Corners and terminations below grade: inside corners, outside corners and the top edge
The film studio’s basement wall turns around several recesses before meeting an above-grade wall finish. One crew assumes every top edge needs the same fixing bar. The landscape grade has changed, but the membrane termination drawing still shows the old section.
Give corners and terminations their own detail map instead of checking only the flat membrane field. Confirm the actual shape, approved components and connection to adjoining work. The sheet-system guide below distinguishes inside corners, outside corners and top terminations; it presents a termination bar as an option within that system. A bar, fixed height or corner treatment should not become a universal instruction for unrelated assemblies.
Map the edges that the flat-wall checklist misses
- Number the detail types. Mark inside corners, outside corners, recesses and top edges on the elevation. Separate typical configurations from exceptions. Give photographs and observations the same identifiers so the review can follow every change in the wall.
- Check final-grade coordination. Gather the current envelope and landscape sections for the termination. Ask the responsible designer to confirm the interface when grades or finishes differ. Do not decide its elevation from a remembered dimension on another project.
- Identify the approved assembly. Confirm corner accessories, substrate preparation, overlaps, edge treatment and any specified mechanical fixing from the actual system documents. Have unresolved material combinations or fixing locations reviewed before the crew orders a convenient substitute.
- Arrange a representative detail check. Build the required mock-up or first detail using the approved arrangement and actual profile. Record the review’s scope and any corrections. A flat-wall sample cannot automatically establish the suitability of a three-dimensional corner.
- Check adjoining-work responsibilities. Name who supplies and installs the relevant flashing, finish or other transition components. Agree which parts must be available before the membrane edge is treated as complete. Keep a temporary edge distinct from the finished termination.
- Close the exceptions before concealment. Walk the numbered locations with the current detail references. Retain condition, correction and acceptance evidence while visible. Hand the next trade the released boundaries and protection requirements, with changed-grade locations still identified if unresolved.
Common mistakes
- Specifying one termination height without checking current grade and envelope details.
- Assuming every membrane requires the same bar and sealant.
- Calling a temporary edge the completed wall interface.
Action list
Make every corner and edge traceable
- Number actual configurations.
- Confirm current grade and envelope references.
- Match approved components and fixing requirements.
- Record representative checks and exceptions.
- Assign adjoining work and covering releases.
Check your understanding
The typical corner is accepted, but a recessed wall has a different profile. What should the foreman record?
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