木樓(lou)梯

因不(bu)能(neng)防火，應(ying)用(yong)(yong)范圍受(shou)到限制。有(you)暗(an)步(bu)式和明(ming)步(bu)式兩(liang)種。踏(ta)步(bu)鑲嵌于樓梯斜梁(又(you)稱樓梯幫(bang))凹槽內的為暗(an)步(bu)式;釘(ding)于斜梁三角木上的為明(ming)步(bu)式。木樓梯表面(mian)用(yong)(yong)涂料防腐。