木樓梯(ti)

因不能(neng)防火，應(ying)用(yong)(yong)范圍受到限制(zhi)。有暗(an)步(bu)式(shi)(shi)和明步(bu)式(shi)(shi)兩種(zhong)。踏步(bu)鑲嵌于樓(lou)梯斜(xie)梁(liang)(又稱(cheng)樓(lou)梯幫)凹槽(cao)內的為暗(an)步(bu)式(shi)(shi);釘于斜(xie)梁(liang)三(san)角(jiao)木(mu)上的為明步(bu)式(shi)(shi)。木(mu)樓(lou)梯表面用(yong)(yong)涂料(liao)防腐。