If the concrete slabs are 1 inch apart, will this work? I could not find any 1" being sold... Should the rope seal be the same width or smaller width?

You want to fit the gap. If the backer rod was too small I put in two rods of different sizes to fill the gap. Took some work to make it fit ok and look ok but once I put in the self leveling chalking it looked good. If there is a gap around the rods the chalk will seep down between. Not good. Could use a different chalk type but I liked the look of the self leveling after it dried.

Will this work between the tub and tile in the bathroom?

Hello. Sika Backer Rod can be used in this application if the sealant installation to follow calls for a closed-cell backer rod. Thank you for considering Sika!

Can this be used to seal between facia boards and brick wall to keep bats out?

We used this to fill big cracks in our driveway and then used concrete sealer over that. I suppose you can use it for your purpose.

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Sika Backer Rod, Gray, Polyethylene Foam a 3/4 inch Closed Cell use to Partially Fill deep Cracks or Joints Before applying sealant, 3/4" Diameter x 20' Long (Pack of 6)

Sika Backer Rod, Gray, Polyethylene Foam a 3/4 inch Closed Cell use to Partially Fill deep Cracks or Joints Before applying sealant, 3/4" Diameter x 20' Long (Pack of 6)

Product ID: 331456375

Details

Material
Other
Brand
SIKA
Style
Joint Filler
Item dimensions L x W x H
6.1 x 0.02 x
Water resistance level
Waterproof

📏3/4" diameter precision fit

🧩20 ft length for versatile joint filling

🛡️Closed-cell foam resists water & solvents

Description

🛠️ Seal smarter, not harder — the pro’s secret to flawless joints!

LIGHTWEIGHT YET DURABLE - 41g weight with robust temperature tolerance for long-term performance
PERFECT SEALANT DEPTH CONTROL - Ensures optimal sealant thickness for lasting durability
FLEXIBLE COMPRESSIBLE DESIGN - Easily adapts to irregular cracks and joints for flawless application
MULTI USE FOR PROFESSIONAL FINISHES - Ideal for glazing, expansion joints, windows, doors, and pavements
SUPERIOR WATER SOLVENT RESISTANCE - Closed-cell polyethylene foam blocks moisture and chemicals

The SIKA Backer Rod is a 3/4" diameter, 20-foot long closed-cell polyethylene foam rod designed to partially fill deep cracks and joints before sealant application. It controls sealant depth, prevents three-sided adhesion, and offers excellent resistance to water, oils, and solvents. Lightweight and flexible, it’s perfect for professional-grade glazing, expansion joints, and perimeter sealing, ensuring durable, moisture-resistant finishes.

Specifications

Manufacturer	Sika USA
Part number	108130
Item Weight	41 g
Product Dimensions	609.6 x 1.91 x 1.91 cm; 41 g
Item model number	108130
Size	20' ft long
Color	Dark Gray
Style	Joint Filler
Material	Other
Item Package Quantity	1
Specific uses	Amateur, Professional
Included components	Backer Rod
Batteries Included?	No
Batteries Required?	No

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Excellent communication throughout the order process. Product is perfect.

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