DIY Guide or Flexible Trim for Tricky Stair Moulding

User is looking for advice on installing moulding/trim on complex, angular stairs.

Product/Service Opportunities:

  1. Product Suggestion (Information Resource): "The Ultimate DIY Guide to Complex Stair Trim Installation" (e-book or video series).

    • Content: Detailed visual instructions, techniques for measuring and cutting compound angles for stairs like the one shown, choosing appropriate trim profiles, and finishing tips for a professional look.
    • Expected Benefit: Helps homeowners take on challenging stair trim projects with confidence, saving money on professional labor and achieving a high-quality finish.
  2. Product Suggestion (Physical Product): "Modular Adjustable Stair Trim System."

    • Description: A system of pre-formed trim pieces with flexible/adjustable connectors or corner pieces designed to fit a wide range of angles found on non-standard stairs. It could include specific pieces for inside/outside corners on rake angles and transitions to level runs. Made from paintable, durable material.
    • Expected Benefit: Simplifies the installation of trim on complex stairs by reducing the need for precise, difficult miter cuts. Allows DIYers to achieve a cleaner, more professional look with less skill and specialized tools.

Origin Reddit Post

r/homeimprovement

Need advice - How would you do the moulding here?

Posted by u/Riffus_Iommicus05/29/2025
https://imgur.com/a/kEy06BH What kind of moulding/trim would you use and how would you do it to make it look decent on these stairs? I’m finishing my basement and this is the last thing to

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