木樓梯

因不能(neng)防(fang)火，應用(yong)范圍受到(dao)限(xian)制。有(you)暗步式(shi)(shi)(shi)和明(ming)步式(shi)(shi)(shi)兩種。踏步鑲(xiang)嵌于(yu)樓(lou)梯斜梁(又(you)稱樓(lou)梯幫)凹槽內的為(wei)暗步式(shi)(shi)(shi);釘于(yu)斜梁三角木上的為(wei)明(ming)步式(shi)(shi)(shi)。木樓(lou)梯表面用(yong)涂料防(fang)腐。