Window Replacement in EIFS Synthetic Stucco — Sealant Joints, Drainage
A 1990s or 2000s house in synthetic stucco, windows fogged or leaking, and a sealant line around each one that cracked years ago.
Reply within one business day. Or call / text 763-204-2099.
Window replacement in EIFS synthetic stucco turns on the sealant joint: the wall has no overlap at the window, so the bead between the EIFS edge and the frame is what keeps water out. JMB Builders replaces EIFS windows across the Twin Cities metro, mostly as inserts with new backer rod and sealant, or full-frame where the sheathing has rotted. Priced per window, quoted from photos or at a free in-home estimate, with a reply within one business day.
- Priced per window, insert or full-frame
- New backer rod and sealant joint at every window
- Full-frame where the sheathing behind the EIFS is soft
EIFS, the foam board with a mesh base coat and an acrylic finish that looks like stucco, went on a lot of Twin Cities houses from the late 1980s into the 2000s. It is not stucco. Hard-coat stucco is cement over lath and sheds water on its face; EIFS is a foam blanket, and at every window the finish stops at a clean edge a quarter inch or so from the frame. That gap is filled with backer rod and sealant, and that bead is the waterproofing. When it cracks, water runs down behind the foam onto the sheathing.
Older EIFS, the barrier type, had no way for that water to get out, and the sheathing and framing around windows rotted without a mark on the outside. Later drainage EIFS has a drainage plane and a weep at the bottom, and it holds up far better. We check which type you have, and we probe the sheathing at the sills from inside, before anything is ordered.
Most EIFS windows are replaced as inserts: the old frame stays, the new unit sets inside it, and outside the old sealant is cut out and a new backer rod and sealant joint is made between the EIFS edge and the new frame. Cutting EIFS back for a full-frame install means a patch that never quite matches the finish, so it is done only where the frame or sheathing is rotted. Interior painting is quoted as a separate line — or leave it primed and caulked and paint it yourself.
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 pick of window style, exterior color and glass
- Whether you know if the EIFS is a barrier or drainage system, or any report from a previous inspection
- Photos of each window from outside with the sealant line in frame, one from inside, and a close-up of the bottom corner
- Your interior paint color if you want us to finish the inside trim
What JMB supplies
- In-home measure of every opening and a probe of the sheathing at the sills from inside
- The windows, ordered to size
- On inserts: old sash and stops out, new unit set and sealed inside the old frame
- Old sealant cut out and a new backer rod and sealant joint made between the EIFS edge and the new frame
- On full-frame: EIFS cut back, old frame out, rotted sheathing replaced, new window flashed to the wall with a sill pan
- EIFS patched at full-frame openings with base coat, mesh and a finish coat matched as closely as the product allows
- Interior stops, stool and casing, or jamb extensions on a drywall return
- Photos of the finished windows 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:
- Insert with a new sealant joint vs. full-frame with the EIFS cut back and patched
- Barrier EIFS, where rot is likely, vs. drainage EIFS
- Rotted sheathing and framing found at the sill
- Matching the EIFS finish texture and color at a patch
- Sealant type and joint width called for by the EIFS maker
- Number of windows in the job
Send one photo of each window from outside with the sealant line visible, one from inside, and a close-up of the bottom corner. A photo of the bottom edge of the wall, where a drainage EIFS shows a weep track, helps.
How long it takes
Inserts in EIFS with new sealant joints: four to six a day. Full-frame with the EIFS cut back, sheathing repaired and patched: one to two a day, with the finish coat curing after we leave.
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.
Situations and options
Insert with new sealant joint
The new unit sets inside the old frame. Outside, the failed sealant is cut out, new backer rod goes in and a sealant joint of the width the EIFS maker calls for is tooled between the EIFS edge and the new frame. No cutting of the EIFS.
Full-frame with EIFS patch
Where the frame or sheathing is rotted. The EIFS is cut back, the sheathing replaced, the new window flashed with a sill pan, and the EIFS rebuilt to the frame with base coat, mesh and finish, then a new sealant joint.
Barrier EIFS house
Every sill is probed before ordering, because barrier EIFS hides rot. The quote lists which openings are inserts and which need full-frame, so there are no surprises on install day.
Sealant joints on windows that are staying
On a house where only some windows are replaced, the sealant joints at the others are cut out and redone in the same visit, since that bead is what is keeping the water out.
Window Replacement in EIFS Synthetic Stucco — Sealant Joints, Drainage: questions, answered
Can you replace windows in an EIFS house without damaging the stucco?
Yes, with insert windows. The new unit sets inside the old frame and the EIFS is not cut. Outside, the old sealant between the EIFS edge and the frame is cut out and a new backer rod and sealant joint is made to the new unit. That joint is the waterproofing on an EIFS wall, so making it right is most of the job.
Why do windows in synthetic stucco houses rot?
EIFS has no overlap at the window, so the only thing stopping water is the sealant bead at the edge of the finish. When it cracks, water runs down behind the foam onto the sheathing. Older barrier EIFS has no way to drain, so the sheathing stays wet and rots without any sign on the outside. Drainage EIFS, with a drainage plane and weeps, lets that water out and holds up much better.
Is my house barrier EIFS or drainage EIFS?
Look at the bottom edge of the wall. Drainage EIFS usually shows a perforated starter track or weep holes along the bottom, and it was common after the late 1990s. Barrier EIFS ends in a plain edge with nothing behind it to drain. The age of the house is a clue but not proof. We check at the estimate and probe the sheathing at the sills from inside, which tells us more than the type does.
What kind of sealant is used at EIFS windows?
A low-modulus sealant compatible with the EIFS finish, over a backer rod, in a joint about as wide as the EIFS maker specifies, tooled to an hourglass shape so it can stretch as the wall and the window move. Painter's caulk and hardware store silicone are what failed on most of these houses. The joint is made to the finish edge, which is primed where the maker calls for it.
Can the EIFS be patched to match after a full-frame window install?
Close, not perfect. The base coat and mesh are rebuilt to the new frame and a finish coat is applied in the same texture and the closest available color. Weathered EIFS has faded, so a new patch is a shade different until it weathers. On a house with many full-frame openings, recoating the whole wall gives a uniform finish and is quoted as its own line.
Should I replace EIFS windows as inserts or full-frame?
Inserts, where the old frame and the sheathing behind it are sound, because cutting EIFS means a patch. Full-frame where the sheathing at the sill is soft, the frame is rotted or the window is changing size. We probe every sill from inside before ordering and tell you which is which, so the quote is set opening by opening.
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 10, 2026 · JMB Builders LLC, MN license BC809005 · All windows pages
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