Current trends in building defects relating to the fabric of a building, its cladding and structure
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Andrew Tee is Technical Director of CNP Ltd. Previously he was Head of the Building Engineering and Technology Group at Watts and Partners and prior to this, a Director of Quest Technical Services. He is a chartered engineer specialising in building defect analysis and specialist investigations associated with structure, curtain walling and cladding, general fabric defects and deleterious materials. A particular focus of his work is the presentation of often complex technical issues in a concise and commercial manner. Much of his work during the past ten years has been for building surveyor or investor/developer clients. He has acted as Expert Witness in matters relating to built-up roofing, dampness, condensation problems, general fabric disrepair and woodwool slab shuttering. He has also lectured widely at in-house training seminars to building surveyors, at CIRIA and Henry Stewart Conferences, and the Building Surveyors National Conference.
Abstract This paper is an update on many commonly known and established building defects where there may be a new view or revised thinking. It is also an update on new construction and the particular defects that may occur. The topics covered here are not necessarily an exhaustive list of all present-day problems with either existing or new buildings, it is merely a summary of those issues that appear to be particularly topical. These notes particularly relate to defects with commercial buildings as it is the author’s experience that there appears to be more change in this field compared to residential properties. The paper is presented as a series of problems relating to the fabric of a building, its cladding and structure.
Keywords: steel-frame corrosion, composite cladding, cladding interfaces, rainscreen cladding, curtain walling stick systems, nickel sulphide, solar-glazing films, floor vibration, hollow-pot floors, woodwool, industrial slabs, multi-storey car parks, HAC, concrete problems
FABRIC PROBLEMS Andrew Tee CNP Ltd Warwick House, Claremont Lane Esher KT10 9DP, UK Tel: þ 44 (0)1372 466445 Fax: þ 44 (0)1372 466332 E-mail: [email protected]
Steel-frame corrosion ‘Regent’s Street Disease’ is the commonly used term loosely applied to the corrosion of steel framework and the consequent disruption to masonry/stone fac¸ades where they are built tight to the steelwork.
HENRY STEWART PUBLICATIONS 1744-9545
Journal of Building Appraisal
VOL. 1 NO. 1
PP 81–92
81
Tee
Regent’s Street Disease is common to steel-frame buildings constructed in the 1920s and 1930s. Corrosion of steelwork is an electrical chemical process set up on the surface of the steel by contact with either other metals or usually by local variations in the steel itself. An electrical chemical cell is formed with an anodic cell, which corrodes, and a cathodic cell, which is protected. The corrosion cell is completed by an electrolyte, ie moisture, allowing the flow of positively and negatively charged ions. As rust forms on the surface of steel, it becomes cathodic, thus inducing the remaini
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