木樓梯

因不(bu)能防火，應用(yong)(yong)范圍受到限(xian)制(zhi)。有暗步(bu)(bu)式(shi)和明(ming)步(bu)(bu)式(shi)兩(liang)種。踏(ta)步(bu)(bu)鑲嵌于樓(lou)梯斜梁(又稱樓(lou)梯幫)凹槽內的為暗步(bu)(bu)式(shi);釘于斜梁三角木(mu)上的為明(ming)步(bu)(bu)式(shi)。木(mu)樓(lou)梯表面用(yong)(yong)涂料(liao)防腐(fu)。