If so, how do I determine where I can drill, safely?
I'm thinking of mounting eye loops in the wall about 4 inches deep, to hold the one side of a shade sail, 13' along the wall and about 7' out from the wall.
The other side is mounted to a very convenient tree, which allows me to use any fastening method I like.
I have two fears;
1, I don't want to drill into wiring or piping - if there any of that in the wall.
2, I don't want moisture intrusion (alleviated by squiring silicone in the hole before inserting the eye loops and gooping silicone around it when it's seated)
Another concern is wind shear if I'm not home and the wind kicks up. I was thinking that I could use some relatively thin zip ties on the other end to hold the sail to the tree. That way if the wind is strong enough, it would shear the zip tie. Or am I on crack here?
Anyway, here's a picture of where I'd want to mount the eye loops, on each end of the red line along the wall.