I've seen contractors clean out holes with water and then blow them out with air. Is this acceptable, and does it impact installed strength?
Rick,
Hilti injectable adhesive anchors require compressed air that is delivered at a minimum of 90 psi and 3.5 cfm as indicated in the Instruction for Use. Furthermore, the published load values in our technical documents are based on the 2x2x2 (blow-brush-blow, 2 times) cleaning procedure. The Hilti Safe Set which incorporates our hollow drill bit and vacuum system may be an alternative to the 2x2x2 procedure and will be included in the applicable product technical documents and Instruction for Use. For more information regarding the effects of improper hole cleaning on the capacity of the anchor, please refer to this video.
Paris
Hi Richard,
The hole cleaning method will depend on the type of anchor and manufacturer. In order to ensure you are following the proper hole cleaning and installation methods, please refer to the Manufacturer Printed Installation Instructions for the specific product you are installing.
Regards,
Paris