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  • Molding Combo
  • Contrasting Counterparts
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FM-5505 Flat Molding

3½" Height x 1" Width x 94½" Length
  • Quantity

    Per PieceThat's Only
  • 6-24

    $17.25$2.19 / foot
  • 25-49

    $15.95$2.03 / foot
  • 50-74

    $15.50$1.97 / foot
  • 75-99

    $15.10$1.92 / foot
  • 100+

    $14.65$1.86 / foot
  • Quantity
    6 minimum Need less?
6 pieces = $103.50 / 47 linear feet
  • Order a 10" Sample ($3.00)

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  • TypeCasing & Chair Rail

  • StylePlain

  • ColorWhite Primer

  • MaterialPolyurethane

  • Height3-1/2"

  • Width1"

  • Length94-1/2"


  • Product Video Placeholder Image
    Product Video
  • Product Video
    What is Architectural Polyurethane?

Product Description

Quick Facts

  • Made from dense durable Polyurethane
  • Lasts a lifetime
  • Mold and mildew resistant
  • Lightweight and easy to install
  • Safe to install indoors or out
  • Exquisite detail and design consistency
  • Won't crack or splinter like wood or hard plastic

The FM-5505 Flat Molding is a plain molding typically used for chair rail & casing or door & window trim. The molding is 3-1/2" tall and protrudes out 1".

Designed for use as chair rail, wall and ceiling relief, and door and window trim, our flat moldings are versatile, easy to install, and are the backbone of interior design. Create that amazing ceiling you've always dreamed about, update those old, boring kitchen cabinets, or create the look of wainscoting on your walls, all at a fraction of the cost.

uDecor accent features are manufactured with a dense architectural polyurethane compound (not Styrofoam) that allows them to be very durable and 100% waterproof.

A major advantage of polyurethane is that it is safe to install in rooms with the presence of moisture like bathrooms and kitchens. This product will not encourage the growth of mold or mildew.

Before you Begin -
When planning for chair rail or other moldings, inspect the walls and/or ceiling to see if any vents or other objects are within the footprint of the moldings. Consider mitered returns at the ends of any molding runs that may be interrupted by these items. Allow 48 hours for the molding to acclimatize to the conditions where it will be installed.

Painting -
Since working at waist level is usually easier than working over your head, we recommend painting the molding before beginning the installation process. Imperfections can be touched up after you have completed the install.

ALWAYS test a section of the front of the molding with your paint choice before committing to painting all of your molding. Most home latex paints work great on our molding.

Joining Pieces -
Always use an appropriate amount of adhesive on the end of any of the molding being joined end to end. This prevents the molding from separating as the house walls expand and contract from temperature changes.

Last Piece on a Wall -
For a tight fit and seams, cut the last piece that is going to be on a wall just a little long. 1/16 to 1/8 of an inch is usually enough to allow you to snap that piece in place making sure all your joints stay nice and tight.

Lining Up The Pieces -
When two pieces of molding are being joined together in a run (end to end) leave the last two feet of the open end of the installed molding loose so you can have some alignment room when you join the next piece.

Finishing The Job -
Use Spackle to fill in nail holes and painters caulk on the edges between the molding and the wall and ceiling. Touch up these areas with paint.

25 Year Limited Warranty

You're making a beautiful upgrade to your home and we're here to help protect that investment. We guarantee that your polyurethane millwork will be free from manufacturing defects for twenty-five years from the original date of purchase.

Warranty Conditions and Limitations

This warranty covers material defects in our polyurethane products when used in standard applications where temperatures do not exceed 150°F. It does not cover labor, consequential or incidental damages. This warranty is not transferable and applies to the original purchaser only.

  • Polyurethane products are for decorative uses only.
  • Polyurethane products need a finish coat of paint during installation; it is the purchaser's responsibility to make sure their paint works well with the product (test and let dry on a small piece first).
  • Before installation, allow your polyurethane product to acclimate to room temperature for 15 minutes.
  • All polyurethane moldings must be installed with tight fitting joints (see installation instructions) as well as adhesive between the joints to prevent seams from expanding during changes in season.

We're Ready to Help

Unlike a car, not much can go wrong with a polyurethane product since polyurethane doesn't absorb moisture and won't be affected by insects. However, in the rare event that you do encounter a defect with your product, we're here and ready to help. Just give us a call and we'll work with you to identify the problem and, in case of defect, supply you with replacements.

Allow 48 hours for the molding to acclimatize to the conditions where it will be installed

For more how to videos, visit our DIY learning center



5 out of 5 stars
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1 star

Samuel A.Bridgewater, NJJanuary 9, 2023

5 out of 5

Prominent chair rail molding

This molding complements the room immensely with the BB-9769 Baseboard molding, even though the room is rather small.

Mahmood U.Valley Stream, NYAugust 2, 2022

5 out of 5

Great product. Looks good

Everybody Loves it

Joe R.Crescent Springs, KYAugust 2, 2022

5 out of 5

Super support

Jason was awesome. When I called, I really wasn't sure what I wanted or needed. I told him about my project and the issues I was having. He suggested 2 different types of molding. I received them the next day and I was able to get them painted that afternoon. They were very helpful and I definitely would use them again

Hans P.Davenport, FLJune 27, 2022

5 out of 5

Great customer service

Great customer service

Harish S.Orlando, FLApril 5, 2022

5 out of 5


good shape and timely delivered

Karen G.Houston, TXDecember 20, 2020

5 out of 5

Great in every way

Bought two different products and the customer service was great, the product is better than expected and the professional installation looks terrific! Thanks uDecor!

Carole L.Austin, TXSeptember 14, 2020

5 out of 5


Your products are high quality and beautiful. So glad to have found your site. Jason was wonderful to work with and made my transaction really easy.

Scott B.Kendallville, INAugust 19, 2020

5 out of 5

Great company

Awesome customer service

Carole L.Austin, TXAugust 18, 2020

5 out of 5

I love it!

I ordered both crown molding and door and window trim. It is high quality and easy to install.

Philip P.Ocala, FLApril 13, 2020

5 out of 5

Looks great

Easy to install

James S.Sierra Vista, AZDecember 3, 2018

5 out of 5

Chair Rail

Was very easy to work with...looks great in my hall and dining room!

AnonymousAldie, VASeptember 19, 2016

5 out of 5

Very beautiful Chair railing..

Got many compliments..

AnonymousAldie, VASeptember 15, 2016

5 out of 5

Very Beautiful Chair railing

We tried a couple of samples and finally was satisfied with this many compliments..thanks uDecor..

Janince L.Sardis, MSSeptember 12, 2016

5 out of 5


High Quality

Chris C.Syracuse, UTJanuary 12, 2016

5 out of 5

Great product

We ordered this product to match the flex molding we ordered several years ago. The products are great, paint up very easily and easy to install(we used a laser level). Cant say enough great things about there customer service too!!!

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