Faster Installation
With most projects are completed in just a day.
Energy-Efficient Heating
Using lower temperatures than radiators, reducing energy costs.
Zero Floor Build-Up
Ensuring no need to raise floors or remove existing screeds.
Heating Needs Met
So no additional heating is needed.
Alternative for Concrete Floors
For concrete floors, we install a bonded polymer screed with a minimum thickness of 20mm. After the screed is applied, the floor will be milled to prepare for heating installation.
Our Process for Screeded Floors
Identifying Floor Type:
The first step is determining whether the floor is screed (Anhydrite, Sand & Cement, or Cementitious Flowing Screed) or concrete. We will also explain the strength differences between screeds and concrete, typically measured in N/mm. If necessary, we will perform a test milling, which is chargeable but refundable if the floor is deemed suitable for milling and the project proceeds.
Pre-Start Site Visit:
A site visit is conducted to confirm manifold locations, review floor services, discuss control systems, and establish the installation timeline.
Zone Drawings and Schematics:
We provide detailed zone drawings showing the thermostatic control zones and the potential routing from the manifold. Electrical first-fix schematics are also provided. If needed, we offer schematic drawings for plumbing integration.
Installation Requirements:
For installation, we require vehicular access within 10 meters of the building or milling area, adequate site lighting (if necessary), access to clean potable water, and a clear work area. The floor must be flat, free from holes, pits, and any obstructions such as plaster or tile adhesive. During the pre-installation visit, we will assess the floor and advise on any necessary adjustments.
Logistics for Installation:
Our milling machines operate on 415V/3-phase power and require a specialized 3-phase generator within our vehicles (hence the 10-meter proximity). Ground-level access is required; if the milling area is not on the ground floor, mechanical assistance (e.g., ramp or hoist) will be needed to move the equipment.
Our Installation Process
1. Marking Out
The client or project supervisor assists in marking fixed furniture locations (e.g., kitchen units, sanitary ware) using line-marking spray. Pipes are installed 100-150mm from these fixed areas.
2. Manifold Installation
Once the manifold location is confirmed, it will be securely mounted. Typically, the manifold is installed 1 meter from finished floor level (FFL), with the top at approximately 700mm. We can adjust the placement as needed for specific site conditions.
3. Milling
Retro Therma engineers will mark the installation circuits or loops and their corresponding tails to the manifold using line spray. Our dust-free milling process employs advanced dust extraction systems with HEPA filters. Note that milling can be noisy, and we recommend vacating the premises for the duration. Our machines create precise 16-17mm wide and 20mm deep channels, using a reverse return or bifilar pattern for even heat distribution.
4. Pipe Installation
We use 16mm multilayer PERT pipes with an oxygen barrier for optimal heat delivery and a 75-100 year warranty. Each loop has a maximum length of 85m, with 75m being our preferred length. Shorter loops are used in smaller rooms (under 8.5m²). No couplings or joints are used during initial installation, though repairs can be made if needed.
5. System Testing
Once installation is complete, the system is filled with potable water, and air is purged from each loop. The manifold is pressure-tested according to manufacturer or building regulations.
6. Controls Installation
Thermostatic controls are provided to the site electrician, along with the necessary schematics and installation instructions. Each manifold loop is clearly labelled to indicate the areas it serves.
7. Commissioning
After installation and testing of the controls, Retro Therma’s commissioning engineer will adjust the system. This includes calibrating thermostats, setting temperature and time parameters, and adjusting flow rates for each manifold. Heat is gradually introduced, typically starting at 25°C and increasing by 2.5–5°C per day until reaching the desired flow temperature of approximately 45°C. This gradual process ensures the longevity and optimal performance of the floor.
