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Recommend filler for driveway expansion joints?

Discussion in 'General Discussion' started by criticalbass, May 2, 2011.

  1. criticalbass

    criticalbass Sharpshooter Member

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    My driveway is about 16 years old. The builder used wooden spacers between sections and they are rotting away, allowing water to get in, and weeds to sprout. A little Roundup kills the weeds, but I want to remove the remains of the boards and fill the gaps with some sort of sealant.

    Someone told me there is a product that will adhere to the concrete, but remain flexible.

    Anybody know what I should use? CB
     
  2. VitruvianDoc

    VitruvianDoc Sharpshooter Member

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    I just use a silicon caulk. Depending on the size, some use charcoal tar like stuff.
     
  3. Shoot Summ

    Shoot Summ Sharpshooter Member

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    My concrete guy used a caulk type product to fill the expansion joints when we had our drive replaced. Look at the home centers on the concrete aisle. You will want to use a foam backer rod to fill the joint first.

    http://www.quikrete.com/ProductLines/PolySelfLevelingSealantPro.asp
     
  4. tyromeo55

    tyromeo55 Sharpshooter Member

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    This is it. Another good product is made by sekaflex. If I'm right it's the original Also if you are having trouble finding backer rod you can buy a sheet of Insulation board and cut it into strips.
     
  5. Danny Tanner

    Danny Tanner Sharpshooter Member

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    I've got a pretty big joint in my driveway, about 3/4" wide and maybe 2-3" deep that I've been wanting to seal. How close to the surface would I want to pack it with backer rod or insulation board?
     
  6. tyromeo55

    tyromeo55 Sharpshooter Member

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    Diffrent products have different specifications you'll have to read the specs on the product you can find. Usually 1/2 is good to go

    ETA:

    I looked at a tube of the sikaflex that we use and it recommends 1/4 to 1/2 inch coverage. We also buy it from Maxwell here in Tulsa if that matters
     
    Last edited: May 2, 2011
  7. Erick

    Erick Sharpshooter Member

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    Fill the gap with foam backer rod the use Sonneborn SL1 sealant. It is "self leveling" so it will fill all the voids and look great. It will run down hill fast so you should only use it on the horizontal joints. Use the matching NP-1 for the slope joints. You can get it at Maxwell's or SSI on Lincoln & 36th. You should stay away from silicone for concrete joints.
     
  8. dennishoddy

    dennishoddy Moderator Staff Member Moderator Member

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    Lowes has silicone caulk in a tube just for patching, concrete cracks, etc. It would work perfectly for what you are doing. It even has grit in it to look like you really grouted the crack. I have used it on my sidewalk, having the same problem you described. The wood rotting out. It really looks like conrete grout when your done.
     
  9. rhodesbe

    rhodesbe Sharpshooter Member

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    Sika is the HK of sealant manufacturers. It's awesome stuff, made by german pricks.
     
  10. ronny

    ronny Sharpshooter Member

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    I recommend you use an open cell foam backer rod (comes in a rope-like form). It goes in the cleaned out gap and the sealant is run on top of it.
     

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