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Monday, October 12, 2026
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General construction glossary

Grout

Grout is a fluid cementitious or similar mix that fills gaps and voids, for example in masonry cells, under base plates or between tiles.

Grout is a fluid cementitious or similar mix that fills gaps and voids, for example in masonry cells, under base plates or between tiles.

Definition

Grout is a flowable mixture that is poured or pumped into a space so that it hardens and fills it completely. Different products are made for masonry cores, base plates and tile joints.

A plain example

Illustrative example: after a steel column is set on a concrete footing, a gap remains under its base plate. Non-shrink grout is placed in that gap so the plate bears evenly on the footing.

Why it matters

Voids under a plate or in a wall can reduce load transfer and let moisture in, so the right product and placement method matter.

Common confusion

Grout is not the same as mortar. Mortar bonds and bedding units together. Grout is more fluid and fills spaces. Tile grout is a separate product again.

On a project

Use the product named in the specification, follow the manufacturer's mixing and curing instructions, and keep records of batches where the engineer requires it.

Quick answers

  • Is grout the same as concrete? No. Grout is usually a finer, more fluid mix without large aggregate.
  • What is non-shrink grout? A grout designed to avoid shrinking as it sets, used where full bearing is needed.
  • Can I use tile grout under a base plate? No. Use the product the specification calls for.

Related terms

Always check the project drawings and specification, and confirm requirements with the engineer of record and the local authority.

Questions people ask

Is grout the same as concrete?

No. Grout is usually a finer, more fluid mix without large aggregate.

What is non-shrink grout?

A grout designed to avoid shrinking as it sets, used where full bearing is needed.

Can I use tile grout under a base plate?

No. Use the product the specification calls for.

Sources and further reading

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