Cavalok Cavity Closers

Eurocell approached us in to build a kit around their Cavalok cavity closer, a proprietary cavity closing system used to anchor plastic closers into brick walls. What started as a single kit design turned into direct management of Eurocell’s customer accounts and an ongoing product development relationship. Here’s how we identified on-site failure points and helped a national supplier reduce return rates across their product range.

Overview

The challenge

Cavalok is Eurocell’s proprietary cavity closing system, using straps to anchor a plastic cavity closer into a brick wall. Eurocell approached us to see if we could produce kits based on the system, giving installers everything they needed in a single package.

We delivered the initial kit, and Eurocell were happy with it. Shortly after, they handed us off to manage their customers’ accounts directly, rather than routing everything through Eurocell themselves. That put us in direct contact with the people installing the product, which meant we could develop it based on real feedback from the field rather than working at a distance from the end user.

Cava-lok
Overview

How we helped

Working directly with installers surfaced a problem. Several components weren’t performing well on-site, and in some cases were leading to failures that meant refitting doors or windows. This outcome cost the customer money every time it happened.

We investigated a number of options to address the failure points. Alongside product changes, we developed on-site best practice guidance for installers. For example, using an impact drill on an aerated concrete block tends to destroy the block, because the drill wants to spin at maximum rate regardless of the material. Best practice is to instead use a manual socket set or screwdriver, adjustedto the torque the fixing requires. We built guidance like this into best practice boards installers could reference on-site.

construction-workers-install-window-frame-at-const-2026-09-23-18-25-29-utc (Custom)
Overview

The benefits

The customer has since rolled this guidance out across a national product range. Eurocell supplies some of the biggest names in the building industry, and since implementing the best practice procedures, they’ve seen very little return relating to the products and fitting methods covered in the guidance. That’s a direct reduction in the cost, time, and reputational risk that comes with failed installations at scale.

Two factory workers concentrating on assembling PVC window frames on a production line in a modern manufacturing facility

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  • When Jeremy approached us and said he could help with our kitting, it suddenly dawned on me just how inefficient our existing process had become. As our product range rapidly expanded, the time and effort involved in sourcing, designing and assembling kits in-house was becoming a real drain on the business.
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