how many feet come in a 3 pk?

Both INDIVIDUAL packs - the 3/8" and the 1/2"- are 20 feet long.

no 1/4" one? either 20 or 50ft?

Not in this brand, but Amazon offers 1/4-inch backer rod in various lengths, from 10 feet to 100 feet, from other brands. Just search on "Backer Rod 1/4 Inch".

can the backer rod be sliced for smaller openings?

I have not done that, but it cuts easily with a sharp knife or scissors, so you should be able to slice it to fit whatever opening you have. It's good stuff!

Can his be used for exterior windows before caulking?

I used it to push into larger cracks in my driveway before applying concrete filler, and it worked great. I'm thinking that it should work well for filling in spaces around your windows prior to caulking.

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MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps

MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps

Product ID: 5587474

Details

Brand
M-D Building
Color
Gray
Item Form
Foam
Item Weight
17.01 g
Surface Recommendation

✂️Easily trimmed to fit

🌧️Weather-resistant & waterproof

🛠️3/8in x 20ft perfect gap size

€ 23.51

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Description

🛡️ Seal Smart, Live Comfortable: The Ultimate Gap Guardian

VERSATILE HOME ARMOR - Blocks drafts, moisture, dust, and insects—your all-in-one gap defense.
CAULK WASTE NOT HERE - Closed-cell foam backing maximizes caulk adhesion and minimizes waste.
CUT TO SIZE CONVENIENCE - Trim with scissors for a custom fit—no mess, no fuss.
BUILT TO BRAVE THE ELEMENTS - Durable, waterproof foam stands strong indoors and outdoors, rain or shine.
PRECISION FIT FOR SMALL GAPS - Snug 3/8in diameter ensures airtight sealing and draft prevention.

The MD Building Foam Backer Rod is a 3/8in x 20ft gray closed-cell foam designed for sealing small gaps indoors and outdoors. Weather-resistant and waterproof, it provides a durable base for caulking, preventing drafts, moisture, dust, and insects. Easily trimmed and installed, it enhances insulation and extends caulk life, making it a top-rated, versatile solution for professional-grade gap filling.

Specifications

ASIN	B000BQS90G
Best Sellers Rank	#2,184 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Rope Caulk #23 in Industrial Sealants #1,029 in Hardware
Brand Name	M-D Building Products
Color	Gray
Customer Reviews	4.6 4.6 out of 5 stars (1,661)
Included Components	MD Building - 71464 - 2pk
Item Form	Foam
Item Type Name	MD Building - 71464 - 2pk
Item Weight	17.01 g
Manufacturer	M-D Building Products
Material Type	Rubber
Model	71464
Number of Items	1
Number of Packs	1
Part Number	71464
Surface Recommendation	surface_recommendation
UPC	043374714647
Unit Count	1 Count
Warranty Description	All M-D products are warranted to be free from defects in material and workmanship if installed and used in strict accordance with our installation instructions.
Water Resistance Level	Waterproof

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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€ 23.51

Duties & taxes included

In stock

Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to France.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

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