Cement which is used for vertical cladding does not have high adhesion strength.
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As cement is rigid material it does not accommodate physical movements due to extreme temperature changes in external cladding.
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Cement has tendency to shrink which leads to debonding.
Solution:
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Roff STA / Roff HDC Base + Binder which are heavy duty polymer modified cementious powder + External polymer adhesive system provides extra strength & flexible bond between tile / stone & substrate.
