Full foam insulation is not always best
While many hot tub manufacturers brag about the fact that their tubs have full foam insulation, not all foam is created equally. Closed cell foam will be a nightmare for future repairs so you need to ensure they use a quality open cell foam that won’t harden over time
While many hot tub manufacturers brag about the fact that their tubs have full foam insulation, not all foam is created equally. Closed cell foam will be a nightmare for future repairs so you need to ensure they use a quality open cell foam that won’t harden over time.
We have long sung the praises of full foam insulation in hot tubs as the most efficient for energy consumption as well as the healthiest system for longevity of your equipment. However, beware that there are two types of full foam and they are most certainly not equal. While open cell foam retains its R-value and does not soften over time, closed cell foam will harden to almost the texture of concrete over time and lose a portion of its R-value. If there is a leak in a hot tub with closed cell foam, it will be extremely difficult to even isolate the leak, much less repair it. The closed cell foam get so hard that it must be chipped away with a screwdriver or even a hammer and chisel in order to access any of the plumbing components for repair.
Many manufacturers who make Inexpensive, weak shells will use closed cell foam to strengthen the shell short term, it’s a cheap band-aid approach to making a reliable long lasting shell and it allows that tub to be sold for $1500 cheaper than a well made expensive shell. The really bad thing for you is going to be the huge repair costs down the road because a simple leak in the field can cost as little as $250 to repair on an open celled foam system, but on a closed cell foam they can be 10x that. Often the tub has to be elevated and ran full of water which usually means taking it to a repair facility!!! This is one on the biggest things to avoid in a hot tub purchase. Click on the image below to check out a video to see the difference between the two types of full foam systems.