Join Date: Sep 2008
Location: Victoria B.C. Canada
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Are you looking at buying a boat that is Airex cored or are you planning on building one. If buying it will depend on the specific manufacturer and how it was done. If building that is a different issue and there are many options including balsa which is stronger and not subject to heat deformation which the foam cores exhibit in a warm climate. The link I provided gives a good explanation of modern cores and shows test results of same. Here's a link to a discussion on Boat Design Forum about Airex vs others.
Airex and any foam based hull materials - Boat Design Forums
Living aboard in Victoria Harbour