They might also use Distinctive weld pins with integral-cupped head washers. Unfaced boards can then be completed with strengthened insulating cement, canvas, or weatherproof mastic. Faced boards may be set up in exactly the same way, plus the joints involving boards sealed with force-sensitive tape or glass fabric and mastic. https://freeecogrants.co.uk/simple-steps-to-apply-for-an-eco-grant/