檐沟靠外的合理一些~

第4个设置合理，因为天沟雨水质量靠后，弯矩小。

第一种感觉更好一些 ，受力更加合理

看建筑需要怎么样的造型吧，以业主需要来定。

具体哪种都可行，就是钢筋大小而已，不会相差太大的。

另外还要考虑施工方便了。

支持一下，希望有更多的作品交流，

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看样子是带悬挑梁的，那就随意了

挑板有点长了，加个封口梁比较好。

第四个吧

4吧