How does Polyurethane spray foam insulation compare to Polystyrene insulation, i.e. why choose foam instead of Polystyrene?
A. There are some fairly serious problems associated with Polystyrene insulation for boats these are: •Polystyrene is not normally stuck to the steelwork of a boat it is just wedged between the timbers. •Twice the thickness of Polystyrene is required compared to foam to ensure adequate insulation. This can reduce space in what is usually a small area anyway. •DIY Polystyrene insulation can be a lengthy business, and there is the risk of error (i.e. bridging problems) for the amateur, together with the cost of the materials. If done by an expert, then the cost differential may be less than imagined. In both cases there is the risk of dissatisfaction and hidden cost. •Difficulties surround the location of suitable adhesives for Polystyrene. •Negligible fire retardant properties – if any? •Questions of longevity – how long will it last? •Polystyrene – Labour and effort required to create and fit the extra protective cases for cables. (I.e. cables must not lie next to the Polystyrene). •So
