Routing Flexigas in joisted floors
Notch and drill rules, metal-web and engineered joists, and keeping other trades off the run.
Technical guides
Real answers, from the people who built the system.
Practical guides for installers, specifiers and merchants. How to install it, how to size it, what the standards mean, and when to use what. No marketing, just the detail.
Start here
The complete install guide.
Installation guide
Installing Flexigas CSST: the complete guide
If you install copper, you already know most of it. The 18-minute reference: cuts, terminations, routing in joists, floors and walls, sleeves, bonding, testing and sizing. Every claim sourced from the Installation Manual.
18 min read ยท Gas Safe registered engineers
Installation guides
How to install it.
Pressure testing a Flexigas installation
Gas tightness testing to IGE/UP/1B, leak detection fluid, and why you tape after the test.
Connecting Flexigas to copper, iron and brass
Approved BSP transitions, switching mid-run, and the rule on flux and other CSST brands.
Standards & compliance
What the standards mean.
EN 15266 explained for UK gas installers
The CSST manufacturing standard in plain English, and what it means on a real install.
BSI Kitemark KM 598726
What the Kitemark covers, why mixing CSST brands voids it, and what to show building control.
Earth bonding with FG Bond
Bonding to BS 7671, where the clamp can and cannot go, and how FG Bond makes it faster.
Product selection
When to use what.
Flexigas vs copper for gas pipework
When each makes sense on speed, cost, routing and testing. An honest comparison.
How to size Flexigas for a domestic install
Pressure loss, equivalent lengths and the worked example, plus when to reach for the calculator.
Troubleshooting
Get it right first time.
Common Flexigas install mistakes
The handful of issues that cause a fail re-test, and how to avoid every one.
Cannot find it?
Got a question a guide does not answer?
Talk to the Flexigas technical team. If it is a good question, it probably becomes the next guide.