In this chapter retained ground levels are taken from the top of the retained ground to the lowest finished floor level. the SOFT Plan, Sewer Optical Fiber Teleway Network Plan. This chapter includes guidance for walls, floors and foundations below, or near to, ground level that are intended to prevent the passage of water from the ground (including from sources such as run-off, burst pipes etc.) entering the building near to or below ground level. These are normally considered to be Type A, B or C as defined above. Water is removed from the cavity via a managed drainage system.Ī suitably qualified person co-ordinating the team involved in the design of waterproofing to basements and other below ground structures.Ī fully assessed and certified system of compatible materials and components used to provide waterproofing. Vertical walls exposed to the weather may be required to have 2,500 psi concrete minimum strength, on up to 3,000 psi, in some severe weathering conditions. In sloped, stepped, or tapered foundations, depth and location of steps or angle of slope shall be such that design requirements are satisfied at every section. The principles are applicable to other Type B systems listed in BS 8102.Ĭonstruction that incorporates a cavity, generally formed with a cavity drain membrane. For foundations and slabs, except for garages, the minimum strength of the concrete should be 2,500 psi. THE STRUT-AND-TIE MODEL OF CONCRETE STRUCTURES By Dr. According to ACI 318-19 section 13.3.1.2,overall depth of foundation shall be selected such that the effective depth of bottom reinforcement is at least 150 mm. This chapter provides specific guidance for the use of Type B concrete systems cast in-situ, with or without waterproofing admixtures. The water-resistant properties of the retaining structure providing waterproofing to the building. Type B structurally integral construction Post-applied sheet membranes are not considered to be fully bonded barriers for the purposes of this chapter.Ī sheet membrane applied to the completed structure typically with hot or cold adhesive. The wind loads may be neglected in designing the foundation unless caused loads on foundations exceeding one third of the load due to dead and live loads combined. Type A barrier that forms part of a composite structural wall, including liquid applied and cementitious systems. Excluding coverings such as carpet and tiles.Ī waterproofing barrier applied to the structural element being waterproofed, also known as tanking. The top surface of the lowest finished floor, including lift pit floors, car park surfaces and other similar surfaces.
Semi-flexible sheet designed to form a cavity that intercepts water penetrating the structure and directs it to a suitable drainage point.įor the purposes of this chapter, a combined system includes:Ī barrier used to resist the ingress of moisture and/or ground gases into the building.