4x4 post holes to hang a sun blind for a patio

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Posted by: from Oshawa
8/11/2013 at 11:16:06 AM

Would like to hang a sun blind on the west side of my patio. The problem is, there is nothing to hang it from. Want to install two 4x4 post and attach the blind to a 2x4 between the two posts. The blind is 8' by 8'. The posts will be required to support nothing else.

My question is - is digging down 2.5 feet deep enough or should I go 3'? Can I get away with packing the holes with gravel instead of concrete?

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Torrance from RTS Contracting Inc. in Calgary
Date/Time8/11/2013 at 1:56:09 PM

I would go three feet as wind could play a factor catching the blind. Also using washed gravel is fine and especially in wetter conditions.

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Date/Time8/11/2013 at 3:01:27 PM

The deeper the better. As to gravelor concrete, I would just use gravel and tamp it well. Or, there is a new product which is a foam type product meant for posts. I've used it and find it quite good.

Ask at Home Depot or your local home improvement store.

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Date/Time8/11/2013 at 3:12:13 PM

4x4's sound like some pretty heavy duty wood to install a blind on. Consider perhaps metal or fibreglass posts that are much smaller in diameter and require a smaller diameter hole.(not as much work to dig).

Also, the reason to go down deep (4 feet), is to avoid the effects of frost heave from our long and cold winters.

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Constantine from Constantine in Toronto
Date/Time8/11/2013 at 5:46:43 PM

4 feet deep and concrete is the best way .

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Date/Time8/11/2013 at 8:50:09 PM


I have built many decks, pergola's etc.

The blind you speak of will act like a sail. And on a windy day the strain it will put on the posts will be signifigant. I would dig down 3'8" and pour concrete around the posts. I have read some other replies suggesting smaller posts. If you install steel posts that are 2"x2" you can go smaller. But I would not suggest anything alse.

Now, I have not used the product but the folks at the commercial counter at my building material supplier say the foam product is good so long as you go down a minimum of the 3'10" with your holes.

But I do live by the old saying "if your going to do it, do it right".

Good luck with your project, and enjoy the shade.

James Fram

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