They may use Particular 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 identical way, as well as joints in between boards sealed with stress-delicate tape or glass cloth and mastic. https://freeecogrants.co.uk/tips-to-design-the-insulation-for-your-home-with-free-eco-grant/