Get Metraflex Expansion Joint

Expansion joints are created through the installation of a soft material, such as wood or foam, along the edges of concrete slabs. ... Joints should be at least 1/2-inch to 3/4-inch wide. Expansion joints should extend beyond the full depth of the concrete slab.

1. In brick or stone masonry expansion joints normally need not be necessary, except in the case of long walls exceeding 30 m in length; in such long walls the expansion joints shall be not less than 15 mm wide and shall be spaced not more than 30 m apart.

Expansion joints separate brick masonry into segments to prevent cracking caused by temperature change, moisture expansion, elastic deformation, settlement, or creep. ...

Vertical joints, for example in walls, are usually formed at a stop end in the formwork. The stop end must be easily removable, without damage to the young concrete. An alternative approach uses expanded metal mesh to form the stop end instead of the traditional timber.

When pouring and troweling your concrete slab, use a special trowel called a joint trowel, to create a narrow space between slab sections. This space will allow expansion or contraction, just as a rubber joint would. This method of creating joints is typically used for more narrow concrete surfaces such as sidewalks.

Caulking Concrete Cracks and Expansion JointsCaulking the joints and cracks is the best way to stop this from happening. Even expansion joints in your concrete driveway should be caulked. They can be the biggest culprit of water under your slabs.

The maximum joint opening is equal to the minimum installation opening plus the movement due to temperature drop and shrinkage, therefore: 0.85W = 0.60W + (cos )(KMt + Ms), or W = 4(cos )(KMt + Ms) 2. The seal width to accommodate Mp: W = Mp ÷ 0.22 3.

Expansion Joints are a bellows type device. Expansion joints are used to absorb thermal expansion. They can also be used to absorb contraction in cryogenic lines and to reduce vibration in piping systems. Materials of construction for the bellows can be stainless steel or rubber or even a composite material.

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.