## What is a seismic joint cover?

Expansion Joint Cover is a cover or a covering system that protects the structural gap designed to accommodate the movement of the building in a controlled to prevent damages to the building finishes.

### What is an EJ cover?

An Expansion Joint Cover, or EJC for short, provides a covered transition across the Expansion Joint opening, remaining unaffected by the relative movement of the two surfaces either side of the joint.

What is a vertical expansion joint?

Expansion joints are cuts in concrete slabs, or the joints between walls and concrete slabs, that go completely through the slab to the base material. The purpose of an expansion joint is to allow the concrete slab to expand and contract with temperatures changes, without cracking the slab.

What is a joint cover?

Joint cover for you and someone you live with, as drivers or passengers in any vehicle. You can add someone else to your personal cover as long as you both live at the same address. We’ll rescue either of you if any car you’re in breaks down.

## Why are seismic gaps important?

The seismic gap hypothesis states that earthquake hazard increases with time since the last large earthquake on certain faults or plate boundaries. One of the earliest and clearest applications of the seismic gap theory to earthquake forecasting was by McCann et al.

### Do I need an expansion joint in concrete slab?

Expansion joints are virtually never needed with interior slabs, because the concrete doesn’t expand that much—it never gets that hot. Expansion joints in concrete pavement are also seldom needed, since the contraction joints open enough (from drying shrinkage) to account for temperature expansion.

How are seismic gaps recognized?

Seismic gaps – A seismic gap is a zone along a tectonically active area where no earthquakes have occurred recently, but it is known that elastic strain is building in the rocks. If a seismic gap can be identified, then it might be an area expected to have a large earthquake in the near future.

How does a seismic gap form?

The seismic gap hypothesis implies that earthquake hazard is small immediately following a large earthquake and increases with time thereafter on certain fault or plate boundaries [Sykes and Nishenko, 1984, p.

## What happens if you don’t put expansion joints in concrete?

Concrete expansion joints give the slabs just enough room to move which helps prevent cracks & buckling. Without these joints, even a little movement creates pressure and stress on the concrete. Eventually weak spots can crack or buckle.