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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Backer Rod, Gray, Polyethylene Foam, Closed Cell Used to Partially Fill deep Cracks or Joints Before applying sealant, 3/4" Diameter x 20' Long

Product ID: 331456375

Details

Brand
SIKA
Item dimensions L x W x H
6.1 x 0.02 x
Item weight
0.04 Kilograms
Material
Other
Style
Joint Filler

📏3/4" diameter precision fit

🧩20 ft length for versatile joint filling

🛡️Closed-cell foam resists water & solvents

€ 99.74

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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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

ASIN	B013XSV3A6
ASIN	B013XSV3A6
Brand Name	SIKA
Color	Dark Gray
Compatible Material	Foam
Customer Reviews	4.6 4.6 out of 5 stars (1,014)
Customer reviews	4.6 4.6 out of 5 stars (1,014)
Date First Available	14 September 2015
Global Trade Identification Number	00033886001595
Included Components	Backer Rod
Is Discontinued By Manufacturer	No
Item Dimensions	6.1 x 0.02 x 0.02 Meters
Item Form	Foam
Item Type Name	Backer Rod
Item Weight	0.04 Kilograms
Item model number	108130
Manufacturer	Sika USA
Manufacturer	Sika USA
Material Type	Other
Model	108130
Number of Items	1
Number of Packs	1
Part Number	108130
Product Dimensions	609.6 x 1.91 x 1.91 cm; 41 g
Style Name	Joint Filler
Surface Recommendation	Window,Door
UPC	033886001595
Unit Count	1 Count
Water Resistance Level	Waterproof

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