GA 4000 insulation board is one of the more versatile insulation boards we carry. Celotex insulation can be used in homes and businesses of most types, providing an effective barrier to heat loss at the same time as assisting ventilation and moisture control. Our choices include: insulation board 100mm; and insulation board 50mm. If you need good-quality insulation board, Celotex is a premium answer that's also competitively priced. Save even more with our economical mainland UK delivery.