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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M-D Building Products - Versatile Gray Foam Backer Rod - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling, 3/8 by 20 Feet (71464)

M-D Building Products - Versatile Gray Foam Backer Rod - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling, 3/8 by 20 Feet (71464)

Product ID: 270390717

Details

Brand
M-D Building
Colour
Gray
Item form
Foam
Item weight
0.6 Ounces
Maximum gap fill
0.38 Inches

📏20 feet length for extensive coverage

🇺🇸Made in USA quality assurance

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Description

🛠️ Seal smarter, save bigger – the ultimate caulk saver for flawless finishes!

CUT TO FIT - Easily trimmed with scissors for custom sizing on any project.
SEAL LIKE A PRO - Perfectly fills large gaps and expansion joints to block drafts and moisture.
TRUSTED QUALITY - Manufactured in the USA with a 4.6-star rating from over 1,500 satisfied users.
DURABLE RELIABLE - Closed-cell polyethylene foam resists absorption, ensuring long-lasting performance.
VERSATILE APPLICATION - Ideal for concrete cracks, driveways, sidewalks, and window or door frames.

The M-D Building Products Versatile Gray Foam Backer Rod is a 3/8-inch diameter, 20-foot long closed-cell polyethylene foam rod designed to fill large gaps and expansion joints. Made in the USA, it provides a durable, non-absorbent surface that enhances caulking efficiency and insulation in concrete, driveways, sidewalks, and window or door cracks. Highly rated for its ease of use and reliable performance, it’s a must-have for professional-grade weatherization and sealing projects.

Specifications

ASIN	B000BQS90G
ASIN	B000BQS90G
Best Sellers Rank	#69,493 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #442 in Hardware Sealers
Brand Name	M-D Building Products
Color	Gray
Customer Reviews	4.6 4.6 out of 5 stars (1,580)
Customer reviews	4.6 4.6 out of 5 stars (1,580)
Date First Available	17 August 2012
Department	Unisex-Adult
Global Trade Identification Number	00043374714647
Included Components	MD Building - 71464 - 2pk
Is Discontinued By Manufacturer	No
Item Form	Foam
Item Type Name	MD Building - 71464 - 2pk
Item Weight	0.6 Ounces
Item model number	71464
Manufacturer	M-D Building Products
Manufacturer	M-D Building Products
Material Type	Rubber
Maximum Gap Fill	0.38 Inches
Model	71464
Number of Items	1
Part Number	71464
Product Dimensions	35.56 x 20.32 x 5.08 cm; 17.01 g
Surface Recommendation	wall
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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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.

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TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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9016 som

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In stock

Sold byAmazon KyrgyzstanDelivered 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 Kyrgyzstan.

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TrustScore 4.5 | 7,300+ reviews

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