
When you replace old windows or install windows in a new home, it is important to ensure they are high-quality and operate smoothly. Window installation mistakes that happen could continue to cause problems for years to come and cost you money and time. Proper installation can help you avoid pest infestations, heat loss, and make your home more energy-efficient. Here are some common mistakes to look for during installation that could end up being a headache later on.
Making Incorrect Measurements
The biggest mistake when it comes to windows is incorrect measurements. The cuts for your windows need to be accurate to ensure a proper seal against inclement weather and pests. Incorrect cuts for your windows can cost you thousands of dollars in purchasing new windows, patching incorrect holes, and recutting into your home.
In order to prevent this mistake from happening, it is important to use the right measuring tools or hire a window professional. Steel measuring tapes or electronic measuring tools can help avoid incorrect cuts. Window installers should measure the height and width of the windows before cutting into the side of a home.
Wrong-Sized Jambs
Window jambs are the vertical sides and top of a window frame, which provide structural support and a sleeker look. Jambs are crucial in helping your window open and close properly and remain sealed after installation. If you have the wrong window jambs, the window can be affected as the house or frame ages. Knowing the width of the jabs will help them fit into the interior walls.

When the wrong-sized jambs or other window installation mistakes are made, the alignment of your window and its energy efficiency could be impacted. When fitting jamb liners, you will need the width, height, and depth to ensure the jamb sits flush with the wall. Standard jambs can range from 3 ¼ inches to 4 9/16 inches in depth, but it depends on the window size.
Jamb inserts can be used to help refurbish or replace jambs without removing the entire window. This could be a better way to save money instead of replacing the incorrect windows.
No Back Slopes
The window sill needs to be sloped to keep water and debris from getting into your home or the wall cavity. Without a slope or a pocket to catch debris, the window can become damaged, or mold can appear in small crevices. The sloped sill is often added after the rough opening has been framed in, so improperly fitted sills or skipping the sills can be difficult to mediate. Without a slope, water can get into your wall cavity, leading to rotting and mold, which are expensive to repair.
Improper Seals
Sealing the window with seal tape and nails is essential to keeping debris, pests, and inclement weather from entering your home. Improper seals may not be immediately noticeable after you install windows, but over time, you may begin to notice drafts, excessive bugs, or even mold around the windows.
Sealing tape, caulk, or additional nails can help solve your sealant problem, however, some improper installation jobs are just too hard to repair. If the window has been unsealed for years, while the house has settled, you will need to replace the entire window to avoid further issues.
Purchasing Low-Quality Windows
All window treatments are not created equal. Some window materials are not as durable as others, or the design of the frame or window itself is low-quality. Window installation can be expensive, but skimping on quality windows to save a few dollars could end up costing you more in repairs and replacement down the line. Low-quality windows with damaged wood or metal won’t last through their expected lifespan, making it more costly to purchase cheap windows and replace them in a few years.
Not Accounting For Expansion And Contractions
As outdoor temperatures change, your window materials will expand and contract. There is typically a caulk joint barrier around the exterior of your windows to allow for this process to happen without any damage to the window frame or exterior of the home. Failure to leave this gap could cause cracking in the exterior, broken windows, or tight windows that won’t open. A backer rod can also be used for larger gaps needed in extreme climates.

Window Options From Peak Windows
Peak Windows has been creating and supplying windows for many years. Homeowners and businesses in Utah can have peace of mind about their window installation when working with us. Our team works hard to avoid window installation mistakes so that you can save money in the long run. Our windows are manufactured in-house, meaning you will get better quality control and optimal results for your home. Learn more about all of our materials and window installation tips by visiting our website today!
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