STANDARD UNDERFLOOR HEATING COMPONENTS FOR SMALL NEW-BUILD RESIDENTIAL PROJECTS Underfloor Heating Available Through Merchants Design and Installation Guide Intelligent Solutions for Heating Projects CI/SfB (56.3) April 2006 UF417 Uniclass EPIC JT20 JV50 L75624 L634 L2242 L511
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STANDARD UNDERFLOOR HEATING
COMPONENTS FOR SMALL
NEW-BUILD RESIDENTIAL PROJECTS
Underfloor HeatingAvailable Through Merchants
Design and Installation Guide
Intelligent Solutions for Heating Projects
CI/SfB(56.3)
April 2006 UF417
Uniclass EPICJT20 JV50 L75624 L634 L2242 L511
UNDERFLOOR HEATING Standard Product Range: Design and Installation Guide
2
Versatility, Consistency and ReliabilityAbout OSMA UFH
A partnership of experience
OSMA Underfloor Heating combines the
specialist skills and experience of two
companies:
Wavin is Europe’s largest supplier of
plastic pipe systems in terms of product
range, innovation, logistical services
and geographical presence
ThermoBoard is one of the UK’s major
suppliers of underfloor heating systems.
The company has pioneered the
development of product-based solutions
to underfloor heating for more than a
decade
The UK’s most advancedUFH technology
OSMA UFH technology has been
developed to suit all building construction
types typically used in the UK – both
concrete-based floors and timber floors.
It provides innovative, cost-efficient
solutions for all types of environment,
including residential, commercial and
public buildings.
For residential projects
This publication provides guidance on
the design and installation of underfloor
heating using OSMA UFH components
available through Merchant Stockists.
These products are primarily designed for
use in new-build residential applications
up to four circuits.
What’s different aboutOSMA Underfloor Heating OSMA UFH products have been designed
to provide the highest possible heating
performance while using materials that will
last throughout the life of the building.
The products combine easy installation
with consistent performance. They ensure
that the power output from the floor is
determined by the product rather than by
the skills or experience of the installer.
OSMA innovationOSMA UFH products are as easy to use
as conventional radiators. They require
little or no previous underfloor heating
experience. No specialist tools are
needed for successful installation.
They enable any installer to work more
quickly to achieve a high quality result.
OSMA UFH systems for domestic
applications include plumbed systems for
all types of floor construction, including:
Sand/cement and liquid screeds
Timber battens and timber joists
Fully floating timber floors
The range available through Merchants is
specifically designed to offer efficient and
effective solutions for small and medium
sized heating projects. These may include:
extensions, refurbishment of individual
rooms, conservatories or single dwelling
installations.
Giving you a choiceOSMA plumbed systems offer you a
OSMA Underfloor Heating is the only UFH supplier in the UK which engineers and manufactures its products. Each system uses the highest specification components. All systems described in this Design andInstallation Guide are directly backed by a fullproduct guarantee provided that installation has been in accordance with the instructionsprovided. Unlike some other UFH suppliers, this guarantee is independently underwritten by insurance. For full details/terms, contact OSMAUnderfloor Heating.
NOTE: For plumbed systems, this Guaranteepresumes the use of OSMA Flexible PlumbingPipe (OsmaGold). The Guarantee may NOTapply if pipe from another manufacturer is used.
Further InformationThe following related publications
are available for OSMA Underfloor
Heating Standard Products Range:
Product Guide
Trade Price List
To obtain copies, please contact:
Sales and TechnicalEnquiriesTel: 01392 444122Fax: 01392 444135
LITERATURE 01249 766333
UNDERFLOOR HEATING Introduction/Standard Product Range
4
Introduction
UNDERFLOOR HEATINGUnderfloor heating is the most comfortable
form of heating. It is unobtrusive,
economical, safe, hygienic and virtually
maintenance-free. It offers the best
long-term method of heating a building
because it uses low-temperature water,
which in future can be provided without
having to burn fossil fuels.
A UFH system is easily formed. Instead
of hanging conventional radiators on
the wall, you simply make the floor itself
a large-surface heat emitter by
incorporating warm water pipe within
the floor construction.
RADIANT HEATAs soon as the floor surface becomes
warmer than the air in the room, it begins
to radiate. Radiant energy emitted from
the floor is absorbed by all the other
surfaces in the room. These surfaces
warm up and begin to radiate, thereby
providing an all-round comfortable
warmth in the room. The air in the
room only becomes warm because it
is in contact with these warm surfaces.
ENERGY EFFICIENTMost new-build constructions can be
kept warm with heating power in the
range 35-75W/m2. This power output
can be achieved with floor surface
temperatures of just 24-27°C.
The maximum floor temperature should
not normally exceed 29°C (although
34°C is acceptable in bathrooms).
THE OSMA STANDARDPRODUCT RANGEThe OSMA Standard Product Range has
1. StaplesIf the insulation you purchase is firm –
for example, extruded polystyrene such
as Polyfoam or Styrofoam, or polyurethane
such as Celotex – staples will provide a
secure fix for the pipe.
2. Screw ClipsIf the insulation is soft – for example,
standard density or high density expanded
polystyrene such as Jablite or mineral
wool such as Rockwool – staples will
not grip the pipe sufficiently tightly.
Screw Clips should be used.
3. System PlatesThese are vacuum-formed plastic panels
with moulded pipe grippers that are laid
over the top of whatever insulation you
purchase. System Plates hold the pipe
securely, and at regular spacings.
OSMA System Plates allow the pipe to
be set as close as 50mm centres, which
is very useful when taking pipe through
corridors to several separate rooms.
The pipe can also be held diagonally.
Whatever the method chosen, attention
should be paid –
where the ends of the pipe circuit(s)
come together below the site of the
Water Flow Controller/Manifold
at the junction between floor and wall,
where the pipe changes from running
horizontally to vertically
In most underfloor heating systems, these
details are the only parts that are visible.
The OSMA Standard Product Range
includes accessories such as Sweep
Bends and Clamps to ensure that these
details can be achieved neatly.
FULLY-FLOATING TIMBER FLOORSThese are floors where panels of insulation
are used to support a timber floor deck
that is normally formed from tongued and
3 What Type Of Floor Do I Have?
Underfloor heating pipe is arranged in
separate pipe circuits within the floor
construction and terminated at the water
flow controller. Prior to connection to the
water flow controller, each pipe circuit
should be pressure-tested, using an
OsmaGold Pressure-Tester. The pressure
test should be dated and recorded as a
permanent record (see pages 23-24).
CONTINUOUS PIPE LENGTHSIf the pipe circuit is a continuous pipe
length, the test pressure should be 3 bar.
This will be sufficient to determine whether
the pipe has been punctured during
installation, by a nail for example.
PIPE LENGTHS WITH FITTINGSIf the circuit includes OsmaGold fittings, as
it may when Chipboard Modules are used
or Heating Panels have been installed in an
I-Beam joisted floor, each circuit should
be tested to at least 18 bar.
After each pipe circuit has been pressure-
tested, connect the pipe ends to the Water
Flow Controller. Do not pressure test pipe
circuits AFTER connection to the Water
Flow Controller.
4 Pressure Testing
grooved panels of chipboard or plywood.
The floor deck is held in place purely by its
own weight.
The Standard Product Range includes
50mm thick Floating Floor Panels that
incorporate pre-cut pipe channels with
factory-fitted aluminium heat diffusers, and
a polythene film fixed over the top of these.
They are used in place of plain insulation
panels to support a fully-floating deck.
The conductivity of OSMA Floating Floor
Panels is much lower than expanded
polystyrene, and this helps minimise
downward heat loss.
Timber Battens, Joists and I-BeamsBattens are used either where the floor
loadings are to be higher than can be
supported by a fully-floating floor or where
the floor deck is to be formed from planks
that must be nailed down to a support,
rather than be allowed to fully float.
Softwood joists are commonly used in
Intermediate Floors although
manufactured I-Beams are often used
instead because they can be stronger and
are more stable dimensionally.
The Standard Product Range includes
50mm thick Batten/Joist panels, similar to
Floating Floor Panels but 340mm wide,
which are intended to fit between 50mm
thick battens and automatically space
these at nominal 400mm centres, or to be
fitted between softwood joists at similar
centres, either from above or below, or to
be fitted up from below between I-Beams.
For Product Range, see pages 12–13
LITERATURE 01249 766333
UNDERFLOOR HEATING Design Procedures ■ General Considerations
10
SMALL PROJECTSIn small projects, covering areas less than
20m2, either Single Port Manifold and
Control Pack, or Water Mixing Control can
be used.
AREAS GREATER THAN 20m2
In larger projects a manifold should be used
up to a maximum of four ports.
Or:
It is recommended that the supply to the
Water Mixing Controller should be taken
from the heating Primary, either before
or after any timed Diverter Valve, which
controls the supply to radiators for
example, as required. The electrical supply
to the Water Mixing Controller can be
timed or otherwise, as required, although
in general the wiring should be arranged
so that it cannot operate if there is no
heated water in the Primary. The pipe
providing water to the Controller should
have sufficient capacity to supply the
quantity of heat required by the section of
UFH attached to it.
5 Water Flow Control
Either standard or programmable room
thermostats may be used (purchased
separately).
In small projects, where there is a single
zone, the electrical feed that is used to
enable/disable the Water Mixing Controller
(generally the Boiler Live) is fed through the
room thermostat to the controller.
In projects having more than onetemperature zone, the flow of water intoeach circuit is controlled by a 2Wire Actuator on each circuit branch,
which is opened/closed under the controlof its associated room thermostat. TheOSMA UH1-M Wiring Centre connectseach room thermostat to the appropriateactuator. The operation of any oneactuator will turn on the Water MixingController and boiler and initiate the flowof heated water to it.
6 Room Temperature Control
7 Project Design
Once the most appropriate products have
been selected, a dimensioned design/
installation drawing should be produced. A
Design Planning Grid is produced on page
30 of this brochure to help with
project design.
The drawing should show where each
floor component and the Water Mixing
Controller is to be sited. This will also
assist in producing a full schedule of the
materials required.
INSTALLATIONPROCEDURESGenerally, products should be installed
in the following stages:
1. Clear the space to be heated
2. Install Floor Components and Pipe
3. Conduct pressure-test
4. Install Water Mixing Controls and
connect circuits
5. Connect up Electrics
6. Commission
Important NotesNever bend 15mm OsmaGold pipe
more tightly than a radius of 120mm.
If you have bent the pipe too tightly and
it has kinked the pipe needs to
be replaced
Always cut OsmaGold pipe using an
OsmaGold cutter or sharp secateurs.
Never use a saw blade
Always use pipe inserts whenever a
joint is formed
Never use joints in pipe if pipe is
going to be placed in screed
Always allow screeds to dry naturally.
Don’t use UFH pipe as a way of
speeding up the drying process
GENERAL CONSIDERATIONS
Response times:Setting pipe within a 65-75mm screed
will form an underfloor heating system
with quite high thermal mass. From
cold, it will have to warm up the mass
of the screed before the top surface
can begin to radiate. Once warm,
it will continue to produce heat for
several hours even after the boiler
has turned off
Underfloor heating in a timber floor has
a smaller thermal mass to warm up
before it starts to work but it will cool
down more quickly after the boiler has
turned off
Additives:Generally, the additives that the boiler
The range is supplied by OSMA Underfloor Heating which is the trading name of ThermoBoard Limited.
OSMA is a registered trade mark of Wavin Plastics Ltd and is used by ThermoBoard Limited under licence.
ThermoBoard Limited operates a programme of continual product development, and therefore reserves the right tomodify or amend the specification of their products without notice. All information in this publication is given in good faith, and believed to be correct at the time of going to press. However, no responsibility can be accepted for any errors, omissions or incorrect assumptions. Users should satisfy themselves that products are suitable for thepurpose and application intended.
Underfloor HeatingAvailable Through Merchants
Design and Installation Guide
www.wavin.co.uk
UF4
17
For screeded and timber floorsThis brochure provides detailed guidance