How do you fill gaps in concrete?

Asked By: Gaylord Falchi | Last Updated: 13th March, 2020
Category: business and finance construction industry
4.2/5 (56 Views . 21 Votes)
Fill the trenches on either side of the driveway with small, rounded pea gravel (the size of marbles or peas). Do the same for the gaps between the concrete slabs, but stop filling the gaps about 2 inches from the top of the slabs.

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Correspondingly, what do you use to fill gaps in concrete?

Fill and smooth the joint Fill the crack with urethane caulk, similar to what you would use for driveway caulk. It works perfectly as a concrete expansion joint sealant. Snip the opening of the tube at a 30-degree angle, making the opening the same size as your gap.

Subsequently, question is, how do I fill the gaps in my concrete driveway? The best way to repair your expansion gap is to use purpose-designed foam backer rods and self-leveling caulk. Both materials are available in most home improvement stores. Cut your foam backer rods to the proper length for your expansion gap and press them into the gap.

Hereof, should I fill concrete expansion joints?

Just remember that expansion joints should always be sealed and filled with a flexible joint sealer and never be epoxied or coated over. Contraction joints can be filled in the same manner after a coating or sealer is applied.

Should concrete control joints be caulked?

Control joints or saw cuts should be addressed the same as above. The control joint can be filled with backer rod or even sand. Filling the saw cut is mandatory as control joints are 1/4 the thickness of the concrete. On a 4″ slab, that is a 1″ deep saw cut and nobody want to use that much caulking.

13 Related Question Answers Found

How do you fill large expansion joints in concrete?

  1. Remove any dirt, leaves and other debris from the large joint with a hand brush.
  2. Cut foam backer rod to fit the length of the joint with a utility knife.
  3. Attach a tube of self-leveling urethane sealer to a caulk gun.
  4. Apply an even coat of concrete sealer over the driveway and expansion joints with a roller brush.

How big can a concrete slab be without expansion joints?

Usually, expansion joints should be no farther apart than 2 to 3 times (in feet) the total width of the concrete (in inches). So for a 4 inch thick concrete slab, expansion joints should be no more than 8 to 12 feet apart.

What is the best concrete caulk?

Silicone represents another popular material to use as a concrete caulk. It does not degrade as fast as the organic urethane caulks, and it remains flexible yet sturdy in its hold. One of the best uses for silicone caulk involves filling the gaps between concrete and other materials, such as brick, wood or metal.

What material is used for expansion joints in concrete?

Minimize Concrete Cracking and Damage with Expansion Joints. ASPHALT EXPANSION JOINT is composed of a blend of asphalts, vegetable fibers, and mineral fillers formed under heat and pressure between two asphalt-saturated liners. It is waterproof, permanent, flexible, and self-sealing.

How do I fill the gap between two buildings?


The gap is sealed from outside on its perimeter. One method is to seal it with profiled metal sheets that allow the movement of one building relative to the other. If the gap is filled with whatever tough and rigid materials, during an earthquake, one building could induce unwanted efforts and damage the other one.