Plastering Poses Problems Even For Experienced Contractors
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Company Announcement - The Concrete Institute has among its extensive list of publications two leaflets which deal with plaster problems which counts among the most frequent technical inquiries received by the Institute. Bryan Perrie, managing director of The Concrete Institute, says even experienced building contractors are not always sure how to evaluate acceptable plastering, mainly as a result of years without formal standards or regulations covering plaster quality. “This makes it difficult for home-owners and other clients to force a contractor to make repairs,” Perrie states.
In addition to the tuition in plastering provided by The Concrete Institute’s School of Concrete Technology in its regular courses, the Institute also publishes two free leaflets with detailed guidelines on plastering:
• Successful Plastering provides the technical information necessary to ensure that plastering is done correctly. It deals with selecting materials (including assessing the suitability of sands), calculating mix proportions, and provides instruction for the preparation of the surface of various substrate before the plaster is applied;
• Common defects in plaster discusses how to assess if a plastering job is acceptable and covers the most common defects in this part of the building process. The leaflet includes advice on structural and non-structural cracking, debonding, lack of hardness, grinning (when mortar joints are clearly visible through the plaster), expansion and popping. The causes and repair method for each problem are discussed.
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