They might also use Unique weld pins with integral-cupped head washers. Unfaced boards can then be completed with strengthened insulating cement, canvas, or weatherproof mastic. Confronted boards is usually installed in precisely the same way, as well as joints between boards sealed with strain-sensitive tape or glass material and mastic. https://freeecogrants.co.uk/how-to-increase-your-property-value-by-applying-for-eco-grants-uk/