Is it safe to use near hot water baseboard radiators? I want to use it behind radiator cover as a temporary fix for a cold draft.

I suspect it would be safe if between the wall and the top cover of the baseboard, assuming you have standard baseboard covers like mine -- which never get super hot. It's foam, and will likely melt if too close to a heat source. To be on the safe side, I'd suggest first contacting the company directly.

I live in an apartment and i feel a draft coming through the cracks of my window would this help? Im trying to avoid using weather tape

I purchased the medium backer rod and they are 1/2" thick. I think the one I purchased would be too thick to insert into the crack of your windows. Maybe there is a smaller version that would work for you.

What caulking do u need for this ?

I did use caulk as it was used to support a garage door seal as the bottom of the door.

（エムディー・ビルディング・プロダクツ）M-D Building Products 71480 バッカーロッド 1/2インチ×20フィートグレー- 1 Pack 71480 1 [並行輸入品]

（エムディー・ビルディング・プロダクツ）M-D Building Products 71480 バッカーロッド 1/2インチ×20フィートグレー- 1 Pack 71480 1 [並行輸入品]

Product ID: 742895661

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Details

Brand
M-D Building
Color
gray
Item Weight
0.02 Pounds
Maximum Gap Fill
0.5 Inches
Surface Recommendation
wall

📏0.5-inch max gap fill

🧰Lightweight 0.02 lbs

🛡️Water resistant polyethylene

Description

🛠️ Seal smart, save big — the pro’s choice for gap filling!

BUILT TO LAST - Durable polyethylene material resists water and weather damage
SAVE ON CAULK - Cushions and insulates, reducing caulk usage and costs
SEAL LIKE A PRO - Fills large gaps up to 1/2 inch for flawless insulation
PEST PROOF YOUR SPACE - Effectively blocks pests from sneaking through cracks
EFFORTLESS INSTALLATION - Lightweight and easy to handle for quick, professional results

The M-D Building Products 71480 Backer Rod is a 1/2-inch by 20-foot gray polyethylene foam rod designed to fill large gaps before caulking. Water resistant and lightweight, it insulates, cushions, and prevents pest intrusion in walls, pavements, and foundations. Highly rated with 4.6 stars, it’s a trusted solution for professional-grade weatherization and gap sealing.

Specifications

ASIN	B000BQWOC0
Brand Name	M-D Building Products
Color	gray
Customer Reviews	4.6 4.6 out of 5 stars (3,697)
Global Trade Identification Number	00043374714807
Item Weight	0.02 Pounds
Manufacturer	M-D Building Products
Material Type	Polyethylene (PE)
Maximum Gap Fill	0.5 Inches
Surface Recommendation	wall
UPC	043374714807
Unit Count	1.0 Count
Water Resistance Level	Water Resistant

Reviews

R**I

Cost is too much.. Similar products are available in lowest prices..

23.11.2018

A**I

Excellent to use. Easy to install and does save on caulk. Keeps pests out!

27.02.2026

N**I

I’ve been using very thin backer rod for posting my dog’s ears, and it’s been a fantastic solution! It’s lightweight, flexible, and provides just the right amount of support without causing any discomfort. It’s easy to cut to size and stays in place securely. Plus, it’s gentle on the ears and works perfectly with sports tape. Highly recommend for anyone looking for a reliable and comfortable ear-posting method!

31.12.2024

F**S

Me gusta como funciona el Backer-rod es para rellenar los costados entre espacio entre la ventana y la pared para no gastar demasiado silicon

12.02.2026

D**H

All Doggy people should use this ,who post their puppy's ears.Excellent stuff.

17.03.2018

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