All Hanson water storage tanks are offered with optional spray-on polyurethane foam factory insulation with topcoat. Nominal “R” value is R-16 @ 2″ thick. This exceeds ASHRAE requirements.
Hanson factory insulation is a 2 component HCFC blown, polyurethane spray foam system. The foam is rated CLASS I according to ASTM E-84 at two inches, flame spread index 25 with 345 smoke developed.
The product is designed for use in applications where the stringent requirements for a Class I system must be met. Its outstanding physical properties result in exceptional fire resistance.
(Information taken from the manufacturer’s product information and subject to change without notice)
Foam insulation is applied at ambient temperature, nominally 70° F or more and curing continues for several more days. This is accelerated by extra heat, notably during system startup. The bond of the foam to the tank is also affected and the combination of the reactivated expansion of the foam and the weakened bond can lead to blisters forming in some cases. To avoid this, it is important to bring the tank temperature up as slowly as possible, giving pressure in the closed cell foam time to dissipate. Once fully cured, there should be no further problems. Make sure that the topcoat is good condition, it can be touched up with white roof coating if necessary.