• Dori

Oops..Drilling Asphalt, I Hit a Rock



Installing our BoltHold anchors requires drilling a 1” hole in the asphalt and the layers below it. The depth of the hole is 6” or 12” depending on the length of the anchor.

Usually, once past the asphalt layer, drilling offers low resistance. It takes about the same effort to drill 6” or 12”. However, if you hit a rock, you may find it to be very time consuming to drill a 1” hole through the rock.

We have found that drilling a smaller hole first makes the task go faster. Drill a ⅜” (10mm) hole through the rock to the required depth, then re-drill with ½” and progress to 1”.

We recommend using the small 3/8" drill bit as a pilot hole in all cases. The reason is that asphalt tends to kick the drill before it is truly seated in the hole, because asphalt contains fine gravel and the drill bounces off these.


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Asphalt Anchors Corp.

OFFICE: 10 Ridge Road (by appointment only)

West Orange, NJ 07052 USA

WAREHOUSE: Hillside NJ 07205 (by appointment only)

Tel: +1 973 669-8214

Fax:+1 973 669-5161

email:  marketing@asphaltanchors.com

D-U-N-S 117246457

VAT 328790569    FEIN 81-4256169