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Old 06-26-2011, 06:40 PM   #1
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What to use to fill in concrete joints to reduce weeds?


In my driveway and my backyard patio I have the usual concrete joints. But I'm having a heck of a time keeping them weed free. I haven't tried weed spray yet, seems like a pain to have to do it so often.

What would be the proper way to fill in the joints to keep the weeds out? I've seen some liquid filler in the store, and I've seen some type of felt material wedged in a joint following the garage door base line before. I understand that whatever it is it needs to be flexible so the slabs can expand and contract.

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Old 06-26-2011, 07:40 PM   #2
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What to use to fill in concrete joints to reduce weeds?


There is a concrete caulk just for that purpose---very stretchy.

Perhaps a concrete person will give you a favored brand---Mike---
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Old 06-26-2011, 10:09 PM   #3
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What to use to fill in concrete joints to reduce weeds?


Sika makes a self leveling product in tan and gray. If the spaces are deep, measure the width and buy backer rod to install in there. It should go down about 1/2" or so. Backer rod comes in widths of 3/8" to 3/4", maybe more. The concrete needs to be clean and dry or the material won't adhere to the sides.
It comes in 2 caulking tube sizes. If you have a lot of work, get the large tubes and a large caulking gun.
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Old 06-26-2011, 10:59 PM   #4
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What to use to fill in concrete joints to reduce weeds?


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Sika makes a self leveling product in tan and gray. If the spaces are deep, measure the width and buy backer rod to install in there. It should go down about 1/2" or so. Backer rod comes in widths of 3/8" to 3/4", maybe more. The concrete needs to be clean and dry or the material won't adhere to the sides.
It comes in 2 caulking tube sizes. If you have a lot of work, get the large tubes and a large caulking gun.
The picture above is the side yard, it's a sort of wide boat parking area that's kind of V angled. Water can collect around that area. How would using a solid sealant affect an area like this? Would using a more porous material be better for drainage? I can see using a liquid sealant for my driveway since it's sloped and water just runs down to the street.

What are those "felt-like" strips that can be tapped into joints? I don't know the construction lingo, so it's difficult to find. All I can find is some Deck-o-foam, but that seems to be just like a backer rod and most likely requires other material to be applied on top.
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Old 06-26-2011, 11:13 PM   #5
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What to use to fill in concrete joints to reduce weeds?


Roundup.
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Old 06-26-2011, 11:37 PM   #6
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Roundup.
Yea, I know I could use a spray. But you have to be on top of it. You miss an application then ya got weeds that will have to be pulled. Even dead weeds are undesired.
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Old 06-26-2011, 11:49 PM   #7
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What to use to fill in concrete joints to reduce weeds?


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You miss an application then ya got weeds that will have to be pulled.
Why? Next little beggar that pops up...spray him too.

Use vegetation killer instead of Roundup and that will end your problems for a long time.

Anything you do can still harbor enough soil to propagate a weed.
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Old 06-27-2011, 12:36 AM   #8
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What to use to fill in concrete joints to reduce weeds?


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Anything you do can still harbor enough soil to propagate a weed.
Which is why I'd like to just fill the cracks. Some type of porous material would be nice. Like I mentioned before, some of the "felt" like material, whatever it's called. Don't know the name, but I've seen it stuffed in a transition from the garage cement to the driveway cement.
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Old 06-27-2011, 01:00 AM   #9
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What to use to fill in concrete joints to reduce weeds?


a mixture of diesel and oil sprayed in there every so often would probably keep anything from growing, ever


but anyway, get a pressure washer and spray the cracks out really good, you can't fill the cracks if they are already full. Get them emptied out, then get some gray concrete caulk, depending on how wide it might take a lot of it
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Old 06-27-2011, 01:28 AM   #10
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What to use to fill in concrete joints to reduce weeds?


In my experience, repeated applications of Round-Up over time will have longer and longer lasting results - making the occational missed application not a big deal. Anything you do to fill the cracks will have weeds reoccur - mother nature is very persistant.
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Old 06-27-2011, 08:15 AM   #11
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What to use to fill in concrete joints to reduce weeds?


keeping the weeks out is good but you also want to prohibit ' incompressibles ' - those little stones that will spall conc,,, joints narrow as a result of hot temps which causes slabs to increase in size,,, this is why dot's seal cracks & joints OR contract w/those who do this work for a living ( i was 1 of 'em ! for yrs ),,, for your use, 100% silicone will work fine as will sika - both are avail at your local apron/vest store,,, be sure the sidewalls are extremely clean prior to applying sealant - the tip about backrod is a good 1 & shouldn't be ignored,,, few sealants are any good over 3/8" thick as they will generally cause loss of adhesion,,, tooling is also good,,, the best proportion is 2wide : 1 thick

good luck !
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Old 06-27-2011, 09:23 AM   #12
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What to use to fill in concrete joints to reduce weeds?


There's an extended control round-up that they say works for four months. Also you can sprinkle a pre-emergent weed killer in your joints in the early spring so stop things from growing in them.
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Old 06-27-2011, 10:37 AM   #13
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What to use to fill in concrete joints to reduce weeds?


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There's an extended control round-up that they say works for four months. Also you can sprinkle a pre-emergent weed killer in your joints in the early spring so stop things from growing in them.

this is how id go about it, with the joints filled, chemicals wont get in there very good when it is time to spray. Also, it may take a TON of sealant. If chemicals were just sprayed in there, nothing is going to want to grow In the future either. Another thought i had, Maybe clean out the cracks really good and fill with sand. Weeds would still be able to grow eventually, but it would make the growing conditions much poorer, especially when sprayed with chemicals
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Old 06-27-2011, 05:01 PM   #14
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What to use to fill in concrete joints to reduce weeds?


Diesel fuel (or other petroleum products) = not a good idea.
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