Thread: Shade Sail Anchors

Originally Posted by newlandyowner

I'm putting a shade sail up at home for the car. 2mx4m sail size.

At the moment I'm looking at dyna bolting 2 x 90mm galv steel poles to the concrete which is 2 inch thick and using 2 fascia plates for the other side.

I could concrete the poles in, but it would mean having to cut the concrete then cement the poles in.

Anyone see anything wrong with using dyna bolts?

Not enough info. You haven't told us what the base plates of the 90x90 poles looks like, and how many dyna bolts of what size. How high will the poles be???

Shade sale poles have much more dynamic loading than pergola poles. Normall they have a serious footing and are cemented in at an angle.

A 50 mm thick slab is not very strong.

Originally Posted by isuzurover

A 50 mm thick slab is not very strong.

Agreed.

I'd be very reluctant to Dynabolt them to a 50mm slab unless the pole's foot plate was very large. Dunno just how large, though.

cut holes in your slab where you want the posts, dig holes about 3X the diameter of the posts, 700mm deep, and concrete the posts into these at a lean of at least 10 deg away from the load

Also make sure you have a decent gauge wall thickness on the poles as shade sales can catch a lot of breeze, resulting in some huge forces.
Like others have stated, deep heavy footings and counter angled.
Do it once and do it right!

Cheers, Mick.

also, what is the sail made of? Shade cloth will allow wind to 'balance' through it reducing the strength requirements of the support structure. Something like canvas needs a lot more strength to maintain it safely aloft. Having said all that, 2" concrete does not provide adequate strength when the leverage of posts and sail above a car is applied to it. my opinion.
Don.