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Old 06-14-2017, 11:04 PM   #1
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Should I use joisting sand?


I just had a new patio fence built, but the concrete pavers inside the fence are not flush. In other words, there is a 2" gap between the pavers and the wooden fence and I do not want to deal with weeds sprouting up all along the edges. Someone recommended that I carefully fill with a 1.5" layer of polymeric joisting sand and then shower it lightly with water which will form a seal.

Is this a good idea or should I keep things simple and just fill with gravel? Any suggestions would be very welcome. Thank you in advance.
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Old 06-14-2017, 11:13 PM   #2
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Re: Should I use joisting sand?


Weeds are persistent and will grow no matter what you put in there.

I would get some landscape fabric, and use it to line the bottom of the gap, then use gravel to fill it.

And the first time you see a weed starting to sprout, pull it's nasty head off, before it gets much chance to put down deep roots.

The gravel will get a little dirt blown in from the air, and let seeds germinate on top of the fabric, but if pulled right away they stay mostly away.


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Old 06-15-2017, 07:21 AM   #3
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Re: Should I use joisting sand?


No mention of weed killers and many people like to avoid them. I have a fence in back for my puppies and I need to keep the grass and weeds down along the bottom without any toxic weed killers. I've been applying vinegar with salt and a dash of soap and although not perfect it has been 95% effective after 2 applications.

Lots of reading on using vinegar, just another option.

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Old 06-15-2017, 11:47 AM   #4
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Re: Should I use joisting sand?


I think you meant to say polymeric JOINTING sand.

Save the money and do what was described above with landscape fabric and gravel or small river rock (river pebbles?).

The polymeric sand loses its self-sticking quality in less than a year even if it is wedged between pavers. It isn't meant to fill a wide gap like you have.

The only other approach I can think of is to fill the gap with a piece of pressure treated wood cut to the proper width.
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Old 06-15-2017, 01:29 PM   #5
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Re: Should I use joisting sand?


If you do not have a good edge restraint around the pavers, the joint will open up.

The plastic is OK, but the best is a steel or aluminum band (44" deep) that is held in place periodically with good stakes on the outside.

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