1.What is a purlin?
1.什么是檩条？
2.What\'s the minimum clearance in an attic crawl space?
2.阁楼爬行空间的最小净空是多少？
3.How many nails are used on a standard three-tab shingle?
3.标准三片瓦片使用多少个钉子？
4.How far from a valley\'s centerline must flashing extend?
4.防水板必须距离屋檐中心线多远？
5.Where is the best place to check for a roof leak?
5.检查屋顶漏水的最佳位置是哪里？
6.When can you add an extra layer to existing asphalt shingles?
6.什么时候可以在现有的沥青瓦上加一层？
7.How long wait before caulking new tiles?
7.新瓷砖填缝前需等待多久？
8.How to clear roots on a construction site?
8.如何清理建筑工地上的树根？
9.What\'s the difference between a hip jack rafter and a common rafter?
9.屋脊椽与普通椽的区别是什么？
10.On a 4-ply roof how much should be exposed to weather?
10. 在 4 层屋面中，暴露于天气的部分应为多少？
