Timber Panelled and Glazed Shutters, Part 1: Door shutters
2003 الطبعة

IS 1003 Part 1 permits various materials for door shutters including timber species compliant with IS 12896, where rails and stiles must be of the same species. Panels can be solid wood (single species), plywood, blockboard (IS 1659), MDF with minimum 12 mm thickness (IS 14587), veneered particle board (IS 3097), asbestos cement sheets, prelaminated particle board, wire gauze (IS 1568), and glass. Quality requirements specify permissible defects such as knots and pitch pockets with restrictions differing for first and second grades, and dead or loose knots must be plugged. Notably, no knots are allowed at hinge or lock fixing points.

The standard sizes for timber door shutters follow a modular system where one module equals 100 mm. Nominal widths and heights have a tolerance of ±5 mm, with squareness deviation not exceeding 1 mm per 500 mm length. Thickness uniformity must be within 0.8 mm variation and nominal thickness tolerance is ±1 mm. Modular sizes are listed in Table 3 of the standard, but custom sizes can be agreed upon by manufacturer and purchaser. Component dimensions and tolerances for parts like stiles, rails, and glazing bars are detailed in Table 2.

Verification of preservative treatment involves kiln seasoning according to IS 1141 prior to planing, followed by treatment of sapwood in durable species and all parts of non-durable species using preservatives compliant with IS 401, excluding water-soluble leachable types. Finished components cut for joinery also receive preservative application. The spot test method from Annex B includes cutting a cross-section of timber, applying Solution 1 to the dry surface to observe yellow coloration, then applying Solution 2 on yellow areas to detect color changes indicating boron (red) or copper (blue) presence. Complete cross-section testing ensures thorough preservative penetration.

Performance testing includes the impact (slamming) test per IS 4020 Part 8, requiring the shutter with all fittings to endure five impacts on both sides without permanent damage. The buckling test as per IS 4020 Part 9 mandates residual deflection less than or equal to 5 mm after unloading and initial deflection not exceeding 50 mm, with no deterioration. Successive impact tests (IS 4020 Part 10) involve 50 and 100 consecutive impacts with no visible damage. These tests collectively confirm mechanical strength and operational safety.

Recommended construction involves using single-piece timber for stiles and rails wherever possible. For rails wider than 150 mm, multiple pieces can be joined using continuous tongue-and-groove joints bonded with adhesive. Reinforcements include metal dowels spaced at a maximum of 200 mm intervals or wooden/bamboo pins inserted through full thickness. All jointed timber pieces should be of identical species. Rails and stiles must be of the same species, while solid wood panels may differ but must be uniform within themselves. Modular sizes from the standard's Table 3 and Fig. 6 guide panel sizing, ensuring structural integrity and aesthetic consistency.