Profile: Ashmead Building Supplies Ltd. specializes in the supply of building materials. Our product line includes timber and sheet materials, sand & aggregates, drainage, landscaping & structural products, tools & ironmongery. Our twin-wall pipes are made from recycled plastic and are a strong but lightweight option for storm & surface water drainage & it is available with an outer ribbed profile & inner bore which provide a effective alternative to concrete land drain pipes. Our pre-stressed concrete lintels can be used on inner and outer walls of buildings.