There’s no shortage of Weather stripping options at hardware stores and home improvement centers. As is often the case, the cheaper and easier the product is to install, the less effective and durable it probably is over time.
Adhesive-backed foam tape is inexpensive — costing less than a buck a foot — and peel-and-stick types are easy as pie to install. It works best where the bottom of a window sash closes against a sill, or a door closes against a doorframe. It’s the compression that produces the seal. Don’t expect this product to survive longer than 3 to 5 years.
V-shaped Weather stripping, sometimes called tension-seal weather stripping, is the best option for the side channels of a double-hung window or a tight-fitting door. This product springs open to close gaps and plug leaky windows and doors.
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