Door and window frames — name of the small projections at the head and sill In timber door/window frames, the short projections that extend beyond the masonry opening at the head and sill to key the frame into the wall during construction are called:

Introduction / Context:
Timber frames often include details that help secure them within masonry openings. Knowing these parts improves coordination between carpentry and masonry trades and ensures durable fixing.

Given Data / Assumptions:

• Conventional timber door/window frames.
• Masonry wall openings prepared to receive frames.
• Traditional methods without proprietary anchors.

Concept / Approach:

Horns are the short extensions at the top and bottom ends of the frame members, left long to be built into the masonry or trimmed after fixing. A transom is a horizontal member dividing a window vertically; stops are small rebates that the shutter closes against; chocks are temporary wedges used during fixing and not a standard frame component name.

Step-by-Step Solution:

Verification / Alternative check:

Carpentry details in building manuals specify horns for fixing frames in masonry, often later trimmed flush after construction.

Why Other Options Are Wrong:

• Transoms subdivide fenestration; not projections.
• Stops are rebates for shutter closure.
• Chocks are temporary aids, not frame features.

Common Pitfalls:

• Removing horns prematurely before masonry has set, weakening the fix.

Final Answer:

Horns.