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HPM September 2017

78 U N D E R F L O O R H E AT I N G Retrofitted underfloor heating a simple fit Heather Oliver, product development manager at Nu-Heat, highlights the best ways to retrofit an underfloor heating system using its quick and simple guide Are you thinking of trying retrofit underfloor heating (UFH) and wondering how you get started? With a range of systems on the market, how do you pick the right one for the job? How long will installation take and do you need training, or can you just get stuck in? You’ll be pleased to know that retrofit UFH is simple to install and that there is a system to suit every type of renovation project. To help you get started, Nu-Heat has put together this quick guide. Getting to know the systems You will notice that the most popular retrofit UFH systems are always fitted on top of an existing floor and are slim to avoid additional height build-up and produce good heat outputs to effectively heat renovation projects. There are two main types of system that you are likely to choose from: 1. Systems that use pre-routed gypsum boards – the lowest profile option As the name suggests, this option is a pre-routed gypsum board that is laid over the existing floor. It offers good heat outputs and as a mostly dry solution, it is also quick to install as there are no drying times. The lowest total height build-up for this system is 15mm and floor coverings can be fitted directly on top. Due to the average heat output of this type of system it is best suited to properties with low to medium heat losses. 2. Systems that use moulded castellated panels with self-levelling compound – for the highest heat outputs Unlike any other UFH system, this retrofit option comes with a specialist self-levelling compound that boosts its heat output. The moulded castellated panels are laid on top of an existing floor, holding the UFH tube in place. Installing a retrofit UFH system that uses pre-routed gypsum boards Once the compound is poured, the system is around 20mm in height and is dry enough to walk on after 24 hours, and ready for floor finishes in 72 hours. The significantly higher heat outputs of this retrofit system make it ideal for properties with higher heat losses, where insulation levels may be difficult to improve or where large amounts of glazing are present. How to install retrofit UFH Whichever system you go for, there are just a few simple steps to follow for a smooth installation. Specific details on how the system is installed will be provided by your UFH supplier in the form of detailed design drawings for the property and illustrated manuals. 1. Always prep the floor When installing retrofit UFH, preparing the floor beforehand is essential. Begin by clearing the floor area, repairing any damage and levelling the floor, if required. If you are working with a suspended timber floor, you should replace or screw down any uneven boards. You may also need to fit isolation and expansion strips around the edges of the room depending on the system chosen. 2. Lay the panels on top of the floor and install the tube Simply lay the pre-routed or moulded castellated panels on top of the existing floor, installing the tube as per the system design drawings. There is no need to glue or screw the pre-routed boards to the floor – unless the panels are over a suspended timber floor where tiles or stone will be fitted. The castellated panel system uses a strong adhesive already applied to the underside to hold them in place, while the self-levelling compound is poured. 3. Commission the system Now that the fixing system and UFH tube is installed, it’s time to fill, flush and pressure test the system to check everything works as expected. If installing the castellated panel retrofit system, you will leave the system under pressure as the specialist selflevelling compound is poured (a contractor may come in to do this depending on the project size). And that’s it – just three simple steps to give you an insight into installing retrofit UFH. For more information, or for help in choosing the right retrofit system for a job, give an experienced supplier a call. It will be happy to advise and can also talk you through how the system is installed and the technical support on offer. If you would like to take a closer look at installation, visit Nu-Heat’s Youtube channel to see its retrofit UFH systems in action at: https://www.youtube.com/user/NuH eatUK. www.hpmmag.com September 2017 enquiry number 146 Installing a retrofit UFH system that uses moulded castellated panels


HPM September 2017
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