BS 851188-1:2019 pdf download

BS 851188-1:2019 pdf download.Flood resistance products Part 1: Building products – Specification
1 Scope
This British Standard specifies requirements for the designation, testing, factory production control, installation manual, deployment instructions, user manual and marking for different types and configurations of flood resistance products. This British Standard is applicable to flood resistance products intended for use in the temporary sealing of building apertures and entrances to properties, including boards, skirt and wall sealant systems, and flood doors, in the event of static flood water rising above a minimum level of 540 mm above aperture threshold level, except where they are designed to completely cover or replace small apertures, such as airbricks or air vents. The flood resistance products are expected to be effective at flood heights from ground level to the designated maximum water depth (DMWD). It covers wall aperture closure systems and foam products. Skirt and wall sealant systems are used in the temporary sealing of the above or below ground external faces of buildings and properties. This British Standard specifies the method of testing and product performance. The range of building aperture sizes covered is a nominal width of up to 6 000 mm. For skirt and sealant systems the range of building sizes covered is governed by the system constraints, but theoretically the system could be installed to provide protection to any size of building. NOTE 1 The hydrostatic pressures exerted by floodwater can cause sudden or long-term structural damage and undermine the foundations of a building or cause leakage through the walls, floor or sub-floor, unless the building is specifically designed to withstand such stresses. Typically, residential buildings are not structurally capable of excluding flood water above 600 mm deep (see BS 85500 for guidance). The actual water level that can be safely retained by the external walls depends upon the construction, type, form, age and condition of the walls. It is advisable that an appropriately qualified building surveyor, civil engineer or structural engineer inspects the external walls, before any flood resistance product for building apertures is installed. NOTE 2 Flood resistance products are normally intended to prevent water more than 540 mm above the aperture threshold level from entering the building. An allowance of 60 mm has been assumed to allow for the aperture or entrance threshold against which the lower edge of the product seals. NOTE 3 The test conditions given in Annex A represent typical conditions that can be experienced during a flood. This includes testing the flood resistance product for leakage under static water levels, waves up to 0.1 m high and parallel currents up to 1.0 m/s.