They might also use Unique weld pins with integral-cupped head washers. Unfaced boards can then be completed with strengthened insulating cement, canvas, or weatherproof mastic. Confronted boards can be set up in the exact same way, and the joints among boards sealed with strain-delicate tape or glass material and mastic. https://freeecogrants.co.uk/what-are-the-factors-to-check-before-applying-for-the-free-insulation-grant/