Concrete storage tank

[sandiapaul]

After much back and forth I've decided on a poured in place concrete tank. The tank will be about 700 gals and roughly half of the volume will be below grade.

I have 2 questions for the group:
1. Where should my insulation be, outside or inside (or both)the tank?

2. Would one of the liquid EPDM products work as a sealant? Some are rated to 300 degrees. (broken link removed)

It does not say if this in at constant temp, and I would doubt that it is. The regular EPDM liner with its max temp of 175-180 scares me a bit...

Thanks,

Paul

 

[Nofossil]

IMHO, insulation belongs outside the tank. It must be kept dry to be effective. That may be a challenge on the outside of a buried tank, but it's much more of a challenge inside. Plus the dang stuff wants to float....

My worry about sprayed-on insulation would be their integrity if the concrete should develop a small crack. good question for the vendor. If it were me, I might do a belt-and-suspenders approach and do both spray-on and sheet EPDM.


You need more insulation than you think. If 6" is right for a house, you need at least 12" for a tank. The temperature difference is more than twice as great.