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

MAXIMIZE EFFICIENCY - Controls sealant depth to save material and time on every project
PERFECT JOINT CONTROL - Prevents 3-point sealant adhesion for flawless flexibility
EFFORTLESS INSTALLATION - Simply insert, seal, and smooth for professional results
UNIVERSAL COMPATIBILITY - Neutral gray blends seamlessly with most surfaces and sealants
DURABLE WATER RESISTANT - Closed-cell foam resists moisture for long-lasting performance

Sika Closed Cell Backer Rod is a 3/4-inch diameter, 20-foot long polyurethane foam joint filler designed to enhance sealant performance by controlling depth and preventing adhesion on three sides. Its water-resistant, compressible closed-cell structure ensures durability and flexibility for interior and exterior applications, making it ideal for expansion joints, window, and door perimeters. Easy to install and compatible with most sealants, it delivers professional-grade results while saving time and material.

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Material	Polyurethane
Brand	SIKA
Style	Joint Filler
Item dimensions L x W x H	6.1 x 0.02 x 0.02 Meters
Water Resistance Level	Water Resistant
Item Form	Foam
UPC	033886001595
Net Quantity	1.0 count
Global Trade Identification Number	00033886001595
Number of Items	1
Colour	Grey
Surface Recommendation	Window,Door
Manufacturer	Sika
Country of Origin	USA
Item model number	108130
Product Dimensions	609.6 x 1.91 x 1.91 cm; 41 g
ASIN	B013XSV3A6

Sika Closed Cell Backer Rod (3/4-inch)

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