They could also use Specific weld pins with integral-cupped head washers. Unfaced boards can then be completed with bolstered insulating cement, canvas, or weatherproof mastic. Confronted boards may be installed in the exact same way, and the joints in between boards sealed with pressure-delicate tape or glass fabric and mastic. https://freeecogrants.co.uk/why-should-you-apply-for-eco-funding-first-time-central-heating/