Installing underfloor heating can be one of the best decisions you make for your home – providing energy-efficient warmth and a touch of luxury. But whether you're a seasoned installer or a first-time DIYer, some common pitfalls can turn a dream project into a costly headache.
Here are five common mistakes to avoid when installing underfloor heating – and how to do it right the first time.
1. Skipping the Insulation Layer.
The Mistake: Many people overlook or skimp on the insulation layer beneath the heating system. Without proper insulation, much of your heat is lost downwards instead of rising into the room.
Why It Matters: Insulation ensures your system heats efficiently, saves energy, and reaches desired temperatures faster.
How to Avoid It: Always use high-quality insulation boards that are compatible with your floor type. This step pays off in terms of both performance and running costs.
2. Poor Layout Planning.
The Mistake: Laying heating mats or pipes without proper spacing, or installing them under permanent fixtures like cabinets or bathtubs.
Why It Matters: Bad layout planning can result in uneven heating, cold spots, and even system damage.
How to Avoid It: Create a clear floor plan before installation. Avoid placing heating under heavy or immovable furniture. Leave a margin around walls and follow the manufacturer's spacing guidelines.
3. Incorrect Floor Sensor Placement.
The Mistake: Installing the thermostat sensor in the wrong location – either too close to a heat source, too deep in the floor, or loose in the conduit.
Why It Matters: Poor sensor placement leads to inaccurate temperature readings and inefficient heating.
How to Avoid It: Place the sensor evenly between heating elements, at least 30cm into the heated area. Ensure it’s fixed securely in a conduit for future access.
4. Not Testing Before Covering (Electric ufh).
The Mistake: Laying flooring over the system without testing it first.
Why It Matters: If there’s a fault and the system is already covered, diagnosing and repairing it becomes more difficult and expensive.
How to Avoid It: Always perform a resistance test and insulation test before and after installing the heating system. Most systems should include test instructions – don’t skip!
5. Ignoring Manufacturer Instructions.
The Mistake: Skimming or ignoring the installation manual, especially when you’re in a rush or think you’ve “done it before.”
Why It Matters: Each system is different. Overlooking specific requirements can void warranties or lead to performance issues.
How to Avoid It: Read the manual thoroughly. Pay attention to drying times, adhesive types, and floor covering recommendations. It’s the quickest way to avoid expensive mistakes.
Installing underfloor heating is a smart investment in comfort and energy efficiency, but only if it's done right. By avoiding these common mistakes, you'll ensure your system performs optimally and stands the test of time.
At Underfloor Store, we provide more than great products; we offer excellent advice.
Contact our team for personalised advice or explore our range of underfloor heating kits to get started today.
Pre-Insulated Pipe
