They could also use Distinctive weld pins with integral-cupped head washers. Unfaced boards can then be finished with strengthened insulating cement, canvas, or weatherproof mastic. Confronted boards is usually installed in precisely the same way, and the joints in between boards sealed with strain-delicate tape or glass material and mastic. https://freeecogrants.co.uk/how-to-apply-for-solar-energy-grants-uk/