They could also use Specific weld pins with integral-cupped head washers. Unfaced boards can then be concluded with strengthened insulating cement, canvas, or weatherproof mastic. Confronted boards is often put in in the same way, along with the joints concerning boards sealed with pressure-sensitive tape or glass material and mastic. https://freeecogrants.co.uk/4-ways-to-spot-the-best-home-insulation-company/