🛠️ Seal smarter, save bigger—your gap-filling game changer!
The M-D Building Products Versatile Gray Foam Backer Rod is a 1/2 inch thick, 250-foot long weather-resistant foam designed to fill and seal medium gaps in concrete, doors, windows, and expansion joints. It enhances caulking durability, reduces material waste, and improves insulation for both indoor and outdoor applications.
| Brand | M-D Building Products |
| Color | Gray |
| Item Form | Foam |
| Item Weight | 0.01 Ounces |
| Maximum Gap Fill | 0.5 Inches |
| Surface Recommendation | Concrete, Door, Walls, Window |
N**D
makes great insulation
closed in a screened deck and made a glassed in sunroom. Used backer rod to fill in the gaps between deck boards. I'm relatively sure the rod doesn't have a large R value, but it stopped the wind from blowing through the floor. It did make it possible to heat the room with a mini-split (which is not overloaded). It has kept the sunroom quite comfortable during winter (temps down to 8F). If it works as well in the summer heat, I'll give it high marks as an insulator.
L**A
Great as always
A must-have for any caulking or sealing job. Reduces the amount of product you need to waste by filling in the empty holes.
A**N
No more drafts
We used it in more areas than we thought we would. Perfect for all the little insulation projects!
Trustpilot
3 weeks ago
2 weeks ago
