目前,在农村、县镇的房屋建筑中,仍有一些前、后坡不等的小青瓦、红瓦及石棉瓦屋面,也就是单跨不等坡屋面。修建这类屋面时,墙体砌到檐高部位,常要用线绳示出山墙高度和坡度线,以便砌筑山墙。如果拉线时能先求出脊高和屋脊离前、后墙的距离那就更方便了。这 At present, in the housing construction of rural and county towns, there are still some small, blue and asbestos tile roofs with different front and rear slopes, that is, unequal slope roofs. In the construction of such roofs, the walls are built up to the height of the ravine. Lines and ropes are often used to show the gable height and slope lines in order to build gables. If you can find the height of the ridge and the distance from the front and back walls of the roof, it is more convenient. This