Application
Window Openings in Concrete Walls
Precise window and glazing openings cut into concrete and masonry walls with straight, plumb edges ready to frame.
Window openings show up constantly in adaptive-reuse and facade-modernization work across Houston — converting a blank tilt-up warehouse wall into a storefront, adding daylight to a converted office floor, or replacing an undersized punched opening with a larger glazing unit. Unlike doorways, window openings sit up in the wall field, so the cut section has to be supported and lowered rather than simply broken out at the floor.
Crews we route work to lay out the opening from the glazing shop drawings, allowing for the frame's rough-opening tolerance, then cut with methods that keep the four edges straight and plumb so the installer isn't fighting a crooked hole. The goal is an opening that the window fits into with a consistent shim gap all the way around.
How window openings are cut
Most window openings are produced with wall sawing on a track that spans the opening, letting the operator make clean perimeter cuts and control the depth of each pass. For thick precast or double-wythe walls, wire sawing removes the panel in one controlled piece that can be rigged out. On smaller openings and for finishing corners, hand sawing squares up where the wall saw guard can't reach.
Because facade walls often carry gravity and lateral loads, a lintel or header detail from the structural engineer usually governs the top of the opening. Concrete scanning maps rebar and any post-tension or embedded conduit before the layout is finalized.
Practical considerations
- Cut sections are heavy and located above the floor — rigging, lift access, and a lay-down area are planned before the last edge is freed.
- Wet-cutting and slurry recovery keep silica exposure controlled per OSHA 1926.1153, important on occupied floors.
- Exterior openings in Houston should account for weather sealing and the building's flood/wind envelope once the wall is breached.
- Straight, plumb edges reduce shim and sealant work for the glazing crew.
Coordinate with the glazier
Cutting the opening to the glazing shop drawing's rough-opening dimension avoids costly rework when the window arrives.
Window opening FAQs
- Do window openings need a header?
- In load-bearing or shear walls, yes — the structural engineer specifies a lintel or header over the opening and any shoring during the cut. Non-structural infill walls may not, but that determination should come from the engineer of record.
- How do you keep the cut section from falling?
- The section is rigged and supported before the final edge is cut, then lowered in a controlled way. On upper floors this may involve a lift or crane and a planned lay-down area.
- Can you enlarge an existing window opening?
- Yes. Crews scan the surrounding wall, then wall-saw or wire-saw the enlargement to the new dimensions, keeping edges square for the replacement frame.
- Is scanning necessary for a window cut?
- It's strongly recommended. Scanning locates rebar, conduit, and post-tension cables so the opening avoids critical elements and the crew cuts with confidence.
Explore related resources
Ready to scope your concrete cutting project?
Send drawings, photos, or a short description and get matched with a qualified Houston crew. No obligation, no invented quotes.