SEAL THE JOINT: The joint between window frame and the wall is susceptible to water leakage. Be it PVC, wood or aluminum windows, the gap between the wall or the window frame constantly keeps changing [expanding and contracting] due to differential expansion coefficient of the two materials. Some contractors are aware of this perennial problem and seal this gap with silicon sealers at the time of construction. They insert a thin nylon rope inside the gap at about 0.5 inch depth from the outer surface and fill up the balance space with silicon sealer. At times the final finish is further covered with a silicon tape for neatness of the final result. When completed with tape etc…the final product would look and feels like common rubber beading.
Don’t worry if you can’t see this sealant in place you could always replicate the process yourself. Open the window and inspect carefully the wall-window junction. Thin hair line crack on the outer plaster joint is all that water needs to seep inside the house. Ask the vendor to scrape out this thin layer of plaster at the junction and widen the gap. Make sure this shallow groove at the joint of window frame and wall is dry and dust free. Silicon sealant tubes are easily available at most hardware shops and are reasonably inexpensive.
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Navneet Malhotra is a perpetual student. His passion to design and his deep rooted desire to demystify Indian construction system has seen him as a visiting faculty member with S.P.A.-Delhi for over 8 yrs. He has also authored several ‘How-to’ articles as well as regular 'Q&A' section for ‘Better Interiors’ magazine,. B-Arch [S.P.A.-D], M-Tech [I.I.T.-D]