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.

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MD Building Foam Backer Rod, Gray, 1/2in x 20ft for Medium Gaps

MD Building Foam Backer Rod, Gray, 1/2in x 20ft for Medium Gaps

Product ID: 4877844

Details

Brand
M-D Building
Color
Gray
Item Form
Specialty
Item Weight
9.07 g
Maximum Gap Fill
0.5 inches

✂️Easily cut to size

🌧️Waterproof closed-cell foam

🛠️0.5in max gap fill

RM92

Duties & taxes included

In stock

Sold byAmazon MalaysiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Seal the gap, save the day — don’t let drafts crash your vibe!

BUILT TO LAST - Weather-resistant closed-cell foam ensures durable indoor/outdoor performance.
SEAL LIKE A PRO - Effortlessly blocks drafts, moisture, dust, and insects for year-round comfort.
VERSATILE GAP SOLUTION - Ideal for expansion joints, window sills, doors, roofs, and concrete cracks.
PRECISION FIT EVERY TIME - Flexible 1/2 inch thickness adapts to medium gaps and trims cleanly with scissors.
CAULK SMARTER NOT HARDER - Creates a perfect base to prevent caulk waste and improve adhesion.

The MD Building Foam Backer Rod is a 1/2 inch thick, 20-foot roll of closed-cell, waterproof foam designed to fill medium gaps. It enhances caulking durability by providing a stable base, blocks drafts, moisture, dust, and insects, and is easy to cut and install for both indoor and outdoor weatherproofing needs.

Specifications

ASIN	B000BQWOC0
Best Sellers Rank	#1,308 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #14 in Weather Stripping
Brand Name	M-D Building Products
Color	Gray
Customer Reviews	4.6 4.6 out of 5 stars (5,415)
Global Trade Identification Number	00043374714807
Included Components	1 Foam Backer Rod Roll
Item Form	Specialty
Item Highlight	Closed-Cell Foam, Prevents Caulk Waste, Cuts With Scissors, Blocks Drafts Moisture Dust Insects, Indoor/Outdoor
Item Type Name	Backer Rod
Item Weight	9.07 g
Manufacturer	M-D Building Products
Material Type	Foam
Maximum Gap Fill	0.5 inches
Model	71480
Number of Items	1
Number of Packs	1
Part Number	71480
Surface Recommendation	wall
UPC	043374714807
Unit Count	1 Count
Water Resistance Level	Waterproof

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