PlastaBlock is a polystryene (Masons XRV) block system that will provide an R-Value of 1.0 whereas 20 mm of insulating plaster will provide only 0.2 R-Value, yet the cost of both are very similar.
Since a few years tougher thermal performance standards apply to all new houses and buildings. The most difficult buildings to insulate are masonry. The insulation properties of the 40 mm EPS sheet will produce an R-Value of 1.0, which will exceed the building code changes.
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