What is the main purpose of the brace?

The brace is a compression member that prevents the door from sagging under its own weight by transferring the load from the latch side to the hinge side (Clause 5.3).

What is the maximum recommended width for a batten?

The width of a single batten should not exceed 125 mm to minimize the effects of shrinkage and expansion (Clause 4.3).

What kind of joints are specified between the vertical battens?

The battens must be joined using tongued and grooved joints, which may be V-jointed on one or both sides (Clause 5.2).

How are the ledges and braces attached?

They are typically attached to the battens using wood screws or bolts and nuts, after being housed into the battens (Clause 5.1, 5.3).

IS 6198

: 1992

ledged braced and battened timber door shutters

CurrentSpecializedSpecificationBIMArchitectural · Doors, Windows and Shutter

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This standard specifies the material, dimensional, and constructional requirements for ledged, braced, and battened timber door shutters. It provides guidelines for selecting timber, hardware, and finishes to manufacture durable and functional doors of this type, which are commonly used in utility buildings, garages, and rural construction.

ledged braced and battened timber door shutters

Quick Reference Values

Maximum width of a single batten125 mm

Typical nominal thickness of battens20 to 40 mm

Typical width of ledges and braces150 to 200 mm

Brace inclination angleApproximately 45 degrees

Permissible timber moisture content (Typical, Zone III)12 % (as per IS 287)

Minimum end lap of brace into ledge25 mm

Practical Notes

The direction of the diagonal brace is critical for preventing the door from sagging. It must run upwards from the bottom hinge side to the top latch side to act in compression.

Ensure timber is properly seasoned to the moisture content specified in IS 287 for the building's location to prevent warping and splitting after installation.

For external doors, specify tongued and grooved joints between battens for better weather resistance and select a durable timber species with appropriate protective finishes.