What Can Go Wrong with Wood Floors Over Underfloor Heating
Wood flooring and underfloor heating should be a match that is made in interior design heaven. Warm floors, no radiators jostling the walls, that beautiful feel of bare feet in winter. However, when the mix-up is made, it becomes a slow-motion catastrophe. Boards cup. Gaps open up between planks. The floor swells up at the corners like an off-puttish mood personified. Decades of experience by Wood Floor Fitters London professionals who have witnessed all variants of what occurs when the incorrect product is installed in the incorrect system have shown that it is never inexpensive to repair. Discover how easy it is to transform your home by choosing reliable engineered wood flooring fitters near me for a flawless finish.
Best Flooring Fitters London has over 20 years of experience fitting floors in South London – Herne Hill to Elephant and Castle, Streatham to Stockwell. In our consultations, the issue of UFH compatibility is raised about every half. Now we shall proceed to what really counts, what the fallacies are, and why a proper fitter is perhaps more a matter of choice than a proper floor.
The Complicated Relationship of Wood and Heat
Wood moves. It is no flaw in it–it is the character of the stuff. Wood swells with increase in temperature. Wood shrinks as humidity decreases (as heating is turned on). This motion is much to be expected and controlled in a room where there is no underfloor heating. The thermal cycling is more severe and common over a UFH system.
Solid does not cope with this. Board of solid oak, 20 mm thick, is very massive and will stretch and shrink, and it will do that, too, sometimes you can see it, and sometimes you can hear it. The cumulative stress with time results in cupping, splitting or boards that just do not want to be flat.
Engineered wood is a completely different construction. The core – usually composed of cross-directional layers of plywood or HDF – prevents the lateral movement that causes solid timber to move. A well-specified UFH system will be much more consistent, year after year without the drama, when it is operated by a quality engineered board.
With that said, engineered wood is not necessarily fine with any UFH arrangement. The quality of construction is of the essence. A fine layer of wear on a low-cost core is not comparable to an engineered board with a stable multiply structure of a proper grade. The difference manifests itself – sometimes even in the first winter.
The Temperature Rules That Fitters Should Use
There are limits that are hard and are independent of what the flooring manufacturers may claim in their brochures. A floor with a UFH system should not be allowed to reach a temperature above 27 degree Celcius. That is the limit beyond which practically any wood product begins to undergo accelerated stress.
This then practically implies that the UFH system should be commissioned well in advance of flooring being laid. Installation should be done after a gradual increase to the temperature of the floor, which is usually done over a period of several days. The same gradual process of warming up follows after fit. Leap directly to full temperature and you’re begging to be caught.
This was confirmed to a client in Brixton a few years ago. Beautiful hard oak; fine article, good job, right setting-up–but the heating man had turned the system to full blast as soon as the floor was laid down. In three weeks a long hole had been worn in the middle of the room.
Any wood floor fitters London firm worth hiring must first enquire: What kind of UFH system do you have, and is it tested? Unless they inquire, that is information concerning their level of care.
Have underfloor heating and want to get the flooring right first time? Contact Best Flooring Fitters London at 020 3322 7001 to have a free consultation. We evaluate each UFH case and then prescribe one product – no guessing, no shortcuts. No guessing, no shortcuts.
Wet System vs Electric: What is the Difference?
UFH comes in two main forms — wet (hydronic) systems using water pipes, and electric systems using heating cables or mats. They act differently with wood flooring and the difference influences what you can fit. They act differently with wood flooring and the difference influences what you can fit.
Wet systems are generally operated at lower surface temperatures and warm up at a slower rate. They tend to be more uniform, and this is fitting of wood flooring. They tend to be more uniform, and this is fitting of wood flooring.
Electric systems can warm more quickly and generate more localised temperature change – especially where mat-style installations are in place, which might not be evenly covered. Generate more localised temperature change – especially where mat-style installations are in place.
Electric systems also vary in the height of build-up of the floor depending on the type of installation and it will influence what thresholds and door clearances have to be adjusted. This is easily forgotten during the first spec and is an issue during fitting day.
In open plan renovations, properties in Brixton are increasingly incorporating electric UFH in the bathrooms and wet systems in other areas. It is an experience issue to know how the two interrelate, and how to spec flooring in both areas on a regular basis.
Moisture Barriers and Subfloor Prep Over UFH
The subfloors of concrete, which are prevalent in new construction and ground floor extensions in South London, contain residual moisture that can cause havoc to wood flooring despite the installation of UFH pipe system in them. Before any wood is laid down the concrete must be completely cured, that is, at least 60 days.
A moisture resistant membrane is typically necessary even at that time. The particular type is based on the flooring product and moisture reading of the subfloor. Get that incorrect and the floor will be lifted upwards instead of the surface.
When you are looking to find engineered wood flooring fitters in my area and UFH compatibility is included in your project, be sure to ask: How do you test subfloor moisture and what membrane do you use? One who does this regularly is a fitter who has a clear, confident answer.
Species and Thickness: Not Every Engineered Wood is the same
Oak is the preferred engineered wood, compared to UFH, and rightly so; it is dimensionally stable, is generally available in UFH-rated specifications and most London interior fashions. But oak is so different in grade, cut, and construction.
Rift and quarter-sawn boards are cut at a right angle to the growth rings which makes them more stable than plain-sawn equivalents. This is important in the case of UFH applications. The added stability minimizes the danger of seasonal movement.
Another aspect that people do not pay attention to is wear layer thickness. Once, possibly twice, a 3mm wear layer can be sanded and refinished. A 6 mm wear layer provides much longer life – significant in a family home in Brixton.
Laminate Over UFH: Not as Good as You Think
Something that most homeowners do not think about, and should is premium laminate flooring over UFH. Quality laminate is dimensionally stable, can withstand changes in temperature and is a lot cheaper than engineered wood. It is worth considering in investment properties and tight-budget projects.
The most important specifications to consider are a UFH compatibility rating of the manufacturer and a thermal resistance (Tog) of less than 0.15. Beyond that level, the floor becomes an insulator to the heat instead of letting it penetrate.
Best Flooring Fitters London provides and installs laminate flooring installation products that are completely UFH rated in all the neighbourhoods in South London. We do not suggest anything that we would not have in our own homes.
The Process of Fitting Itself: Mistakes Are Here
Even the correct product may fail when the fitting process is not done properly or in a rush. The step that has been most frequently skipped is that of acclimatisation. Manufactured boards require time in the room before installation takes place.
Wall and threshold expansion gaps cannot be compromised over UFH. The floor must be allowed to breathe. Jump over the gap, reattach the skirting, and see the floor rise up in a slow-motion wave.
The type of adhesive is important, as well. Installations over UFH can be floated, but are not always optimal – over time, the action between boards can cause noise. Flexible and heat-stable compound adhesive is frequently the preferable path.
People Also Ask
Is it possible to have laminate flooring with underfloor heating in homes in Brixton?
Yes–and in most instances it is a really intelligent decision. Laminate used today in UFH applications has a thermal resistance rating (in Tog) that enables heat to pass through it effectively. Quality laminate works well on wet systems as well as electric systems.
Properly specified laminate can often be the solution to London homeowners in Brixton and others who desire the warmth of UFH but cannot afford the high price of engineered wood. It has been fitted by Best Flooring Fitters London on dozens of UFH projects throughout South London.
Get it right the first time. Book your free UFH flooring consultation with Best Flooring Fitters London by calling 020 3322 7001 now or by going to https://flooringfitterslondon.org.uk/.