屋顶板条一直没钉牢。The roof was never securely battened down.屋顶板常浸涂木焦油.Shingles are often dipped in creosote.一些屋顶板不见了。The roofs had shingles missing....

“顶梁”的英语可以翻译为：ack timber，carrying bar，headpiece，set collar ...