8500 Standard Knee Wall Cap


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Rise & Run Details

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Please Note - If your staircase contains a variable rise and run from step to step, you will need to work with a Project Manager after the sale to engineer the system.

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Ships in about 15 Business Days

Product Description

The versatile 8500 Standard Knee Wall Cap may be installed on an angled knee wall or on a flat surface. These caps provide a secure surface to install balusters, and the high-quality wood coordinates with wood treads. With every detail accounted for, your new stairway will make a beautiful impression.

Key Features

  • Slim Design
  • Rounded or Square End Options
  • Stain-grade Wood


The Standard Knee Wall Cap is designed to fit over most 2×4 walls with drywall. Mount using a combination of high-quality wood glue and trim nails for a secure installation.

Product Specifications


  • Width: 6 ¾”
  • Thickness: ¾”
  • Length: 4’ – 16’


We welcome your special request for Standard Knee Wall Caps. Contact our friendly customer service team today to get the perfect fit for your home.

Clear Finish & Stain Information

StairSupplies™ offers several premium stain and finish options for our products, depending on the product’s use. For Knee Wall Caps, we offer both clear finishes and stains. Select a clear finish if you want to draw out the natural beauty and colors of the wood. If you prefer deeper, richer tones, our custom-mixed stains are the ideal choice for your Knee Wall Caps.

All tread materials and products that are used underfoot are finished with a Conversion Varnish. Strong and resilient, this varnish is standard in the hardwood flooring industry. Our team of experts apply this specialty product onto each stair tread using a spray applicator for even, flawless coverage to protect your treads against heavy wear and tear.

Wood Grain & Color Variation

At StairSupplies™ we believe that natural wood colors and visual textures add character to our products. With that in mind, we strive to match the grain and color of all of our wood products as closely as possible. However, due to the natural variation of wood products, there may be instances in which a perfect grain and color match is not possible. By ordering from StairSupplies™, you acknowledge that you are receiving a uniquely crafted product and there may be some variation in the grain and color of your wood products.

Interior Use Only

This product may contain glue joints and is designed for interior use only.

Completed Projects

This product has been used in the following "Completed Projects"

    Product Q&A

    6 years 1 month ago

    Is this what is used on a closed stringer and can this be used with Hollow Double Twist iron Balusters?

    6 years 1 month ago

    Hi Amy,

    Thank you for your question. The 8500 Standard Knee Wall Cap can be used with closed stringers or angled walls to provide a finished look to your staircase. You can also mount any of our iron balusters to this knee wall cap. If you have any additional questions, or would like some design assistance, give us a call at 1 (866) 226-6536.

    The StairSupplies Support Team

    5 years 1 month ago

    Can this be manufactured in a 4″ width?

    5 years 1 month ago

    Thanks for the question Jason.

    A 4″ width would be a special order that you could arrange by calling one of our specialists at (866) 226 6536 during our regular business hours – M-F 9:00am to 5:00 pm eastern time.


    StairSupplies Customer Support