How is carpet fitted with gripper rods?

Carpet fitting looks like the least technical floor covering and it is the one most dependent on a single skill: stretching. Gripper, underlay and trimming are all straightforward; getting the carpet genuinely tight so it does not ripple in two years is what fitters are paid for, and it is worth knowing where the line is before starting.

Safety

What you'll need

• gripper rods
• underlay and underlay tape or staples
• a knee kicker
• a carpet bolster
• a sharp trimming knife with plenty of blades
• gloves and knee pads
• a power stretcher, for larger rooms (optional)

Step by step

1. Prepare the subfloor first.Sweep and vacuum, screw down loose boards, punch down proud nails, and fix any hollows. Carpet hides less than people think and every lump telegraphs through in time.
2. Fit the gripper round the whole perimeter with the pins leaning towards the wall.The pins must point at the wall — that is the direction the stretch pulls against. Gripper fitted the wrong way round holds nothing.
3. Leave a gap between the gripper and the skirting.Roughly the thickness of the carpet, so there is somewhere for the edge to be tucked. Too tight and the carpet cannot be tucked; too wide and the edge falls into the gap.
4. Nail or bond the gripper down.Gripper comes with nails for timber; on concrete, use masonry gripper or bond it with a suitable adhesive. Over underfloor heating, adhesive rather than nails, always.
5. Fit the underlay inside the gripper, not over it.Butt it up to the inside edge of the gripper, joints butted and taped, and stapled or bonded to the subfloor so it cannot creep.
6. Lay the carpet loose with excess up the walls.Rough-cut it oversized, get it roughly square in the room and let it relax before doing anything precise.
7. Hook the carpet onto the gripper along one wall first.Usually the longest straight wall. Press it onto the pins along the whole length with the bolster.
8. Stretch across the room to the opposite wall with the knee kicker.Work in a planned sequence, kicking a section at a time and hooking it onto the gripper. The stretch is what stops rippling later, and it is the part most likely to be under-done.
9. Trim and tuck the edges.Trim close with a sharp knife against the skirting, then tuck the remaining edge down into the gap between gripper and skirting with the bolster.
10. Finish doorways with a proper threshold bar.A carpet-to-hard-floor or carpet-to-carpet profile chosen for the height difference, fixed down and gripping the carpet edge.

Tips

• Two people make this vastly easier, particularly getting a large piece of carpet into position without dragging it over the gripper.
• Change the knife blade far more often than feels necessary. A blunt blade tears backing and wanders off the line.
• Underlay quality matters more than carpet quality for how a floor feels and how long the carpet lasts.
• For a large room, a power stretcher is a different tool from a knee kicker and gives a tension a knee kicker cannot. Hiring one for a day is worth considering.

Common mistakes

• Fitting the gripper with the pins pointing into the room — The pins have to lean towards the wall so that the stretch pulls the carpet backing down onto them and tighter. Facing the other way, the tension lifts the carpet off the pins and the edges release.
• Running the underlay over the gripper — The carpet then cannot reach the pins properly, so it never grips and the edges pull free. Underlay stops at the inside edge of the gripper.
• Under-stretching the carpet — Carpet relaxes with use and with humidity. Fitted merely snug rather than genuinely stretched, it develops ripples within a year or two, and re-stretching means lifting the edges and doing the job again.

If it doesn't work

Questions people ask