fitting a Modular Speed Bump and need to know what size drill bit im going to need to secure theses bolts into the tarmac
These bolts require a 16mm size drill hole. However, they work best in concrete, and are liable to pull out of tarmac.
Speed bumps being fitted on to bitumen / tarmac, would normally be fixed by something like the JSP Asphalt Speed Bump Fixings 2 Pack (Product Code. 19714) or Aptus Asphalt Speed Bump Fixings 2 Pack (Product Code. 5118R). They both require 24mm diameter fixing holes.
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Date published: 2017-03-29