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 | Closed-Cell Foam, Prevents Caulk Waste, Cuts With Scissors, Blocks Drafts Moisture Dust Insects, Indoor/Outdoor

Product ID: 5587474

Details

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

💧Closed-cell foam blocks moisture

✂️Easily cut with scissors

🛠️3/8in x 20ft perfect gap size

₱1676

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Description

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

PRECISION GAP FILLER - Perfectly sized 3/8in diameter for medium gaps, ensuring a flawless seal every time.
EFFORTLESS INSTALLATION - Simply push into gaps and trim with scissors—no adhesives or messy sealants needed.
WEATHERPROOF DURABILITY - Closed-cell foam resists moisture, dust, and insects—ideal for indoor and outdoor use.
VERSATILE HOME PROTECTION - Blocks drafts, insulates, and damp-proofs, enhancing comfort and energy efficiency.
WASTE REDUCING EFFICIENCY - Prevents caulk waste by providing a sturdy backing, saving you money and time.

The MD Building Foam Backer Rod is a 3/8in x 20ft closed-cell foam strip designed to fill medium gaps indoors and outdoors. Its weather-resistant, waterproof material blocks drafts, moisture, dust, and insects while providing a reliable base for caulking, reducing waste and improving seal durability. Easy to cut and install, it’s a versatile solution for enhancing home insulation and protection.

Specifications

ASIN	B000BQS90G
Best Sellers Rank	#5,840 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Rope Caulk #57 in Industrial Sealants #3,162 in Hardware
Brand Name	M-D Building Products
Color	Gray
Customer Reviews	4.6 4.6 out of 5 stars (1,656)
Global Trade Identification Number	00043374714647
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
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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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

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

2 weeks ago

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₱1676

Duties & taxes included

In stock

Sold byAmazon PhilippinesDelivered 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 Philippines.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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I loved the variety of products available. Will definitely shop again.

2 months ago

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