No need with an impact driver

(i had to buy a 2nd as my old impact driver died...
I am adding some nails eg where there is double headers.
Got some (most) beams temporarily in but need a temp tarp over it as I'm going to be stopping for a week. What's the best way to tie it down? Was considering it I could just use clamps with a bit of roofing batten above it
@dlockers any thoughts?
My circular saw also died today so not very happy with my only 7 year old makita gear!
These lengths are 3.9m and dammed heavy when doubled up rough Sawn 5x2!