Multifoil Loft Insulation Installation in Brantham This Multifoil project took an existing loft in Brantham to new levels of energy-saving effectiveness and efficiency. Firstly, we installed the OSB Boarding to the joists. Then, we installed Multifoil SF40 to the pitched part of the roof, finishing with an aluminium ladder.The customer was extremely impressed by our efficiency, professionalism, cleanliness and timeliness when it came to our visits and inspections of his property.