NHBC has accepted H+H UK’s storey height elements as an MMC (modern methods of construction) system for wall construction.H+H’s storey height elements, which volume housebuilder Barratt has used to build around 600 new homes, has become one of more than 40 systems that NHBC recognises as MMC.The elements, which are usually used with Roofspace’s I House system, are for the …