They also can use Particular weld pins with integral-cupped head washers. Unfaced boards can then be completed with reinforced insulating cement, canvas, or weatherproof mastic. Faced boards may be set up in the same way, and the joints in between boards sealed with tension-delicate tape or glass fabric and mastic. https://freeecogrants.co.uk/tips-for-insulating-your-wales-home/