Application
Dowel Drilling for Slab Connections
Drilling dowel holes to tie new slabs to existing concrete and transfer load across joints and repairs.
When new concrete meets existing concrete — a slab extension, a repair patch, a curb tie-in — dowels transfer load across the joint and keep the two pours working together instead of drifting apart. Dowel drilling puts precise holes into the existing concrete at the right depth and spacing so epoxied or grouted dowels develop their full capacity.
Crews we route work to drill dowel holes to the structural detail's diameter, embedment, and spacing. Consistent hole depth and clean holes matter: an under-embedded or dust-filled hole won't hold the dowel, and the joint fails to transfer load.
Drilling method
Dowel holes are drilled with the same rotary and core techniques used in concrete core drilling, sized to the dowel and adhesive. Related fastening work overlaps with anchor bolt coring. Where the new pour ties into a saw-cut edge, slab sawing squares the existing concrete first.
Concrete scanning locates existing rebar and post-tension so dowel holes don't strike reinforcement — critical along the edges of post-tension slabs common in Houston.
Practical considerations
- Hole diameter, depth, and spacing follow the structural dowel detail.
- Holes are cleaned so the adhesive or grout bonds and the dowel develops capacity.
- Dry drilling with dust collection or wet drilling controls silica per OSHA 1926.1153.
- Scanning keeps dowel holes clear of tendons and existing rebar.
Clean holes hold dowels
Adhesive dowels only reach full capacity in clean, correctly sized holes. Hole prep is part of the job, not an afterthought.
Dowel drilling FAQs
- What determines dowel hole depth and spacing?
- The structural dowel detail specifies diameter, embedment depth, and spacing. Crews drill to those figures so the dowels transfer load as designed.
- Can you drill dowels along a post-tension slab edge?
- Yes, after scanning. The slab edge is scanned to locate tendons and rebar so the dowel holes stay clear of them.
- How are the holes prepared for adhesive?
- Holes are cleaned of dust and debris so the epoxy or grout bonds properly — a key step for the dowels to develop capacity.
- How many dowels can you drill?
- From a handful for a small repair to long runs along a slab tie-in. Share the layout through request-pricing for a scoped plan.
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