Building with PU instead of cement.

Title: Masonry Construction using Single-Component Polyurethane Foam and Foam-Core Blocks

 Number: US2012247061

Publication date: 4-10-2012

Applicant/Assignee: CALMAR HOLDINGS LLC

Gist: Mortar-free masonry wall construction using (off the shelf) one component PU rigid foam.

Why it is interesting: Apparantly using PU instead of Portland cement-based mortar results in walls with a higher tensile strength.  This is useful during construction (when walls can be easily blown over by wind) or for prefab systems where wall elements have to be lifted and transported. The idea is not new.  The only major difference with the prior art being that this case claims one component moisture curing systems. Prior art US20050096411 was not granted and was continued in US20110016814.      

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