Multifoil Loft Insulation Installation in Westbury Tom contacted RJ Insulation as his loft had very little insulation and became uncomfortably warm during the summer. Wanting to improve energy efficiency while keeping his existing loft boarding in place, we recommended multifoil insulation. Our team installed multifoil insulation to all the roof rafters and gable ends, carefully taping every joint and ensuring adequate ventilation behind the insulation for long-lasting performance and year-round comfort.