Internal lining
Recticel Eurosarking or Eurowall TF boards may be used to internally line solid masonry walls to improve their thermal performance. There are two methods of installing the boards.
Continuous Insulation
Creating a continuous layer of insulation is more thermally efficient than slotting the insulation between battens or studs - the overall thickness of the system to achieve the required U-value is likely to be thinner and thermal bridging is avoided. Fixing details are as follows:
-
Cut each Eurosarking/Eurowall TF board to fit the room height. If necessary initially secure the boards using a mastic type adhesive
-
Tape the board joints with an aluminium foil tape to create a vapour control layer
-
Mechanically fix vertical timber battens, normally 50 x 25 mm, through the insulation into the wall. Thicker battens may be used if services are to be routed in the batten cavity. Additional horizontal battens are required at the top and bottom of the wall and around all openings
-
Use horizontal battens for heavier wall mounted items
-
Line window and door reveals with thinner boards to minimise thermal bridging
-
Fix the plasterboard lining to the battens in the normal manner. Use foil backed plasterboard or incorporate a 500g polythene VCL if the board joints are not taped
-
Ensure that any gaps in the insulation or plasterboard are sealed at the perimeter of each wall and around window and door reveals
Insulation Between Battens
Slotting the insulation between vertical battens is not only more wasteful of materials and labour intensive but produces a less thermally efficient system. Fixing details are as follows:
-
Mechanically fix vertical timber battens, same thickness as the insulation, into the wall. Thicker battens may be used if services are to be routed in the batten cavity. Additional horizontal battens are required at the top and bottom of the wall and around all openings
-
Cut each Eurosarking/Eurowall TF board to fit tightly between the battens
-
Use horizontal battens for heavier wall mounted items
-
Line window and door reveals with thinner boards to minimise thermal bridging
-
Fix the plasterboard lining to the battens in the normal manner. Use foil backed plasterboard or incorporate a 500g polythene VCL
-
Ensure that any gaps in the insulation or plasterboard are sealed at the perimeter of each wall and around window and door reveals
The following table gives typical U-values achieved on a solid 225mm brick wall.
|
Eurowall TF |
Continuous Insulation
(with batten cavity) |
Insulation Between Battens
(no batten cavity) |
|
Thickness (mm) |
U-Value (W/m2K) |
U-Value (W/m2K) |
|
30 |
0.41 |
0.62 |
|
40 |
0.35 |
0.52 |
|
50 |
0.30 |
0.44 |
|
60 |
0.27 |
0.39 |
|
70 |
0.24 |
0.34 |
|
80 |
0.22 |
0.31 |
|
90 |
0.20 |
0.28 |
|
100 |
0.18 |
0.26 |
|
120 |
0.16 |
0.22 |
|
140 |
0.14 |
0.19 |
For further information or confirmation of the U-values for other wall details please contact Technical Services.
