Interlocking metal channel weather strip is the only weatherstripping described by the Department of Energy as “exceptional”. Metal is described as such because these products are superior to other weatherstripping materials in so many of their features:
Metal interlocking products withstand the friction of window and door parts moving and sliding against each other.
Operating windows and doors is all about moving parts. Window sashes move up and down against each other as they are opened and closed. Doors swing open and closed against the frame and threshold with each passerby. This repetitive rubbing wears out many products. Especially cheaper weatherstripping products like adhesive foam and rubber.
Metal almost completely seals out air loss – cold drafts in winter, letting cool air escape in summer.
The interlocking design means the parts interconnect with one another, creating a superior seal. It’s next to impossible for air to make its way all around, down, and over the path of the interlocking parts. This superior seal will keep the cold air out in wintertime, and trap cooled air inside during hot months.
Because it is metal and installed with metal fasteners, they are not susceptible to changes in temperatures that cause other materials to shrink or expand, or adhesives to fail.
Many cheaper weatherstripping products depend on adhesives to stay in place. Since, by their very nature, they are exposed to the harshest of elements. Adhesives simply do not hold up through freezing cold temperatures and extreme heat for very long before the adhesive fails and the product moves. And get them wet, well, forget it! Once the adhesive bond has failed, the weatherstripping quickly loses its effectiveness.
Tremendously strong and durable to hold up to the wear and tear associated with window and door usage.
For example, when applied to a door bottom or threshold, weatherstripping could drag on carpet or erode as a result of foot traffic. Weatherstripping in a window sash must accommodate the sliding of panes -- up and down, sideways, or out.
Metal interlocking weather strip doesn’t impede the operation of a window or door.
The weatherstripping you choose needs to seal well when the window or door is closed BUT it also must allow the elements to move freely. Who wants a weatherstripped window that no longer opens without a fight, or has to be forced closed because product material is filling in the gaps too much.
Metal weatherstripping provides a much better look to older homes where vinyl might seem out of place.
One of the appealing features of older homes is the hand crafted architecture and elements. Slap a piece of foam weather strip on, or tack a section of white vinyl seal along an original wood window and it just doesn’t look right. Metal has the look of quality and authentic materials that adds a nicer touch to an antique building.
It's an excellent investment because it will last many decades as compared to cheaper options.
Yes, metal interlocking weatherstrip is more expensive than garden-variety hardware store choices. BUT you need to take durability into account when comparing costs. There’s really no comparison to how resilient and durable metal is when matched against foam, rubber and plastic versions.
Considering how expensive energy costs are for a household, eliminating loss of heat and cooling will pay for metal weatherstripping products in no time!
Utility costs are higher than ever, and on the rise. Your heating or cooling could literally be going out the window. Since as much as 25% of heat loss is out windows and doors, taking the best measures possible to prevent that loss is well worth the expense!