Why you usually do not need to drill
Concrete is a stable base. You can create the cup recess above the slab instead of inside it. Two proven approaches deliver clean, reliable results without coring the concrete.
- Interlocking base panels form built-in cup cavities for full depth putting cups on concrete.
- Shock pad builds accept shallow cups or drop-in targets that sit flush under the turf.
Method 1: Modular base panels for full-depth cups
What this is
Rigid, interlocking polymer panels create a raised, level base. Panel geometry includes voids that accept standard 4.25 inch diameter cups at full depth.
Why it works
- The panel cavity replaces a cored hole, so no slab drilling.
- Panels distribute load, improve drainage, and keep cups square and stable.
- Ideal for permanent or semi-permanent greens on patios, rooftops, and studios.
Install steps
- Prep slab: sweep clean, remove high spots or debris, confirm slope is 1 to 2 percent away from structures.
- Dry lay panels: interlock tightly, stagger seams, and confirm footprint.
- Place cups: drop cup sleeves into panel cavities and confirm lip height vs turf pile.
- Adhere panels if needed: use perimeter beads of compatible construction adhesive.
- Cut turf holes: lay turf, locate cup centers, cut clean 4.25 inch circles, and test fit.
- Seam and bond: use seam tape with urethane adhesive, then perimeter-bond turf to the slab or to a glued nailer strip.
- Roll and infill: cross-roll to relax, then add infill per turf spec and set flagsticks.
Method 2: Shock pad with shallow or drop-in cups
What this is
Elastic foam or rubber pad underlayment builds height and smooths minor slab variations. Shallow cup hardware or low-profile targets sit in pad cutouts so the cup lip finishes flush with the turf.
Why it works
- No drilling. The pad provides the recess depth for the cup or target.
- Fast, clean setup that is easy to relocate or modify.
- Great for simulators, garages, rentals, and multi-use spaces.
Install steps
- Prep slab: clean, dry, and verify slope. Fill wide cracks with a non-shrink repair mortar.
- Lay pad: tape seams, keep edges tight. Typical thickness 8 to 20 mm.
- Place cups: mark locations, cut neat pad recesses for shallow cups or targets, and test lip height with turf on top.
- Bond layers: light spray or beads of compatible adhesive to hold pad and cup collars in place.
- Install turf: seam with tape and urethane adhesive, perimeter-bond as required.
- Finish: roll the surface and dress infill if specified.
Choosing your cup hardware
Full-depth cups
- Diameter: 4.25 inches. Depth: typically 4 to 6 inches.
- Requires modular panels or another raised base to create the cavity on concrete.
- Best for realistic ball drop, sound, and flagstick fit.
Shallow cups and targets
- Depth: about 1 to 2 inches. Some are solid pucks with printed targets.
- Fits shock pad builds without drilling.
- Best for fast installs, relocations, and low-profile surfaces.
Surface prep checklist
- Clean, dry concrete, free of dust, oil, and loose paint.
- Slope away from structures 1 to 2 percent for outdoor installs.
- Feather grind proud ridges and fill wide cracks for a smooth base.
- Plan perimeter terminations with thresholds, edging, or glued nailer strips.
Adhesion and seaming on concrete
- Use turf-rated urethane adhesive and seam tape for field seams.
- Perimeter-bond turf with continuous beads. Avoid puddles that telegraph.
- In removable builds, use heavy-duty double-sided tape at the perimeter instead of adhesive.
Drainage, indoor vs outdoor
- Indoors: dry slab is mandatory. Consider vapor barriers in moisture-prone spaces.
- Outdoors: rely on slab slope. Do not trap water under panels or pad. Leave weep paths at edges.
When drilling still makes sense
- You refuse any raised base yet want true full-depth cups in the slab.
- You need a specialty ball return system that routes through the concrete.
- A permanent, high-traffic commercial spec requires mechanical anchoring at the cup.
If you choose to core, hire a pro with wet coring gear and dust control. Verify utilities beneath the slab before any cutting.
Common mistakes to avoid
- Cutting turf holes before test-fitting cup height with panels or pad in place.
- Under-bonding perimeters, which leads to edge curl.
- Skipping slab cleaning, which weakens adhesion.
- Ignoring slope, which can trap water outdoors.
Tools and materials
- Interlocking base panels or shock pad underlayment
- Full-depth cups or shallow cups or targets
- Turf-rated urethane adhesive and seam tape
- Utility knife with sharp hooked blades, 4.25 inch hole template, straightedge
- Heavy roller, broom, and vacuum
Quick spec guide
- Full-depth on concrete: panel base 1 to 2 inches thick with integrated cup cavities.
- Shallow on concrete: pad 8 to 20 mm with low-profile cups or targets, pad recess cut to set lip flush.
- Edge finish: glue-down to slab or to glued composite nailer strips for a crisp perimeter.
