Our Silver & Super Silver beads are accredited by KIWA and NSAI as having the best thermal properties (lambda 0.032 w/m2k) in the UK & Irish markets. The product maintains the function of the cavity wall by allowing the wall to breathe and water to drain away. Approved for all exposure areas. The bead and bonding agent are delivered to site and installed by our factory trained technicians who carry out he installation in accordance with our BBA & IAB certificates. 5/2/2020 Just wanted to say how pleased we are with our loft insulation.