Assembly was easy for me, just align and press on. (took a few minutes). You will need a utility knife (or scissors) to cut off the excess. Before the installation I wasn't really aware of how much cold air is escaping from the gap created by the aging and moving of the house, but then I noticed that my electric bill has gone down a bit even though the weather is warmer now. Definitely recommended if you have problems. Considering the ease of installation and the price compared to the savings on energy bills, it's worth the investment. Also, it was available in 2 sizes for smaller gaps.
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