Carpet

Choosing a Rubber Reducer Profile

Choosing a rubber or vinyl reducer by height difference and floor pair, with the ADA's 1/4 and 1/2 inch rules and CRI's carpet edge rule.

Updated · 2 min read

A reducer takes the edge of a floor down to the next surface without a trip hazard. Pick it by two things: the height you're covering, and what's on each side.

Start with the ADA rules

On accessible routes, ADA section 303 sets the limits.[1]

Height change Requirement
Up to 1/4" May be vertical
1/4" to 1/2" Must be beveled, no steeper than 1:2
Over 1/2" Must be a ramp

A reducer covers the first two rows. Over 1/2", build up the low side or use a ramp. See Transitions and thresholds.

Reducer types

Manufacturers group profiles by what they connect. Johnsonite's reducer line is a good example.[2]

  • Reducers (material to floor): take one floor down to a lower surface. Johnsonite lists these from 1/16" up to 1/2".
  • Adaptors: join two different materials of different heights, for example 1/4" to 1/8".
  • Material-to-substrate / overlap: lap over the edge of the flooring and ramp to bare concrete. Common at the edge of a phased job.
  • Carpet reducers: made for glue-down carpet edges.

Carpet edges

The residential carpet standard requires a transition molding where carpet meets another floor. With no molding, the hard floor can be at most 1/16" higher than the carpet, and you run a 1/8" bead of seam sealer along the carpet edge (section 5.4).[3]

How to pick

Work through these in order.

  1. Measure both finished floor heights, including adhesive and underlayment.
  2. Subtract to get the height the reducer has to cover.
  3. Identify the floor pair: resilient to concrete, carpet to resilient, tile to resilient, and so on.
  4. Choose the profile family for that pair, sized to the height.
  5. Check the taper. Johnsonite's 1/4" and 3/8" profiles taper over 1-1/2"; the 1/2" over 2".[2]

Installing it

Rubber and vinyl reducers go down with adhesive.

  • Use the adhesive the reducer maker specifies.
  • Cut to length and dry-fit before gluing.
  • Roll with a hand roller after setting. Johnsonite specifies a J-roller.[2]
  • Use one continuous piece across a doorway.

Common mistakes

Most reducer problems come from sizing.

  • Measuring before underlayment or adhesive.
  • A reducer over a 1/2" change on an accessible route. That needs a ramp.[1]
  • Short pieces in a doorway.
  • Carpet edge left without a transition.

Reducers we carry

These are the Burke and metal profiles we stock.

References

  1. U.S. Access Board: 2010 ADA Standards
  2. Johnsonite (Tarkett): Reducer moulding specifications
  3. CRI 105: Residential carpet installation standard

Linked PDF documents are archived copies saved by PreFloor Tools so they stay available if the publisher moves or removes them. Check the publisher's website for the latest revision.

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