be sufficient "Although there may be walls reinforcement corrosion in the long term".
I appreciate your inputs
Regards
RE: Insulations for ground domestic water tank
If it's too late to redesign, I would go with either a epoxy coating (OK) or a HDPE liner battened at the corners and top (best). Another choice is to live with the leakage. The trouble with the epoxy is that it will tend to crack with the concrete and transmit leaks and eventually corrode the reinforcing.
Battened liners are pretty cheap (~$2.00 a square foot?) and effective.
RE: Insulations for ground domestic water tank
RE: Insulations for ground domestic water tank
RE: Insulations for ground domestic water tank
Dear Jed I have googled about Battened liners and they seems great solution, but my manager isn't much interested telling me he always used epoxy internal coating.
@ cvg you are correct
In fact I had big fight with their manager, and mentioned it in today's meeting regarding that issue.
@ shobroco that is much logic but they are following the drawings.
Thanks again everybody
Best regards
RE: Insulations for ground domestic water tank
Another idea that is probably too late to implement is a leak test. We always require it. Contractor fills the tank, measures the level, waits for 24 hours and measures the level. You deduct for evaporation and figure it out. We allow .1%