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For a design project, we’re looking to use XPS foam boards that are 5cm thick (15 cm wide strips) to support the underside of a bath without legs or wall fixtures, but a supportive frame at each end.

The bath is steel enamel with a slightly curved underside and will be supported by 4 layers of XPS.

Will the XPS foam be able to withstand this kind of pressure with regular use?

Intuitively, we were thinking several thicker boards would be superior in terms of pressure resistance rather than many thinner boards, but please advise otherwise if this is incorrect.