Experimental And Whole Life Study Of The Performance Of Proprietary Renders


Tests were carried out on rendered test samples to determine their adhesion bond strength, resistance to water penetration and freeze/thaw durability.  The performance of four proprietary ready-mixed dry renders was compared to a typical site-mixed render. The main findings are that the proprietary renders showed: increased bond strength, but more variation in individual results; reduced water absorption; and greater durability under laboratory freeze/thaw conditions.  It is clear that proprietary render  products can give improved performance when compared to site-mixed renders.  A questionnaire survey has produced cost and design life data for use in whole life models of proprietary render.  The main maintenance requirement of proprietary renders relates to appearance (e.g. cleaning).  This is likely to be required at a maximum interval of five years.  Other maintenance requirements are likely to be needed at ten year intervals (e.g. patch repairs, crack filling).  8 refs.

Primary author(s): Stupart A W

                            Building Research Establishment

Source: Masonry (9). Proc.6th Int.Masonry Conf.

            London,4-6 November 2002,p.465-470

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