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

🌧️Waterproof & weather-resistant

🛠️3/8in x 20ft precision sizing

€ 23.51

Duties & taxes included

In stock

Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Seal smart, save big—your gap’s new best friend!

VERSATILE HOME ARMOR - Ideal for insulating doors, windows, driveways, and more—boost your home's airtightness and comfort.
PERFECT FIT EVERY TIME - Precisely sized 3/8in thickness ensures a snug, draft-blocking seal for medium gaps.
EFFORTLESS INSTALLATION - Push-in design and easy-to-cut foam make sealing gaps a quick, mess-free task.
CAULK SAVER EXTRAORDINAIRE - Creates a sturdy base that prevents caulk waste and enhances adhesion for long-lasting seals.
BUILT TO BRAVE THE ELEMENTS - Durable, waterproof foam stands strong indoors and outdoors, resisting moisture, dust, and insects.

The MD Building Foam Backer Rod is a 3/8in x 20ft gray closed-cell foam designed to fill medium gaps with precision. Waterproof and weather-resistant, it provides a durable, flexible base for caulking, preventing drafts, moisture, dust, and insect intrusion. Easy to trim and install, it’s perfect for both indoor and outdoor use, enhancing insulation and extending the life of your sealants.

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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