Hammer Drills vs. Rotary Hammers (SDS)

What is the purpose of cleaning drilled concrete anchor holes with wire brushes and compressed air?

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 Correct IncorrectLoose concrete dust acts as ball bearings. Blowing and brushing out the hole ensures expansion anchors or epoxy adhesive can achieve full mechanical grip against solid concrete walls.

What is the purpose of cleaning drilled concrete anchor holes with wire brushes and compressed air?

• To widen the hole diameter by 2 millimeters
• To make the hole look shiny for building inspectors
• To prevent moisture from condensing inside the hole
• To remove loose pulverized dust so expansion shields or chemical adhesive anchors achieve full rated pull-out strength