Energy Swing Windows & Doors | Window & Door Encyclopedia | How important is the type of caulking used to install my windows?

INSTALLATION OF WINDOWS

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10. How important is the type of caulking used to install my windows? While most of us are very selective when it comes to choosing paint or wallpaper, few give the same thought to the caulk that is used to install their windows. When properly applied, caulking helps protect your entire home from moisture damage, while increasing its energy efficiency. Latex or vinyl caulks are not recommended. Most window installers use acrylic or siliconized acrylic caulking. The advantage of acrylic caulk is that it is cheaper and easier to apply. However, acrylic caulk is prone to begin shrinking and cracking after a period of time. When the cracks begin to appear, you have to caulk again or risk having water enter where it shouldn’t. Even the best acrylic caulk will begin to show signs of drying and cracking after a few years. Silicone caulk, sometimes called siliconized rubber caulk, retains a flexible, rubber-like feel for many, many years. It doesn’t dry or crack, and if properly applied in the first place, it maintains an air tight, waterproof seal for a very long time. Even though it is considerably more expensive and more difficult to work with, it is the caulking of choice for quality installers looking to provide a long lasting seal. Ask potential contractors about the type of caulking that will be used. Both acrylic and silicone caulking look the same. However, after a few years, the performance difference will become apparent, leading to repair or re-application. There is also a tendency for poor quality installers to overuse caulking to cut corners or cover up a variety of installation defects. For example, caulking a gap that is too wide will not only look bad, but it also increases the probability that the caulk will shrink and crack over time. < back to list of questions about installation