Insulation: What Is Best?

Spa Pool LeakWhen it comes to spa insulation people are often confused – You have foam filled, closed cell foam, perimeter insulation, cabinet insulation, etc….

There are a couple of things to consider. The first being where are you situated? Are you in Australia where temperatures in Summer can reach 40+ Degrees and drop to 0 degrees in winter? Or do you live in Canada? Where Summer is usually 30 Degrees and winters can reach -20 degrees?

In Australia what you are after is a Balance enough insulation to keep the spa efficient in winter and not too much insulation so that you don’t have a hot spa in summer!

OPEN Foam Insulation:

This is probably the cheapest way of insulating the spa. The major problems with open foam:

  • •Open-cell foam is soft – like a cushion
  • •If you have a leak, how would you know where it was leaking from?
  • •If the foam get wet it goes mouldy and can be a breeding ground for bacteria and bad odours.
  • •Does the warranty include cutting away the foam to find a leak.
  • •After fixing a leak will they re-foaming the shell? ALL ON SITE?
  • •In summer time will your spa pumps be able to breath or will they die on a hot day?
  • •Are the spas being Sold TRIED and tested in AUSTRALIA?

The cell walls, or surfaces of the bubbles, can easily be broken waterfills all of the spaces in the material.  This makes the foam soft or weak, as if it were made of broken balloons or soft toy rubber balls.  The insulation value of this foam is related to the insulation value of the calm air inside the matrix of broken cells.

I would Personally Avoid AT ALL COST OPEN Foam filled spas.

Closed Cell Insulation:

Closed-cell foam has varying degrees of hardness, depending its density. Usually It is strong enough to walk on without major distortion. Most of the cells or bubbles in the foam are not broken; they resemble inflated balloons or soccer balls, piled together in a compact configuration. This makes it strong or rigid because the bubbles are strong enough to take a lot of pressure, like the inflated tires that hold up an automobile. The cells are full of a special gas, selected to make the insulation value of the foam as high as possible.

These are very good on Spas and give increased strength to the spa shell. However the downside is that the heat the pumps produce under normal operating conditions are lost since closed cell does not transfer the heat in winter time.

Perimeter Insulation:

Perimeter Insulation is attached to the cabinet of the spa instead of the shell. This allows any excess heat from the pumps and other equipment to be trapped around the spa shell, reducing heat loss and running costs and reduces the noise significantly also.


Its a Tie between closed Cell and Perimeter insulation. AS long as the Closed cell insulation is NOT covering any Pipes or jets then they are safe and the determining factor would be you actual area but either of this 2 is best.

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