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: 5587474

Details

Brand
M-D Building
Color
Gray
Item Form
Foam
Item Weight
0.6 Ounces
Surface Recommendation

✂️Easily trim to fit any joint size

🌧️Weather-resistant & waterproof

🛠️3/8 inch diameter for medium gaps

$47.81

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal smarter, not harder — the pro’s choice for flawless gaps!

TRUSTED CAULK BASE - Creates a reliable foundation for caulking that lasts, saving you time and money on repairs.
EFFORTLESS INSTALLATION - Push in place and trim with scissors—no adhesives or mess required.
DURABLE WEATHERPROOF SEAL - Built to withstand rain, sun, and temperature swings for year-round protection.
PRECISION FIT FOR MEDIUM GAPS - 3/8 inch thickness ensures a snug, draft-blocking fit in concrete and expansion joints.
VERSATILE INDOOR OUTDOOR USE - Perfect for sealing windows, doors, driveways, and more, enhancing insulation and comfort.

The M-D Building Products Versatile Gray Foam Backer Rod is a 3/8 inch thick, 20-foot long foam rod designed to fill medium-sized gaps and expansion joints. Made from durable, weather-resistant rubber foam, it provides a waterproof, airtight base for caulking applications both indoors and outdoors. Easy to install and trim, it prevents drafts, dust, and moisture infiltration, enhancing insulation and extending the life of your sealants.

Specifications

ASIN	B000BQS90G
Best Sellers Rank	#54,564 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #9 in Rope Caulk #346 in Industrial Sealants #29,621 in Hardware
Brand	M-D Building Products
Brand Name	M-D Building Products
Color	Gray
Customer Reviews	4.6 out of 5 stars 1,657 Reviews
Global Trade Identification Number	00043374714647
Included Components	MD Building - 71464 - 2pk
Item Form	Foam
Item Type Name	MD Building - 71464 - 2pk
Item Weight	0.6 Ounces
Manufacturer	M-D Building Products
Material Type	Rubber
Model	71464
Number of Items	1
Part Number	71464
Surface Recommendation	surface_recommendation
UPC	043374714647
Unit Count	1.0 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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