Frequently Asked Questions About Interior Wood Thresholds

Frequently Asked Questions About Interior Wood Thresholds

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Why Use Interior Door Thresholds?

Interior thresholds are used for several practical reasons:

• To create a smooth transition between different flooring materials

• To accommodate height differences between floors (e.g., 1/4", 1/2", or more)

• To cover gaps between rooms, especially in renovations or additions

• Available in widths up to 6 1/2", or up to 13" with 2-piece systems

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Can Wood Thresholds Be Used as a Thermal Break?

• Most doors have a 1/2"–3/4" gap underneath

• An ADA threshold (1/2" height) can help reduce airflow and close much of this gap

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What Types of Hardwood Thresholds Are Available?

• Standard thresholds – cover small height differences between floors

• Wide thresholds – extend further over one flooring surface

• Flat thresholds with tapered edges:

  • Available in 1/2" (ADA) and 3/4" heights

  • Used for accessibility or to cover gaps

  • Widths from 3 1/2" to 6 1/2" (up to 13" with 2-piece designs)

• Tapered thresholds:

  • Up to 6 1/2" wide

  • Taper from 3/4" down to 1/4" or less

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How Do You Install Interior Wood Thresholds?

Important tips:

• Do not simply nail directly into the floor — this can crack the wood

• Always ensure the surface underneath is solid and level

Recommended methods:

• Nailing method:

  • Drill pilot holes first

  • Use finishing nails and a nail punch

  • Fill holes after finishing

• Adhesive method (preferred for concrete):

  • Use construction adhesive

  • Ensure a stable, flat base

Key reminder:
A solid, even base is critical—thin areas of the threshold (as little as 1/4") can crack under pressure if unsupported

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Do Thresholds Need to Be Finished Before Installation?

Yes. Thresholds are shipped unfinished:

• Must be stained or painted before installation

• Finish all sides to prevent moisture absorption

• This helps avoid warping, especially on wider or longer pieces

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What If My Floors Are Different Heights?

You have two main options:

1. Butt-Up Transition:

• Threshold meets the higher floor directly

• Creates a smoother, safer transition

• Best for larger height differences (e.g., 1/2"–3/4")

2. Overlapping Transition:

• Threshold spans across both floors

• Helps bridge smaller height differences ( 1/4"–1/2")