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Pre-Wall Detail

Pre-Wall Substrate Cutline Standard

The cutline is the edge of the substrate where it meets a device, a speaker grille, or a lighting channel. Tolerances on that edge determine whether the finished reveal is straight or wavy.

What This Standard Covers

  • Cutline tolerance by device type
  • Substrate edge prep (taper, scoring) before plaster finish
  • Recommended tools and techniques for clean cutlines
  • Pass/fail examples with photographic reference

Who It Is For

  • Plasterers and drywall finishers
  • Trim carpenters routing channels
  • Inspectors signing off the finish

When To Use It

  • At substrate prep
  • During the finish coat
  • At the punch-list walk

Read or Download the PDF

The full standard, including diagrams, tolerance tables, and pass/fail photographic references, is in the embedded PDF below. You can read it inline or download it for your jobsite folder.

Your browser does not display embedded PDFs. Download Pre-Wall Substrate Cutline Standard (PDF).

Field Notes

A wavy cutline is the giveaway. It tells the eye that something was finished around rather than into. We hold a tight cutline tolerance because the eye reads the transition from substrate to device, and a clean transition reads as luxury.

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