Insulating 1500 Gallon Outdoor Water Tank – Customer Project in the Arizona Heat
This entry was posted on March 31, 2017.
A big thanks to T.A for sharing a picture of his water tank insulation project. T.A contacted us looking to insulate a 1500 gallon water tank that was purchased at Tractor Supply. The tank sits exposed in the Arizona heat and is used for drinking water. Here’s the excerpt from our contact us page.
Comment: have a 1500 gal. water tank, from tractor supply Co. need a wrap for it to reflect the AZ sun so it will not get to hot. any suggestions? I use it for our drinking water. Can you help me? thanks T.A
We recommended our InfraStop double bubble insulation in conjunction with using spacer strips to keep an airspace between the tank and the insulation for the optimal install. A similar application is insulating hvac ducts by wrapping the duct with 2” wide strips of double bubble and then wrapping the duct and spacers with the roll of insulation.
T.A sent this image back of his insulated water tank. Nice work, looks great! When asked what he did for spacers, here is his reply.
“went to Walmart and got the white foam,3/8 in thick used for sending packages. Comes in rolls or sheets and cut them in 2 in. strips and spaced them about 4 ins. apart and used the tape to hold it in place. Put them in up and down and made sure that they were resting on the slab. Did it my self but took a long time. if I do it again will have someone to help me here in the AZ heat at 95. I am 73 years young, a Vet and in good shape for the shape I'm in. LOL”
Thanks again, T.A. We really appreciate the picture and sharing your project.
A couple notes about why we recommended spacers. 1. The use of spacers will increase the r-value by utilizing a trapped air space. Again, in HVAC insulation, the r-value increases as spacers are used in the assembly. You can see more information on insulating ductwork. 2. In addition, the airspace also allows the emissive properties of the material to work. This means the inside reflective layer of the insulation, the side facing the spacers and water tank will only emit (the emissive value is opposite of the reflective value) 5% of the radiant heat that could pass through from the outside sun.
This is a bit technical but basically you have an effective radiant barrier blocking 95% of radiant heat on both sides of the insulation in this instance.