Is heat sealing the inner wrapping important?
The most common cause of spa cover failure is due to the foam cores absorbing moisture. Besides the moisture causing the cover to gain excessive weight, the saturation also greatly reduces the insulating ability of the cover. One of the most important features of an insulating is the vapor barrier surrounding the foam. Not only is the type of material and it’s thickness important, but how it’s sealed is also important. The simplest way to seal the foam is to simply wrap it in plastic sheeting and tape it closed. Unfortunately the tape will fail rather quickly thereby allowing moisture to penetrate into the foam. The preferred method for sealing the plastic sheeting is to properly heat seal it. Special care must be taken when heat sealing, otherwise failure can occur prematurely. Just the right temperature must be applied to the plastic sheeting to achieve a proper seal. Too hot and it will become brittle and crack open, too cool and it wont remain sealed. The ideal temperature will lit
