They may also use Distinctive weld pins with integral-cupped head washers. Unfaced boards can then be completed with bolstered insulating cement, canvas, or weatherproof mastic. Faced boards might be set up in the same way, as well as joints amongst boards sealed with stress-delicate tape or glass fabric and mastic. https://freeecogrants.co.uk/how-to-save-more-energy-in-your-house/