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# What material is used for expansion joints?

## What material is used for 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.

What are the various requirements an expansion joint must meet?

There are many reasons expansion joints are required such as:

• Structure Size / Length.
• Structure Shape or Irregularities.
• Isolation of Dissimilar Building Classifications.
• Fire Separation.
• Thermal Movement.

### How do you calculate expansion joint width?

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 θ)(KMt + Ms), or W = 4(cos θ)(KMt + Ms) 2. The seal width to accommodate Mp: W = Mp ÷ 0.22 3.

What is the best expansion joint material?

Sikaflex can be used to seal horizontal expansion joints. It’s a great product because it remains permanently flexible, dries quickly, sticks to anything, is self-leveling, and highly resistant to weather conditions. You should apply Sikaflex when the temperature is between 40F-100F.

## What is the difference between expansion joint and movement joint?

In building materials, a control joint is used to control cracking while an expansion joint is designed to handle structural movement. By contrast, an expansion joint (or movement joint) is sized and formed at a width prescribed by the building design team and sealed and bridged later by an expansion joint system.

Should you fill expansion joints before epoxy?

Some people will consider filling the joints before the epoxy coating is applied. It might sound like a good idea, but if the joints are filled with a solid material and then covered with epoxy, it defeats their purpose. We do not fill the expansion joints; we paint epoxy over them to get the color continuity.