"Capt. Geoffry Thorpe" The Sea Hawk at wow way d0t com wrote

Don't understimate the power of the wind and the strength of cheap tarps.
I
build a stucture somewhat larger than that with a tarp roof and
pollyethylene on the walls. I figgured that the plastic would blow off if
the wind got too strong.

Wrong...

Agreed. Use substantial footings (read deep) with bolts for the posts, or
use mobile home screw in anchors, and loop straps all of the way over the
top.
--
Jim in NC