Modern caravan floors and walls are made of sandwich construction. The floors are constituted of upper and lower sheets of thin plywood bonded to a styrofoam core, while the walls comprise the outer aluminium and the inside wallboard bonded to a plystyrene core. If the bond breaks down delamination takes place. This is more likely to happen to the floor, which then feels spongy. The obvious sign of wall delamination is the aluminium panel bulging outwards. Both forms of delamination can be effectively cured using a specially-formulated epoxy resin.
This sort of repair should not be attempted by anyone, other than a qualified, experienced caravan repairer. The resin, if used incorrectly, can cause irreversible damage to your caravan
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