ABSTRACT

Vertical ducts usually extend the full height of a building which is an important factor when considering the potential for spread of fire. Raised flooring provides discrete housing for the huge volumes of data and telecommunications cabling, electrical power cables, pipes, ventilation ducts and other services associated with modern buildings. Water, gas and electrical services can be easily accommodated horizontally below timber and other wood product boarding by securing pipes and cables to the side of support joists. The structure and its components should not be damaged to accommodate services but some nominal holing and notching will be unavoidable and is acceptable. The extent of contribution can be determined by reference to Appendix A in Approved Document B of the Building Regulations. Manufactured timber joists/beams are frequently used in house construction as an economical alternative to standard timber sections. The purpose of a service duct is to conceal the services without restricting access for inspection, repair and alterations.