FAQs

If you have a specific set of U-values and thermal performances to meet, especially when it comes to ground floor slab insulation, this is a query best left to an architect or structural engineer. They will be equipped to take into account all necessary elements of the building fabric, to reach a solution that meets the criteria for the relevant Building Regs.
For the purposes of laying our pipework, we have fixing systems to suit all thicknesses of insulation. For plastic clipping systems, the minimum is 25mm. If less is used, or none at all, we can offer our Castellated Plate system.

Our standard control systems can be controlled via BMS using an enable signal only. The BMS will not be able to read, write or monitor room temperatures, and our controls cannot provide a fault signal.

Our INTELIQ™ smart control systems has to the potential to fully communicate with a MODBUS-compatible BMS.

Underfloor heating will function optimally at a flow temperature between 45˚C and 55˚C.

If the system is being served directly from a boiler at around 80˚C, we will provide our manifolds with a 3-port valve and pump arrangement, to mix the water down to a more suitable temperature.

The minimum flow temperature with underfloor cooling systems is 14˚C, in order to avoid any risk of condensation forming within the slab.

We do not have an in-house screeding division, but we are prepared to sub-contract a screed installer as part of our package.

The manifold controls and pump (if present) will require a 230v 5A supply from a fused isolator.

Warmafloor has a number of systems to suit different applications of batten and sprung floors. These can be split into four categories:

  1. Systems for use over heated screeds
  2. Systems for fitting over concrete or timber floors
  3. Systems for fitting over engineered timber floors
  4. Systems for fitting over concrete floors with adjustable height battens

Warmafloor systems can be incorporated within load bearing structural floors, in a variety of applications, from factories and warehouses to sports complexes. There are generally two types of floor construction, those of a simple concrete slab construction and those which incorporate a reinforcing wire mesh grid at mid level in the floor. Warmafloor surface heating and cooling systems cater for both construction types.

Heated screed or concrete floors will expand and contract slightly during use; the edge insulation is normally sufficient to take up this movement. However, in certain situations and especially with floor finishes such as tile, marble or stone, screed expansion joints will be required. Whilst the Warmafloor pipe characteristics enable it to be stretched by 50% plus without damage, the pipework circuits crossing them should be kept to a minimum and where pipes do cross the joints, they should be sleeved for safety. We will take expansion and movement joints into account when advising on the most efficient pipe design.

For optimum performance, and avoidance of potential future cracking or weakness, we would recommend a minimum of 65mm if a sand-cement screed is used, or 55mm if a liquid screed is used.

However, screed manufacturers may be happy to guarantee their products at lower levels. Please contact your preferred screed contractor for clarification.

In the Castellated Plate system, vacuum formed sheets of recycled plastic which incorporate pipe-locating castles are laid over the sub floor (thermally insulated in accordance with Building Regulations) overlapping the edges by 75mm and interlocking them to form a continuous layer, with edge insulation to all walls. Warmafloor 16mm PB pipework is clipped into the panels then covered with the appropriate screed and final floor finish.

Warmafloor Castellated Plate system can be fitted to a concrete floor construction thermally insulated in accordance with Building Regulations which has a screed topping. System plates are useful where there is a restricted floor depth.

In the Clip Rail system, the floor is fitted with suitable floor insulation, overlaid with a vapour barrier, with edge insulation to all walls. A plastic pipe-locating rails is secured into the floor insulation with fixing pins. The Warmafloor PB pipework in 16mm or 20mm is clipped into the rails and then covered with the appropriate screed and final floor finish.

Warmafloor systems can be fitted to any type of concrete floor construction which has a screed topping.

In the Wire Grid system, the floor is fitted with suitable floor insulation, overlaid with a vapour barrier, with edge insulation to all walls. An A142 wire grid, which has a 200mm square mesh pattern, is laid butt jointed onto the floor insulation. Warmafloor PB pipework is then laid out on the grid in the required configuration and secured to the grid with plastic securing ties and are then covered with the appropriate sand/cement or concrete screed and final floor finish.

Warmafloor systems can be fitted to any type of concrete floor construction which has a screed topping. The Warmafloor Wire Grid system is suitable for sand/cement or concrete screed coverings but is not suitable for liquid screed applications.

Warmafloor Tacker floor insulation panels are available in any thickness and various insulation materials, providing solutions for any floor requirement.
The floor insulation panels, whilst generally supplied in expanded polystyrene EPS, are also available in polyisocyanurate (PIR) (eg Celotex) or in extruded polystyrene, providing extra strength or greater “U” values.

In the Tacker system, floor insulation, edge insulation, moisture barrier, fixing system and pipework are installed utilising Tacker clips, then covered with the appropriate screed and final floor finish.

Warmafloor systems can be fitted to any type of concrete floor construction which has a screed topping.

The U-value of a material measures how effective a material is as an insulator. The lower the U-Value, the better a material is as an insulator. According to the building regulations the U-Value for floors should be no greater than 0.25 W/m²K. We will advise on the type and thickness of insulation required to bring the floor U-Value under 0.25 W/m²K. Read more on U-Value calculation

Floor surface temperatures should not exceed certain levels – otherwise discomfort and damage to the floor can occur. The maximum recommended temperatures are: occupied areas, 29°C; peripheral areas, 35°C; bathrooms, 33°C. When wooden or vinyl floor coverings are used, manufacturers instructions on maximum floor surface temperature should be followed. The floor surface temperature will vary according to the heat output requirements of the room or building.

Surface heating and cooling systems can be powered by any boiler or energy source and work very effectively with biomass boilers; solar thermal panels; air-to-water heat pumps and ground source heat pumps.

Surface heating enjoys a 40% shorter installation period and generates 1-2 weeks’ preliminary savings than conventional methods. Warmafloor also uses its own fully trained workforce, rather than using subcontractors, to ensure that projects are completed on time and on budget.

Surface heating is a reliable whole-life system that requires no maintenance. It lasts the entire lifetime of a building, unlike radiators that need replacing at least twice. There is no need for manual operations, such as bleeding or painting. Our pipes are guaranteed for 100 years; ten times longer than steel and copper radiator pipes which require routine repairs due to joints which leak, attract scale and decay.

A few years ago, the application of surface heating to any building involved a premium in additional capital cost. This was not so much for the system itself, but rather for the insulation layer required to prevent downward heat loss. Now Part L regulations demand insulation in the floor whether you heat it or not. In fact, most of the projects we get involved in have layers of insulation with a thermal performance far in excess of that required for the heating system.

Today, the cost of the insulation material and the time taken to install it are no longer part of the surface heating package, so the best solution is now often the least expensive too. Surface heating and cooling systems offer cost savings as they operate at lower air temperature (1-2˚C lower to provide same level of comfort). Cyril Sweett and The Trade Association for Surface Heating and Cooling (UHMA) research reveals that a traditional radiator system costs 25% more over a 30 year period that a surface heating system. There is also a reduction in building heat losses and energy consumption and the heat source can operate at its highest efficiency. The greatest savings will be in rooms or spaces with high ceilings, as our systems heat only the occupied zone.

Savings in the region of 30-50% are possible. In rooms with lower ceiling heights, the savings will come from the lower operating temperatures of the system, together with the reduced air temperatures, to give savings of 10-20%. There are also no costs attributable to painting and decorating and no replacements due to vandalism of radiators etc. We find that this is often a key criteria for specifiers.

Thanks to close and accurate controls, the response is rapid and accurate. At Warmafloor we have long invested in quick and comprehensive controls. Our total integrated control strategy is intuitive and uses Proportional-Integral-Derivative logic (PID) to optimise energy distribution and ensure a consistent temperature. It ensures a rapid response time and is accurate to within 0.5˚C as opposed to the 4˚C band of thermostats to ensure lowest running costs.

Yes. Our surface heating and cooling systems are compatible with virtually all types of floor covering. The best floor coverings for use with surface heating are hard surfaces as they have the least resistance and transfer heat effectively. Vinyl floor covering have a recommended maximum floor surface or sub floor temperature that they can operate at; if a higher temperature is used it can damage the floor covering. Manufacturers’ data sheets should be checked to confirm the covering’s suitability. Suitable adhesive should be used as per manufacturers’ recommandations. See flooring section

Yes. Our surface heating and cooling systems are compatible with virtually all types of floor covering. Recent research has shown that due to the open weave of most carpets they do not restrict the flow of heat from underfloor heating systems to any great degree. However carpet underlay and foam backed carpets do. Carpets and underlays have thermal resistance characteristics that will reduce the heat output when fitted over an underfloor heating system. To counter act this resistance, the system design can be adapted to foctor int the extra heat output needed. Some floor covering manufacturers stipulate a maximum floor temperature for their product which also need to be taken into account. See flooring section

Yes. Our surface heating and cooling systems are compatible with virtually all types of floor covering. The best floor coverings for use with surface heating are hard surfaces as they have the least resistance and transfer heat effectively. Laminate, engineered wood and timber floor coverings can be fitted with underfloor heating. The system design must factor in the manufacturers’ guidelines as often a maximum floor temperature is stipulated for wooden floor coverings. It is also important to follow manufacturers’ guidance on moisture content during fitting. See flooring section