They could also use Unique weld pins with integral-cupped head washers. Unfaced boards can then be completed with bolstered insulating cement, canvas, or weatherproof mastic. Faced boards is often installed in the exact same way, along with the joints concerning boards sealed with strain-sensitive tape or glass cloth and mastic. https://freeecogrants.co.uk/tips-for-insulating-your-wales-home/