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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Closed Cell Foam Backer Rod, Gray, 3/4" Diameter x 20' Long, Water-Resistant Joint Filler for Sealant Application, Flexible and Durable for Cracks and Joints

Product ID: 38638699

Details

Brand
SIKA
Item Weight
0.04 Kilograms
Item dimensions L x W x H
240 x 0.75 x
Material
Polyurethane
Style
Joint Filler

💧Water-resistant closed-cell foam

📏3/4" diameter precision fit

🛠️20 ft length for extensive coverage

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C$1691

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Description

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

SEAMLESS AESTHETIC - Neutral gray blends with most surfaces and sealants
DURABLE VERSATILE - Water-resistant foam ideal for interior & exterior use
MAXIMIZE EFFICIENCY - Controls sealant depth to save time and material costs
PERFECT JOINT CONTROL - Prevents 3-point sealant adhesion for flawless flexibility
EFFORTLESS INSTALLATION - Simply insert, seal, and smooth for professional results

Sika’s Closed Cell Backer Rod is a 3/4" diameter, 20-foot long polyurethane foam tool designed to optimize sealant application by filling expansion joints and cracks. Its water-resistant, compressible closed-cell structure prevents sealant adhesion on three sides, ensuring flexibility and durability for both interior and exterior projects. The neutral gray color blends seamlessly with most surfaces, making it a must-have for professional-grade window, door, and glazing installations.

Specifications

ASIN	B013XSV3A6
Best Sellers Rank	#37,000 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #133 in Hardware Sealers
Brand Name	SIKA
Color	Grey
Compatible Material	Foam
Customer Reviews	4.6 4.6 out of 5 stars (1,035)
Global Trade Identification Number	00033886001595
Included Components	Backer Rod
Item Dimensions	240 x 0.75 x 0.75 inches
Item Form	Foam
Item Type Name	Backer Rod
Item Weight	0.04 Kilograms
Manufacturer	Sika
Material Type	Polyurethane
Model	108130
Number of Items	1
Part Number	108130
Style Name	Joint Filler
Surface Recommendation	Window,Door
UPC	033886001595
Unit Count	1.0 Count
Water Resistance Level	Water Resistant

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C$1691

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Nicaragua.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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