a subfloor system and an underfloor heating system...

11 | 2008

A subfloor system and an underfloor heating system – together a complete solution for projects

involving construction, structural alterations and renovation work

2 Granab Subfloor System and Uponor Underfloor Heating System

Granab Subfloor SystemThe best features are always out of sight

The subfloor system

Granab manufactures subfloor systems for residential properties, offices, schools and public buildings. Steel floor joists with damping elements for effective impact sound and airborne sound insu-lation. The Granab Subfloor System is patented and type-approved with regard to its sound-damping properties, dynamic loads, strength and resilience. More than two million square metres of the Granab Subfloor System have been installed as part of various projects.

The underfloor heating system

Uponor manufactures underfloor hea-ting systems for all types of building. Underfloor heating systems are supp-lied complete with room regulation for an optimum indoor climate. Since 1972, Uponor has manufactured over 1,500,000,000 metres of PEX piping. Much of that has been supplied for under-floor heating systems installed all over the world. Uponor Underfloor Heating Sys-tems feature jointless installation, which ensures a more reliable system.

The combination

The two systems have been developed to work effortlessly together. This combina-tion guarantees you an optimum sub-floor system with safe and comfortable underfloor heating. Efficient installation reduces the build time and helps to keep the overall cost down.

Our system enables you to walk barefoot on a warm bathroom floor

The system does not restrict the architecture or furnishing

You can choose a surface finish that adds to both the function and design

Granab Subfloor System and Uponor Underfloor Heating System 3

Benefits of a subfloor system

• Effective impact sound damping and airborne sound insulation

• Dry installation method. Can be instal-led directly on untreated concrete floors without the need for wet screeding

• The system has an environmental friendly product declaration

• Consists entirely of inorganic material and is not affected by moisture or temperature fluctuations

• Makes floors more comfortable for a better living and working environ-ment and ensures a creak-free floor

• Type-approved

Benefits of an underfloor heating system

• Underfloor heating systems are covered by a building product declaration

• The underfloor heating pipes (Wirsbo-pePEX pipes) are made of polyethylene and are converted to water on combustion

• Unlimited choice of heat source

• Smaller electrical installations for wireless room regulation

• No impact on the position of win-dows and other architectural features

• No impact on furnishing

Common properties

• Comfortable environmentally friendly floors

• Flexible pipe-laying and electrical wiring that is separate from the buil-ding design

• Designed and tested as a total concept

• Faster, more flexible and simpler construction method

• Unlimited choice of flooring/surface

• Easy to work with in the event of future structural alterations or reno-vation work

• Contributes to a healthy home and environmentally-friendly residential pro-perties, schools and public buildings

• A well-thought out and efficient construction process.

Uponor Underfloor Heating SystemsNothing warms as well as genuine underfloor heating

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The best of both worldsA complete subfloor and underfloor heating system


The best of both worldsA complete subfloor and underfloor heating system

Cellular floor

Granab Subfloor System

Uponor UFH Chip board

Uponor Heat emission plates

Uponor Underfloor heating pipes

Plastic film

Parquet flooring

To date, Granab’s patented and type-approved floor joists systems have been installed in more than two mil-lion square metres of floor in residen-tial properties, offices, schools, shops and public buildings.

The Granab Subfloor System is type-approved. It has been tested and certified by the Swedish National Testing and Research Institute (SP) with regard to its sound-damping properties, dynamic loads, strength and resilience. The stable galvanised steel joists are extremely strong and are not affected by moisture or temp-erature fluctuations. Other incorporated components are made of moisture-resis-tant materials. The subfloor system’s in-built impact-damping properties ensure comfortable and silent floors.

A lot of people are looking to reduce their electricity consumption for heating and are switching instead to district hea-ting or another energy source. Uponor Underfloor Heating Systems can be connected to all types of heat source. It is not uncommon for houses under construction or being renovated to be fitted with underfloor heating.

By letting the warmth rise from the floor, heat is distributed evenly throug-hout the room. Optimum comfort is achieved using a room thermostat and individual regulation of all rooms. With warm floors, the room temperature can be reduced a few degrees. This benefits both your wallet and your wellbeing, as the feet are the body’s own thermostat.

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Decorate any way you wantOpen up to creative architecture

Being able to choose whichever surface finish you want encourages creative architecture

The combination of a Granab Sub-floor System and Uponor Underfloor Heating System does not simply mean being able to climb out of bed in the morning without the soles of your feet encountering a freezing cold floor.

A silent, warm and comfortable floor also encourages greater freedom when it comes to decorating and furnishing your home.

Underfloor heating allows you to use every square metre of floor surface. And think how easy it will be to paint and wallpaper the walls. No radiators or pipes that collect dust to ruin your decorating dreams. If you want to move the sofa or your favourite armchair under the window, then why not? This form of heating works well no matter how the furniture is arranged.

Quick and easy installationThe customer, installation engineer and builder

all benefit financially


Quick and easy installationThe customer, installation engineer and builder

all benefit financiallyComplete documentation

Both the Granab Subfloor System and Uponor Underfloor Heating System are well documented. You can down-load product information and instal-lation instructions from our websites, www.granab.se and www.uponor.se.

Two laying options Uponor Underfloor Heating Systems can be combined with the Granab Subfloor System using two different laying methods. You can choose between laying Uponor UFH Chip boards, grooved 17, over the floor joists and using Uponor UFH Cassette 20 with insulation between the floor joists, system 7000.

Uponor UFH Chip board, grooved 17

Grooved UFH Chip board is glued and screwed securely to the joists. Heat emission plates to distribute the heat are laid in the grooves and then underfloor heating pipes are inserted into the plates. Flooring may comprise, for example, 15 mm parquet flooring, which is instal-led on top of plastic film. Follow the floor manufacturer’s instructions carefully.

Uponor UFH Cassette 20 with insulation

Underfloor heating installed in an Uponor UFH Cassette 20 with insulation that is laid along the floor joists. The cassettes rest on Uponor Cassett support. The standard distance between joists is c/c 600 mm. The flooring may be, for example, 22 mm. Follow the floor manufacturer’s instructions carefully.

Uponor UFH Cassette 20 withinsulation

Plastic matting may also be laid over the underfloor heating. First lay flooring chipboard across the floor joists and then lay the plastic matting over that. Another alternative may be to apply floor plaster over the particle board and then lay tiles in the plaster. Follow the floor manufacturer’s instructions carefully.


Uponor UFH Chip board, grooved 17 Procedure for installation

First the surfaces where the underfloor heating and subfloor systems are to be installed must be cleaned and made accessible.

The manifold cabinet should be positio-ned as shown in the drawing.

Install the feed lines from the heat source to the underfloor heating manifold. The supply line is fitted to the upper mani-fold and the return line to the lower one. Each manifold is equipped with an balancing valve.

The feed lines must be secured suf-ficiently.

Any excess adhesive should be wiped away, with particular attention being paid to grooves where underfloor heating plates or pipes will be fitted later.

Holes (diameter approx. 65 mm) must be drilled in the Uponor UFH Chip board for the underfloor heating pipes, supply lines. It may be helpful to cut an extra hole in line with the first in order to facilitate the use of rising pipes. The position of the hole is shown in the underfloor heating drawing. It should be positioned where the loop field starts or ends.

The protective pipe is secured to the underlying surface using pipe clips

Electrical wiring and pipes are drawn flexibly under the finished floor

The underfloor heating pipes are drawn through conduit pipes to every room with underfloor heating

Install conduit pipe from the manifold cabinet to each loop and connection point. “Connection point” means the place where the underfloor heating pipe is to come up through the Uponor UFH Chip board, grooved 17 (see underfloor heating drawing).

The subfloor system should now be installed according to Granab’s instal-lation instructions.

If the walls are to be plastered, make sure that the gypsum board beneath the mani-fold cabinet does not reach right down to the basefloor. The board must stop level with the upper edge of the Granab floor joist.

Fit the Uponor UFH Chip board over the subfloor system, following Granab’s installation instructions for flooring chipboard. The short sides can be joined as you go along without the joint having to be supported by a floor joist. All joints must be glued in accordance with the instructions.

Secure the conduit pipes as required, with a distance of max 600 mm between the clips. The last clamping ring before the connection point must be no closer than 600 mm. The conduit pipe must stop approx. 150 mm above the finished floor.

Make sure that pipes passing through the chipboard have a soft bend so that the pipe will not press against the parquet or floor surface that will be laid over the Uponor UFH Chip board.


The turning grooves for the underfloor heating pipes must be milled as close to the opposite wall as possible. Check also that the depth of the groove is sufficient. Normally, the depth of the groove cor-responds to the maximum depth of the Uponor Milling Machine.

After vacuuming, the floor surface must be covered with Uponor Heat emission plates. All straight grooves are equipped with plates. The distance between the plates must be 10-100 mm lengthwise.

The underfloor heating pipes can then be installed. Remember to connect the supply and return lines to the correct part of the underfloor heating manifold. Check also that the pipes do not come up and away from the Uponor UFH Chip boards.

All underfloor heating loops must be marked at the underfloor heating manifold in accordance with Uponor’s underfloor heating drawing with room designation and/or loop number.

Before the floor is covered, the under-floor heating system must be tested for tightness in accordance with Uponor’s instructions.

This testing must also be documented in a separate document.

Uponor UFH Chip board, grooved 17Installation over floor joists

The protective pipes containing the underfloor heating pipes are drawn up and connected to the underfloor heating manifold

Once all the loops have been filled and tested for tightness, each underfloor heating loop can be balanced in accor-dance with Uponor’s underfloor heating calculation

It is important that the floor surface layer or protective flooring be fitted as soon as possible after the system has been tested for tightness.

NB! The Uponor UFH Chip board is not intended for use as a working floor.

Follow Granab’s instructions for instal-ling a floor surface layer.

Once installation is complete, install and function test room regulation.

Before installing underfloor heating plates the floor surface must be vacuum-cleaned carefully.


Work begins with the surfaces where the underfloor heating and subfloor systems are to be installed being cleaned and made accessible.

Then install the manifold cabinet with the manifold positioned as shown in the drawing.

Install the feed lines from the heat source to the underfloor heating manifold. The supply line is fitted to the upper mani-fold and the return line to the lower one. Each manifold is equipped with an balancing valve.

The feed lines must be secured sufficiently. Max 800 mm distance between clips.

Install conduit pipe from the manifold cabinet to each loop and connection point. “Connection point” means the place where the underfloor heating pipe is to come up near the Uponor UFH Cassette (see underfloor heating drawing).

Secure the conduit pipes as required, though with a distance of max 600 mm between the clips. The last clamping ring before the connection point must be at least 600 mm away. The conduit pipe must stop approx. 150 mm above the finished floor.

The subfloor system 7000 should now be installed according to Granab’s instal-lation instructions

Uponor UFH Cassette 20 with insulationProcedure for installation

For smaller cross bar compartments, cut fixing plates and underfloor heating cassettes to fit

The underfloor heating cassettes are laid on top of the cassette support

For passage between the subfloor bays there must be a gap of approx. 50 mm between the longitudinal and the trans-verse joist.

Cover the floor surface with Uponor UFH cassettes. The distance between the cassettes must be 10-100 mm lengt-hwise. The cassette stops 300 mm from the transverse floor joist.

Vacuum-clean the Uponor UFH Cas-settes, particularly in the grooves, before beginning to lay the underfloor heating pipes.

Install the underfloor heating pipes in accordance with the underfloor heating drawing produced and connect them to the installed underfloor heating manifold.

If a joist intervall has a c-distance less than 600 mm, the fixing plates should be split and laid as overlapping. Both ends should be fastened together using pop rivets, tape or equivalent.

If the walls are to be plastered, make sure that the gypsum board beneath the manifold cabinet does not reach right down to the floor. The board must stop level with the upper edge of the Granab floor joist.

Once the subfloor system has been instal-led, installation of the underfloor heating cassettes can begin.

In between the joists of the subfloor system, fixing plates for the UFH casset-tes are fitted using the holes beside the joists. Three fixing plates must be fitted for each cassette.


Uponor UFH Cassette 20 with insulationInstallation between floor joists

Follow Granab’s instructions for instal-ling a floor surface layer.

Once installation is complete, install and function test room regulation.

All underfloor heating loops must be marked at the underfloor heating manifold in accordance with Uponor’s underfloor heating drawing with loop number and/or room designation.

Before the floor is covered, the under-floor heating system must be tested for tightness in accordance with Uponor’s instructions. This testing must also be documented in a separate document.

Once all the loops have been filled and tested for leaks, each underfloor heating loop can be adjusted in accordance with Uponor’s underfloor heating calculation

It is important that the floor surface layer or protective flooring be installed as soon as possible after the system has been tested for tightness.

NB! The underfloor heating cassettes are not intended for use as a working floorA finished underfloor heating system must

be tightness tested before the surface layer is installed

An underfloor heating system allows almost complete freedom when it comes to furnishing

Remember to connect the supply and return lines to the correct part of the underfloor heating manifold. Check also that the pipes are not coming loose and touching parts of the joists.

Rising pipes must have a soft bend so that they do not press against the parquet or flooring particle board that will be laid over the joist floor.

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Bygg- och Miljöteknik Granab AB Tel +46 (0)322-66 76 50 Box 172 Fax +46 (0)322-66 76 55SE-447 24 Vårgårda www.granab.se

Safe and simple planningLet us do it for you

When you choose a subfloor system from Granab, we will help to draw in the subfloor system on your plans. We will produce laying plans showing detailed measurements and the positions of all incorporated joists. The joists are cut according to the laying plan, and all incorporated adjustment units with damping elements are pre-installed at the factory.

If you choose an underfloor heating system from Uponor, we will also draw in the underfloor heating loops and the positions of manifolds and thermostats on the plans. You will receive a drawing showing both the subfloor and underfloor heating systems. We will also perform a pressure drop calculation for the underfloor heating system, making the system easier to balance.

Uponor AB Uponor VVS Tel +46 (0)223-380 00Box 2 Fax +46 (0)223-387 10 SE-721 03 Västerås www.uponor.se

Could it be any simpler? Please contact us for more information, planning or an estimate.

The latest information is always available on our websites.

a subfloor system and an underfloor heating system...

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