They could also use Particular weld pins with integral-cupped head washers. Unfaced boards can then be concluded with strengthened insulating cement, canvas, or weatherproof mastic. Confronted boards could be set up in a similar way, and also the joints between boards sealed with strain-sensitive tape or glass material and mastic. https://freeecogrants.co.uk/how-to-insulate-your-home-by-applying-for-the-grants-in-uk/