Our low growth foam is designed especially for window and door installations. It expands to fill voids that fibreglass batt insulation might not successfully access. Contrary to fibreglass, foam acts a vapour barrier that seals openings/gaps and decrease leakage. Stuffed into gaps, compressed fibreglass insulation loses its insulating worth. From https://chancescfhj.blogoxo.com/32303610/the-best-side-of-windows-companies-in-keswick-ontario