They might also use special weld pins with integral-cupped head washers. Unfaced boards can then be completed with reinforced insulating cement, canvas, or weatherproof mastic. Confronted boards can be set up in precisely the same way, along with the joints amongst boards sealed with tension-sensitive tape or glass fabric and https://freeecogrants.co.uk/how-to-apply-for-loft-insulation-in-the-uk/