panabiker wrote in news:14db0aa5-35f2-4fff-9832-
:

I am thinking of getting a 10'x10' canopy that is made of fabric top
and a frame with 4 metal legs, and set it up on my back patio. The
patio was build with 6"x9" paver bricks. My question is, how should I
anchor the legs onto the patio. Each leg has 4 screw holes. If I
simply drive some screws into the bricks, would they keep the canopy
from being blown away (under reasonable summer weather)? These bricks
are not bind to each other but tightly put together with sand filling
the gaps. Would screws even stay in the bricks, or will they crack the
bricks?

Screws would crack the bricks and even if you drilled extra carefully and
used anchors the bricks are not heavy enough to resist much vertical
force.

You need some sort of heavy anchor type base. You could simply pour a
concrete footing of about 400 lb weight - concrete weights about 125 to
150 pounds per cubic foot. It should be 8 inches thick to hold drilled
anchors. Make a box about 24" x 24" by 8" thick. Use about 2 to 4
reinforcing bars each way evenly spaced - total of 6 to 8 bars. Locate
the bars about the midpoint of the pad thickness. Get pre-mix concrete at
home supply store and mix exactly as per instructions - water content is
important to get right.

Dig down a bit so top of block is an inch above the patio bricks to keep
top dry and reduce chance of bolts rusting. Better yet to use all
stainless steel anchors and bolts. You don't need a sand base layer. Pour
the bottom half and then lay bars down and pour top half. If you have to
stop and mix more concrete keep delay to less than 1/2 hour so layers
adhere to each other propoerly.

Get some Hilti concrete anchors and install them as per the instructions.
You would need to rent or borrow an impact drill. The anchors use bolts
so you install the anchors and then bolt the legs down.