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TRIMFINITY 1/2-in x 4-1/4-in x 12-ft Colonial Finished Polystyrene Baseboard Moulding

Name: TRIMFINITY 1/2-in x 4-1/4-in x 12-ft Colonial Finished Polystyrene Baseboard Moulding
Brand: TRIMFINITY
SKU: 5015061373
Rating: 4.6 (53 reviews)

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4.6

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TRIMFINITY interior composite mouldings suit all your moulding needs, whether you are a do-it-yourselfer or a professional contractor. The 15/32-in X 4-1/4-in X 144-in colonial 620 base interior polystyrene moulding cuts, installs and fills just like wood and MDF moldings. The Trimfinity advantage is it's more durable, resistant to moisture, mold, mildew and pests. Our mouldings are also better for the planet, made of at least 90% recycled polystyrene. Use as is with our pre-finished white surface or easily paint.

620 Colonial Base Moulding
Enhance your next project with pre-finished composite moulding
Easy cut and install
Durable and Waterproof Interior Moulding
Resistant to mold, mildew and pests
Polystyrene made from over 90% of recycled materials
144-in length ideal for all job sites
For interior use
Prefinished White, Paintable

General
Package Quantity	1	Finish	Finished
Manufacturer Color/Finish	White	Style	Colonial
Edge Profile	Square	Color/Finish Family	White
Type	Baseboard	Stain Grade	Yes
Use Location	Interior	Paint Grade	Yes
Material	Polystyrene	Installation Type	Finishing nails or brad nails

Dimensions
Actual Thickness (Inches)	0	Height Measurement	4-1/4-in
Actual Height (Inches)	4.25	Thickness Measurement	1/2-in
Actual Length (Feet)	10	Length Measurement	12-ft

Features
Moisture Resistant	Yes	Finger-Joint	No
Flexible	No	Paintable/Stainable	Paintable/Stainable
Pro Package	No

Certifications
CA Residents: Prop 65 Warning(s)	No

Warranty
Warranty	None

Miscellaneous
UNSPSC	30161900

Check out the Best Selling Baseboard Moulding on Lowes.com

Review

4.6 out of 5

53 Reviews

1 Star

98% Recommend this product

Ratings may include incentivized customer reviews.

+ 1

What Customers Are Saying

Customers overwhelmingly praise this baseboard for exceptional moisture resistance, modern aesthetic, and straightforward installation. The material reliably resists warping, swelling, and water damage in bathrooms and damp areas where traditional options fail. Reviewers highlight the clean, bright appearance that modernizes spaces, with many noting the prefinished white finish requires no painting. Installation is consistently described as easy, with customers successfully cutting and installing using standard tools. A few mention the material sounds hollow when struck and can melt if cut incorrectly, while some note inconsistent white tones between batches. Overall, most customers consider it a superior, worry-free alternative for moisture-prone areas.

Customer review summary generated by AI, including incentivized reviews.

53 Customer Reviews

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Worked well for bathroom baseboard trim

Would Recommend

It was easy to cut with a miter saw. I attached it with adhesive as baseboard avoiding nail holes. I left it the natural color so I don't know how it paints. I did drop one piece and it dented. So not sure how well it will hold up over time. It does look nice, my wife is happy. It worked well for finishing the bathroom as I removed vinyl baseboard trim and this was wide enough to fully conceal what the trim left behind upon removal

RogerJuly 13, 2026
Verified PurchaserIncentivized

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/48a8c6e6-33c6-56e4-ae3b-42cde3fc9eaf

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/1675e3dc-311a-5113-a8cd-9cf290f1f443

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/44511944-2131-5e3e-b5cb-b0d7fc251813

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Great baseboard for bathrooms

Would Recommend

Looks great, love that it doesn’t warp if it gets wet so it’s perfect for bathrooms

Stephanie PorterJuly 5, 2026
Verified PurchaserIncentivized

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/00bb8a1e-9c80-5b91-8a43-75954cf8acdf

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Water-resistant, looks good, but can melt when cut

Would Recommend

This is a great option for use in a bathroom or laundry room; unlike MDF and wood, it's water-resistant. If you cut it with a many-toothed blade on a miter saw (as I did) be quick; it melts and burns easily.

bobboJune 21, 2026
Verified PurchaserIncentivized

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Seems to work fine

Would Recommend

After a few trial and error cuts, I learned that you have to cut this fast. I did notice that dents pretty easy.

TinmanJune 20, 2026
Verified PurchaserIncentivized

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Order was processed very quickly.

Would Recommend

Very solid and reliable material. I was impressed how nice the product looked and condition it was in when I picked it up at the store.

Jim BJune 14, 2026
Verified PurchaserIncentivized

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Better than MDF

Would Recommend

The is molding was exactly what I needed. It cut easily and even matched without painting which was a huge bonus. Installed in a bathroom where previous MDF swelled when absorbed water. Feeling satisfied that will no longer be an issue.

SounderHoundJune 5, 2026
Verified PurchaserIncentivized

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Preprimed

Would Recommend

Water proof

Jerk69June 3, 2026
Verified Purchaser

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7 Questions

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What is this baseboard finished with? Or is it just bare polystyrene?

Why isn't this available anymore?

Can you install this with 18 GA brads from a pneumatic nailer, or will it crack/split?

What do you use to clean it with? Does it turn yellow over time?

Does it stain?

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COMPARE PRODUCTS

		Name	Current Item TRIMFINITY1/2-in x 4-1/4-in x 12-ft Colonial Finished Polystyrene Baseboard Moulding
		Ratings	52
		Material	Polystyrene
		Finish	Finished
		Type	Baseboard
RELIABILT1/2-in x 4-1/4-in x 8-ft Colonial Primed MDF 620 Baseboard Moulding	Royal Building Products9/16-in x 3-1/4-in x 12-ft Colonial Finished PVC WM623 Baseboard Moulding	TRIMFINITY9/16-in x 4-1/2-in x 8-ft Craftsman Finished Polystyrene Baseboard Moulding	TRIMFINITY9/16-in x 5-1/4-in x 8-ft Colonial Finished Polystyrene Baseboard Moulding	RELIABILT1/2-in x 4-1/4-in x 12-ft Colonial Primed MDF 620 Baseboard Moulding	RELIABILT15/32-in x 4-1/2-in x 12-ft Craftsman Primed MDF 3214 Baseboard Moulding	TRIMFINITY9/16-in x 5-1/2-in x 8-ft Craftsman Finished Polystyrene Baseboard Moulding	RELIABILT15/32-in x 5-1/2-in x 12-ft Craftsman Primed MDF 3210 Baseboard Moulding 6 -Pack	RELIABILT1/2-in x 5-1/4-in x 8-ft Colonial Primed MDF 163E Baseboard Moulding
1347	236	2	3	1347	1343	6	10	348
MDF	PVC	Polystyrene	Polystyrene	MDF	MDF	Polystyrene	MDF	MDF
Primed	Finished	Finished	Finished	Primed	Primed	Finished	Primed	Primed
Baseboard	Baseboard	Baseboard	Baseboard	Baseboard	Baseboard	Baseboard	Baseboard	Baseboard