木樓梯

因不能(neng)防(fang)火，應用(yong)范圍(wei)受到限制。有暗(an)步(bu)(bu)(bu)式(shi)和明(ming)步(bu)(bu)(bu)式(shi)兩種(zhong)。踏步(bu)(bu)(bu)鑲嵌于(yu)樓(lou)(lou)(lou)梯斜梁(又(you)稱樓(lou)(lou)(lou)梯幫)凹槽內(nei)的為暗(an)步(bu)(bu)(bu)式(shi);釘于(yu)斜梁三(san)角木(mu)上的為明(ming)步(bu)(bu)(bu)式(shi)。木(mu)樓(lou)(lou)(lou)梯表面(mian)用(yong)涂(tu)料(liao)防(fang)腐。