Q. Specification of Wood work for Door?
1. General - Timber for door, window and ventilators frames shall be as specified. Timber shall be sawn in the direction of the grains. All member of a frame shall be of the same species of timber and shall be straight without any warp or bow. Frames shall have smooth, well-planed (wrought) surfaces the depth of the rebate for housing the shutter shall be 15 mm, and the width of the rebate shall be equal to the thickness of the shutters. A tolerance of ± 3 mm and 2 mm shall be permitted in the speci¬fied finished dimensions of timber sections in frames.
2. Joints - The frames shall have dovetail joints. The Jamb post shall be through tenoned into the mortise of the transoms to the full thickness of the transoms and the thickness of the tenon shall be not less than 2.5 cm. The tenons shall closely fit into the mortise without any wedging or filling. The contact surface of tenon and mortise before putting together shall be glued with polyvinyl acetate dispersion based adhesive and pinned with 10 mm dia hard wood dowels, or bomboo pins or star shaped metal pins. The joints shall be at right angles when checked from the inside surfaces of the respective members. The joints shall be pressed in position.
3. Fixing of frames - The frames shall be got inspected and approved by the Enginee-in-Charge before being painted, The surface of the frames abutting masonry or concrete and the portions of the frames embedded in floors shall be given a coating of coal tar. Frames shall be fixed to the abutting masonry or concrete with minimum of three holdfasts or metallic fastners as specified.
4. Measurements - Wood work wrought, framed and fixed shall be measured for finished dimension without any allowance for the wastage or for dimensions beyond specified dimension without any allowance for the wastage or for dimensions beyond specified dimensions.