Sobre el papel no sólo aislante, si no también estabilizante, del poliuretano inyectado en fachadas, nuestros compañeros de UK nos dejan este post: "Cavity wall stabilisation"

http://optimalinsulation.com/isolation/cavity-wall-stabilisation/

Spray insulation is used to restore the structural stability and reduce the thermal transmittance of existing cavity walls in which the conventional wall ties have corroded. It is also used in new construction where the better thermal performance helps meet the requirements for the code.