Log Home Window Replacement — Bucks, Settling Space and Flashing
Your log home's windows are drafty, fogged or rotted at the sill, and the opening has to keep moving as the logs settle.
Reply within one business day. Or call / text 763-204-2099.
Log home window replacement keeps the logs free to settle: JMB Builders checks the buck in each opening, fastens the new window to the buck and never to the logs, keeps a settling space above the head filled with compressible insulation, and flashes and trims it so the logs can slide past. Twin Cities metro to St. Cloud. Priced per window; send photos for a reply within one business day, or book a free in-home estimate.
- Priced per window
- Window fastened to the buck, never the logs
- Settling space kept above every head
Logs shrink as they dry, and a log wall gets shorter over the years. A window cannot shrink with it. That is why a log home window sits in a buck — a wood frame in the opening that rides in a slot or spline in the log ends — with a gap above the head. When the gap is missing or got packed with hard foam, the logs land on the window, the sash binds and the glass cracks.
Replacement starts with the buck. We check it for rot, square and whether it still slides in the logs. A sound buck is reused; a bad one is rebuilt to the same idea. The new window is fastened to the buck only. The space above the head is kept, filled with compressible insulation, and covered with trim fastened on one side so the logs can move behind it.
Outside, the head gets flashing and a drip cap that lets the logs slide down past it, and the sill sheds water away from the log below. Rot in the log itself is a separate repair, priced on its own line or done by a log repair specialist; we tell you what we find at the measure.
Get a written quote for this job
Three photos and a sentence is enough: a reply within one business day, or ask for a free in-home estimate. Or text the photos to 763-204-2099.
What you supply
- Your choice of window style, frame color and glass
- Stain color for new interior trim, or plan to finish it yourself
- Access to the cabin or home on install days
What JMB supplies
- Measure of each opening and a check of the buck and settling space
- Windows ordered through ABC Supply to fit the buck
- Window fastened to the buck, never through the logs
- Settling space kept and filled with compressible insulation
- Head flashing and drip cap that let the logs slide
- Interior and exterior trim fastened so the logs can move
- Haul-away and photos in your job folder
How it is priced: per window
Quoted in writing from your photos, with a reply within one business day. What moves the number:
- Number, size and style of windows
- Whether each buck is reused or rebuilt
- Rot at the sill or log ends below the opening
- Size of the settling space and how it was filled
- Interior trim: reused, new pine or cedar, stained or not
- Distance and access to the site
Send a photo of each window inside and out, and a close-up of the top of the trim, where the settling space is. Tell us roughly when the house was built. Painting or staining is quoted as a separate line, or you finish it yourself.
How long it takes
Two to four windows a day where the bucks are sound. Rebuilt bucks take longer; the schedule is written on the quote. Lead time depends on the brand.
How your project works
- 1
Send photos, get a written quote
Send three photos of the space and a sentence about what you want. You get a clear, itemized reply within one business day. Prefer a look in person? A free in-home estimate is always an option.
- 2
Pick materials, or bring your own
We help you choose profiles and materials that fit the house and the budget, or match your existing millwork exactly — or you buy the door or trim yourself and we install it. Everything is confirmed before the crew is scheduled.
- 3
Clean, precise installation
The crew shows up on time, protects floors and furniture, and installs with tight joints and consistent reveals. Photos of the finished work go in your job folder.
- 4
Walkthrough and invoice
We walk the finished work with you. If anything is not right, we fix it before we call the job done. Then one invoice, paid by check or direct deposit — no card fees, no payment links.
Log Home Window Replacement — Bucks, Settling Space and Flashing: questions, answered
Why do windows in a log home need a settling space?
Logs shrink as they dry, so the wall gets shorter over time. Without a gap above the window, the logs come down onto the frame, the sash binds and the glass can crack. The space is kept on replacement and filled with insulation that compresses as the logs settle.
What is a window buck in a log house?
It is the wood frame in the window opening that the window is fastened to. It rides in a slot or spline cut in the log ends, so the logs can slide down past it while the opening stays square. On replacement the buck is checked and reused or rebuilt.
Can a regular replacement window go in a log home?
Yes, as long as it is sized to the buck and fastened only to the buck. The window itself is the same kind used in a framed house. What makes it a log home job is the settling space, the flashing and the trim that let the logs move.
Should the trim on a log home window be nailed to the logs?
Only on one side of the settling space. Trim nailed to both the logs and the buck gets torn or pulls the window as the logs come down. We fasten trim so the logs can slide behind it.
What if the log under my window is rotted?
Water that got past a failed sill often rots the log below. Small rot at the buck is repaired with the window. Rot in the log itself is a separate repair, priced on its own line or done by a log repair specialist, and we show you what we found at the measure.
Do you replace windows in log homes outside the Twin Cities?
We work from the Twin Cities metro north to St. Cloud. Send the address with your photos and we tell you right away if it is in our area.
Recent JMB work, from our job log
59 installs recorded across 30 Twin Cities communities since Dec 2025. Window and door installs for homeowners and the builders we work with. Counts come straight from our job log; no customer names.
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Read morePage reviewed October 9, 2026 · JMB Builders LLC, MN license BC809005 · All windows pages
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