Replies

1. 
   maverick | Dec 08, 2004 03:24pm | #1

   Polyuerathane calk. You may want to use a backer rod in the wider/deeper gaps so you dont need to fill them completely.

   Of course Home depot calls it by their own name, "caulk saver"

2. 
   IronHelix | Dec 08, 2004 03:33pm | #2

   First fill mist of the depth of the crack with backer rod (a long rod shaped closed cell foam) then fill the last 3/8-1/2" of depth with a  flexible caulk to allow for the expansion and contraction of the slab and blocks.

   There are several choices for caulk.

   SL1 which is usually available in quarts and is a concrete gray color and is self leveling (flowing semi liquid).  Down side is that it can be very messy and is solvent based. May not be very interior friendly.  Usually used on drives and walks.

   Dap Sidewinder...a tough polyurethane caulk available in 11 oz tubes. Paint thinner cleanup, quite flexible, good adhesive qualities, several colors & clear. Still may not be interior finish friendly.

   Big Stretch by Sashco is a water based caulk that sets as an very elastic seal with good adhesiveness.  11 oz tubes and several colors. Interior friendly as while unset it smothes and cleans with a wet sponge.

   Maybe some other breaktimer's will add their experiences and option.

   .............Iron Helix

    

3. 
   Catskinner | Dec 08, 2004 05:42pm | #3

   Any good-quality urethane will do, but I stay away from the big-box brands. I've had great results with Sikaflex. Check with a store that sells to the concrete trade in your area.

   The backer rod is essential.

   It will save you a lot of money on caulk, but that is a side effect. Caulk only works the way it's supposed to when it adheres to two surfaces. When it adheres to three surfaces in a large gap, it will likely fail.

   DRC

   Substitute d*mn every time you're inclined to write very; your editor will
   delete it and the writing will be just as it should be. -Mark Twain, author
   and humorist (1835-1910)