Gf08-Underfloor Heating
Gf08 - Ground Floors - Underfloor Heeating
Advantages
- Fast and accurate installation is achievable with pipe
installed at the required centres using the pre-printed laying
grid
- Insulation and heating is provided by one complete system
- Available in two compressive strengths, allowing underfloor
heating to be used in buildings where a high load will be exerted
on the floor
- Holds the clips extremely well, making installtion quicker and
easier
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Products
Polyfoam Tackaboard panels are rigid sheets of
extruded polystyrene insulation that are pre-printed with a
measured setting out grid for easy installation of the underfloor
heating system, using either clips, staples or a rail system. They
retain all the benefits of Polyfoam extruded polystyrene, making it
an ideal solution for use in a wide variety of floors.
Typical construction
A solid concrete ground floor slab on a damp proof membrane on
blinded hardcore. Polyfoam Tackaboard laid over the whole of the
concrete floor slab, the heating pipes, using clips, staples or
rails, installed and covered with either a liquid or traditional
screed finish. Polyfoam Tackaboard is a specially designed solution
for use in a wide range of underfloor heating systems. The measured
spacing grid, pre-marked on the insulation, makes it particularly
suitable for heating pipes installed using staples, clips or a rail
system. The printed grid on the Polyfoam Tackaboard provides a
measured spacing format for quick, accurate installation.
Installation
The concrete slab is cast in the normal manner, with the damp
proof membrane below the slab. Starting from the corner furthest
from the manifold outlet connection lay the Polyfoam Tackaboard,
ensuring that the grids are in line. Continue until the entire
floor area to be insulated and heated is covered with Polyfoam
Tackaboard.
Starting from the manifold, lay the single run of pipe, pushing
it firmly into the insulation boards. Following the pattern of the
pre-printed laying grid at the required centres until the pipe
returns to the manifold system, cut and connect. Test the system
before finishing the floor.
Lay the liquid or traditional cement:sand screed to the
specified depth. Polyfoam Tackaboard is suitable for use with both
liquid screeds and a traditional cement:sand screed.
Alternatively, the UFH system is installed within the concrete
floor slab which is laid on top of Polyfoam Tackaboard.
Performance
Thermal performance
The thermal conductivities of Polyfoam Tackaboard products are
as follows:
- Standard – 0.029W/mK
- Extra – 0.029-0.034 W/mK
Table 76 gives U-values for a range of perimeter/area ratios for
both solid and suspended beam and block ground floors.
Fire performance
When Polyfoam Tackaboard
is installed below a screed it will not contribute to the
development stages of a fire.
Compression resistance
Polyfoam Tackaboard is highly resistant to compression – see
below table
Table 75: Compressive creep results for
Polyfoam Tackaboard
|
Product
|
Load applied
(kPa)
|
Initial compression
(%)
|
Further compression after 50
years
(%)
|
| Polyfoam Tackaboard Standard |
60 |
2 |
1.5
|
| Polyfoam Tackaboard Extra |
120 |
2 |
1.5
|
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Typical specification
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Polyfoam Tackaboard Standard*/ Extra* ......mm thick, to be
closely butted and placed over the whole area of the floor.
Polyfoam Tackaboard, at least 25mm thick, to be cut and placed to
full depth of screed at the floor perimeter.
A single run of pipe to be fixed firmly into the insulation
boards following the pattern of the pre-printed laying grid at
required pipe centres until the pipe returns to the manifold
system. The pipes to be tested before the screed is laid.
A 65mm thick sand/cement screed with wire mesh*/ polypropylene
reinforcing fibres* to be laid on top. (NHBC recommend a D49 fabric
mesh for use in floating screeds.) Floor finish as specified by the
designer. (* delete as appropriate)
Alternatively, refer to NBS clause: M10/40 or M10/290
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Typical section
Table 76: U-values of concrete
ground floor slab insulated with Polyfoam Tackaboard below a
screed
| Thickness (mm) |
Ratio of
Perimeter (m) to Area (m2) |
| |
0.10 |
0.20 |
0.30 |
0.40 |
0.50 |
0.60 |
0.70 |
0.80 |
| Polyfoam Tackaboard |
| 160 (75+65*) |
0.09 |
0.11 |
0.13 |
0.13 |
0.14 |
0.14 |
0.15 |
0.15 |
| 140 (75+65*) |
0.09 |
0.12 |
0.14 |
0.15 |
0.15 |
0.16 |
0.16 |
0.17 |
| 125 (50+75*) |
0.10 |
0.13 |
0.15 |
0.16 |
0.17 |
0.17 |
0.18 |
0.18 |
| 100 (50+50*) |
0.11 |
0.15 |
0.17 |
0.19 |
0.20 |
0.20 |
0.21 |
0.22 |
| 85 (35+50*) |
0.12 |
0.16 |
0.19 |
0.21 |
0.22 |
0.23 |
0.24 |
0.24 |
| 75.00 |
0.12 |
0.17 |
0.20 |
0.22 |
0.24 |
0.25 |
0.26 |
0.26 |
| 65.00 |
0.13 |
0.19 |
0.22 |
0.24 |
0.26 |
0.27 |
0.28 |
0.29 |
| 50.00 |
0.14 |
0.21 |
0.25 |
0.28 |
0.30 |
0.32 |
0.33 |
0.34 |
| 35.00 |
0.15 |
0.23 |
0.29 |
0.33 |
0.36 |
0.38 |
0.40 |
0.42 |
| Beam and Block - Polyfoam
Tackaboard |
| 160 (75+65*) |
0.10 |
0.12 |
0.13 |
0.14 |
0.14 |
0.14 |
0.15 |
0.15 |
| 140 (75+65*) |
0.11 |
0.13 |
0.14 |
0.15 |
0.16 |
0.16 |
0.16 |
0.16 |
| 125 (50+75*) |
0.12 |
0.14 |
0.16 |
0.16 |
0.17 |
0.17 |
0.18 |
0.18 |
| 100 (50+50*) |
0.13 |
0.16 |
0.18 |
0.19 |
0.20 |
0.20 |
0.21 |
0.21 |
| 85 (35+50*) |
0.14 |
0.18 |
0.20 |
0.21 |
0.22 |
0.23 |
0.23 |
0.24 |
| 75.00 |
0.14 |
0.19 |
0.21 |
0.23 |
0.24 |
0.25 |
0.25 |
0.26 |
| 65.00 |
0.15 |
0.20 |
0.23 |
0.25 |
0.26 |
0.27 |
0.28 |
0.29 |
| 50.00 |
0.16 |
0.23 |
0.26 |
0.29 |
0.30 |
0.32 |
0.33 |
0.33 |
| 35.00 |
0.18 |
0.26 |
0.30 |
0.33 |
0.36 |
0.38 |
0.39 |
0.40 |
Note: The U-values have been
calculated using BS EN ISO 13370: 1998 and assume a clay subsoil
with a thermal conductivity of 1.50 W/mK.
For project specific calculations contact our Technical Advisory
Centre on 01744 766666.
*Polyfoam Floorboard Standard laid underneath