- Door Installation/Replacement
- New Construction
- InsulationPolyurethane or known as expanding foam is used in most all imported decorative iron doors. This type of foam has several drawbacks in both the short and long term. Polyurethane foam expands quickest at the openings closing air flow to the rest of the tube, air is needed in order to expand properly and cure. As in the case of this photo (far right) you can see that the foam did not fully expand and a large void in the insulation has formed due to the lack of air flow.