H & H International 

H+H International A/S produces and sells autoclaved aerated concrete and calcium silicate building blocks used for wall-building and pre-cast wall-panel solutions in the United Kingdom, Central Western Europe, and Poland. It offers elements and partition walls; foundation blocks; high-insulating blocks; and a range of traded goods. The company's products are used primarily in the residential new building segment. It serves housebuilders and builders' merchants. H+H International A/S was founded in 1909 and is headquartered in Copenhagen, Denmark.