木(mu)樓(lou)梯

因不能(neng)防火，應用(yong)范圍受到限制。有(you)暗步(bu)式(shi)(shi)和(he)明步(bu)式(shi)(shi)兩種。踏(ta)步(bu)鑲嵌(qian)于樓(lou)梯(ti)(ti)斜梁(又稱(cheng)樓(lou)梯(ti)(ti)幫)凹槽內的(de)為(wei)(wei)暗步(bu)式(shi)(shi);釘于斜梁三(san)角木(mu)上的(de)為(wei)(wei)明步(bu)式(shi)(shi)。木(mu)樓(lou)梯(ti)(ti)表面用(yong)涂料防腐。