Wooden stair o As they are light in weight, mostly used for residential building. o The main objection to this stair is that it is easily attacked by fire and thus, in fire, the occupants of upper floor can’t escape. o If it is made from good timber like Teak, and thickness is about 45mm, it becomes sufficiently fire proof and allows enough time for occupants on upper floor to escape. Factors to be considered here are,  The string supporting ends of wooden steps may be a cut string/closed string.  Scotia blocks may be provided to give additional finish to wooden steps.  Small triangular wooden blocks called glue blocks may be provided at inner angle formed between a trade and riser, to provide additional strength.  A metal strip may be provided on nosing of wooden step to increase its resistance against wear and tear.  The landing may be formed by providing wooden beams of suitable sizes.  Sometimes risers are omitted. trades are housed in strings and soffit is covered with wooden battens/metal sheets.  The timber used should be free from fungal decay, insect attack, or any defect. Edges may be finished smooth and excess light timber should not be used. - Study24x7
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soyab khan
16 Apr 2019 10:21 AM study24x7 study24x7

Wooden stair o As they are light in weight, mostly used for residential building. o The main objection to this stair is that it is easily attacked by fire and thus, in fire, the occupants of upper floor can’t escape. o If it is made from good timber like Teak, and thickness is ...

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