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Armacell

Q: Pulled out my rotted 1x4 expansion wood and will have 1-2" void under backer rod when installed. Any requirement to put something like sand under it?

i think sand would work. Maybe backer rod under backer rod ?

Q: Can this rod be easily compressed to fit into narrow spaces?

Yes, it is foam and can be compressed by more than half, it can also be trimmed with scissors if needed.

Q: Can this be used as concrete joint filler?

Yes this works well to fill a gap in concrete, but it should be topped off a good caulk approved for use with cement.

Q: it is stiff enough to force into the void in the garage door bottom seal? I just replaced the seal and was looking for something to help keep shape

I actually have some of this 1" backer rod slipped into the seal on my door to fix a section that separated. But it might be kind of difficult to pull into many feet of seal.

Product ID: 179540496

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Details

Color
Grey
Brand
Armacell
Item Form
Foam
Maximum Gap Fill
1.13 Inches
Surface Recommendation
Floor

💧Waterproof rubber foam

📏1.13" max gap fill

🛠️25 ft continuous length

Frequently Bought Together

Armacell 1" Closed Cell Backer Rod/Crack Filler (25 ft)

M-D Building Products - Versatile Gray Foam Backer Rod Set 1/2in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps, Expansion Joints, and Crack Filling (71480)

Sikaflex Self Leveling Sealant, Gray, polyurethane with an accelerated curing capacity for sealing horizontal expansion joints in concrete, 10.1 fl. oz Cartridge

Description

🛠️ Seal smart, save time — the pro’s secret weapon!

CAULK PROTECTOR - Prevents caulk from ripping loose, extending sealant life
PRO LENGTH ROLL - Generous 25-foot length for multiple projects without interruption
PERFECT GAP FILLER - Seamlessly fills gaps from 3/4" to 1-1/8" for flawless sealing
VERSATILE APPLICATION - Ideal for floors and radon pipe entries, ensuring professional-grade results
DURABLE WATERPROOF FOAM - Rubber-based closed cell foam resists moisture and wear

Armacell’s 1" Closed Cell Backer Rod is a durable, waterproof rubber foam designed to fill large gaps up to 1.13 inches. Sold in a convenient 25-foot roll, it supports caulk application by preventing tearing and ensuring long-lasting seals, perfect for floors and radon pipe installations.

Specifications

Color	Grey
Brand	Armacell
Item Form	Foam
Maximum Gap Fill	1.13 Inches
Surface Recommendation	Floor
Water Resistance Level	Waterproof
Number of Items	1
Manufacturer	armacell
UPC	301635340128
Unit Count	25 Feet
Material	Rubber
Part Number	yyhg-905
Item Weight	4.8 ounces

Have a Question? See What Others Asked

Pulled out my rotted 1x4 expansion wood and will have 1-2" void under backer rod when installed. Any requirement to put something like sand under it?

Can this rod be easily compressed to fit into narrow spaces?

Can this be used as concrete joint filler?

it is stiff enough to force into the void in the garage door bottom seal? I just replaced the seal and was looking for something to help keep shape

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