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)

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

9527 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal smarter, not harder — the pro’s secret weapon!

SEAL LIKE A PRO - Creates a perfect sound and draft barrier for concrete gaps and expansion joints
DURABLE DEPENDABLE - Crafted from resilient gray foam that withstands weather and time
CUSTOM FIT EVERY TIME - Easily trims with scissors to fit any gap size, even twist multiple rods for larger openings
VERSATILE APPLICATION - Ideal for driveways, sidewalks, and all your caulking projects
SAVE CAULK SAVE MONEY - Acts as an essential caulk saver by providing a solid backing surface

The M-D Building Products Versatile Gray Foam Backer Rod is a 3/8-inch by 20-foot foam rod designed to fill and seal large concrete gaps, expansion joints, and cracks. Made in the USA, it provides a durable backing for caulking, preventing drafts and enhancing weatherproofing in driveways, sidewalks, and other construction projects.

Specifications

ASIN	B000BQS90G
ASIN	B000BQS90G
Best Sellers Rank	#87,205 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #523 in Hardware Sealers
Brand Name	M-D Building Products
Color	Gray
Customer Reviews	4.6 4.6 out of 5 stars (1,619)
Customer reviews	4.6 4.6 out of 5 stars (1,619)
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
Number of Packs	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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