Kool-Rod 7/8″ Backer Foam For Deck-O-Seal – 1 Ft Length (4650875)

Description

Kool-Rod 4650875 is a 7/8-inch closed-cell polyethylene foam backer rod manufactured by W. R. Meadows, specifically designed for use with Deck-O-Seal and other cold-applied pool deck joint sealants. Sold per lineal foot, it installs quickly into pool coping-to-deck expansion joints and cantilever decking joints to control sealant depth, establish the correct 2:1 width-to-depth joint ratio, and prevent sealant from over-filling or sinking into the joint cavity. The 7/8-inch diameter is well suited for slightly narrower expansion joints where a full 1-inch rod would be too wide to compress properly into place. The closed-cell foam structure is virtually non-absorbent and chemically inert to most solvents, ensuring it will not absorb moisture, trap air, or bond to the sealant applied above it — eliminating the risk of three-sided adhesion failure that compromises long-term joint performance. Fully compatible with acrylic, butyl, polyurethane, polysulfide, silicone, and most other cold-applied sealant compounds, Kool-Rod can be cut to length or compressed into place with a blunt instrument or roller with no special tools required.

Highlights

• 7/8″ Diameter for Narrower Expansion Joints: The 7/8-inch diameter is ideally sized for slightly narrower pool deck and coping expansion joints where a 1-inch rod would over-compress or resist proper seating — always select a rod diameter slightly larger than the joint width for a secure, tight fit.
• Controls Sealant Depth for Proper Joint Design: Installed below the sealant layer, Kool-Rod establishes the correct 2:1 width-to-depth joint ratio recommended for Deck-O-Seal and all cold-applied pool deck sealants — ensuring a properly configured joint that performs and seals as intended over the long term.
• Closed-Cell Foam — Non-Absorbent & Air-Tight: The closed-cell polyethylene structure is virtually non-absorbent and prevents air or moisture from becoming trapped between the backer rod and the sealant above, eliminating a common cause of joint seal failure in pool deck and coping applications.
• Non-Bonding to Sealant — Eliminates Three-Sided Adhesion Failure: Kool-Rod will not adhere to any cold-applied sealant compound, ensuring the sealant bonds only to the two joint faces rather than the backer rod below — the correct two-sided adhesion configuration that allows the joint to flex and move without cracking or delaminating.
• Compatible with All Major Cold-Applied Sealants: Fully compatible with acrylic, butyl, polyurethane, polysulfide, silicone, and most other cold-applied sealant compounds — including the full Deck-O-Seal product line — making it a universally reliable backer rod for pool deck, coping, and expansion joint applications.

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