There was a large building in front of me with an old fashioned thatched roof.

我前面是一座大房子，它的老式屋顶是用茅草盖的。

youdao

Nothing is tied onto the roof, as you would in a modern thatched building but the wheat straw that we've used is knotted and then tucked into a woven framework.

BBC: Old Sarum project sees Neolithic huts built