Xtratherm - Wall Solutions

Whether you are upgrading an existing property or building new, the addition of an insulated thermal lining to the inside of a wall, roof slope or ceiling will dramatically improve the energy efficiency standards in your home.

The Xtratherm guide to insulated dry lining shows you how to achieve ultimate performance when using Xtratherm thermal liners on walls, giving recommended specifications and installation guidelines to installers, either professional or DIY. This site has a fully interactive dry lining U-value ‘Ready Reckoner’ to determine insulation thickness’s to meet target U-values, accompanied full Installation animations for differing fixing methods on various wall types.

Choose your wall type to start.

Solid Stone : Mechanical Fix Method A
40mm PIR insulation between battens and Thermal liner over battens

Choose Your Required
Thermal Liner Thickness

25mm

0.34

30mm

0.31

40mm

0.27

50mm

0.25

60mm

0.22

70mm

0.20

80mm

0.19

90mm

0.17

Choose The
U-Value You Require

0.25

≥ 50mm

0.21

≥ 70mm

0.17

≥ 90mm

Solid Stone : Mechanical Fix Method B
Thermal Liner mechanically fixed to timber battens.

Choose Your Required
Thermal Liner Thickness

25mm

0.45

30mm

0.41

40mm

0.35

50mm

0.30

60mm

0.27

70mm

0.24

80mm

0.22

90mm

0.20

Choose The
U-Value You Require

0.30

≥ 50mm

0.25

≥ 70mm

0.20

≥ 90mm

Solid Stone : Mechanical Fix Method C
Thermal Liner on proprietary metal furring systems

Choose Your Required
Thermal Liner Thickness

25mm

0.51

30mm

0.43

40mm

0.38

50mm

0.32

60mm

0.28

70mm

0.25

80mm

0.23

90mm

0.21

Choose The
U-Value You Require

0.32

≥ 50mm

0.27

≥ 70mm

0.21

≥ 90mm

Solid Brick : Mechanical Fix Method A
40mm insulation between battens and Thermal liner over battens

Choose Your Required
Thermal Liner Thickness

25mm

0.34

30mm

0.32

40mm

0.28

50mm

0.25

60mm

0.22

70mm

0.20

80mm

0.19

90mm

0.17

Choose The
U-Value You Require

0.25

≥ 50mm

0.21

≥ 70mm

0.17

≥ 90mm

Solid Brick : Mechanical Fix Method B
Thermal Liner mechanically fixed to timber battens.

Choose Your Required
Thermal Liner Thickness

25mm

0.46

30mm

0.42

40mm

0.35

50mm

0.31

60mm

0.27

70mm

0.24

80mm

0.22

90mm

0.20

Choose The
U-Value You Require

0.31

≥ 50mm

0.24

≥ 70mm

0.20

≥ 90mm

Solid Brick : Method C
Thermal Liner on proprietary metal furring systems

Choose Your Required
Thermal Liner Thickness

25mm

0.51

30mm

0.45

40mm

0.37

50mm

0.32

60mm

0.28

70mm

0.25

80mm

0.23

90mm

0.21

Choose The
U-Value You Require

0.32

≥ 50mm

0.27

≥ 70mm

0.21

≥ 90mm

Solid Brick : Mechanical Fix Method D
PIR directly (mechanically) fixed to wall, then service void between timber battens
& then plasterboard over battens

Choose Your Required
Thermal Liner Thickness

25mm

0.46

30mm

0.42

40mm

0.35

50mm

0.31

60mm

0.27

70mm

0.24

80mm

0.22

90mm

0.20

Choose The
U-Value You Require

0.31

≥ 50mm

0.24

≥ 70mm

0.20

≥ 90mm

Solid Brick : Mechanical Fix Method E
Thermal Liner directly (mechanically) fixed to wall

Choose Your Required
Thermal Liner Thickness

25mm

0.62

30mm

0.54

40mm

0.44

50mm

0.37

60mm

0.32

70mm

0.28

80mm

0.25

90mm

0.22

Choose The
U-Value You Require

0.37

≥ 50mm

0.28

≥ 70mm

0.22

≥ 90mm

Solid Brick : Adhesive Fix Method F
Thermal Liner fixed by Dot & Dab Adhesive

Choose Your Required
Thermal Liner Thickness

25mm

0.58

30mm

0.51

40mm

0.42

50mm

0.35

60mm

0.31

70mm

0.27

80mm

0.24

90mm

0.22

Choose The
U-Value You Require

0.35

≥ 50mm

0.27

≥ 70mm

0.22

≥ 90mm

Hollow Block : Mechanical Fix Method A
40mm PIR insulation between battens and Thermal liner over battens

Choose Your Required
Thermal Liner Thickness

25mm

0.35

30mm

0.32

40mm

0.28

50mm

0.25

60mm

0.23

70mm

0.21

80mm

0.19

90mm

0.17

Choose The
U-Value You Require

0.25

≥ 50mm

0.21

≥ 70mm

0.17

≥ 90mm

Hollow Block : Mechanical Fix Method B
Thermal Liner mechanically fixed to timber battens.

Choose Your Required
Thermal Liner Thickness

25mm

0.47

30mm

0.43

40mm

0.36

50mm

0.31

60mm

0.27

70mm

0.25

80mm

0.22

90mm

0.20

Choose The
U-Value You Require

0.31

≥ 50mm

0.25

≥ 70mm

0.20

≥ 90mm

Hollow Block : Mechanical Fix Method C
Thermal Liner on proprietary metal furring systems

Choose Your Required
Thermal Liner Thickness

25mm

0.51

30mm

0.46

40mm

0.38

50mm

0.33

60mm

0.29

70mm

0.25

80mm

0.23

90mm

0.21

Choose The
U-Value You Require

0.33

≥ 50mm

0.27

≥ 70mm

0.21

≥ 90mm

Hollow Block : Mechanical Fix Method D
PIR directly (mechanically) fixed to wall, then service void between timber battens
& then plasterboard over battens

Choose Your Required
Thermal Liner Thickness

25mm

0.47

30mm

0.43

40mm

0.36

50mm

0.31

60mm

0.27

70mm

0.25

80mm

0.22

90mm

0.20

Choose The
U-Value You Require

0.31

≥ 50mm

0.25

≥ 70mm

0.20

≥ 90mm

Hollow Block : Mechanical Fix Method E
Thermal Liner directly (mechanically) fixed to wall

Choose Your Required
Thermal Liner Thickness

25mm

0.64

30mm

0.56

40mm

0.45

50mm

0.38

60mm

0.32

70mm

0.28

80mm

0.25

90mm

0.23

Choose The
U-Value You Require

0.38

≥ 50mm

0.28

≥ 70mm

0.23

≥ 90mm

Hollow Block : Adhesive Fix Method F
Thermal Liner fixed by Dot & Dab Adhesive

Choose Your Required
Thermal Liner Thickness

25mm

0.59

30mm

0.52

40mm

0.43

50mm

0.36

60mm

0.31

70mm

0.27

80mm

0.25

90mm

0.22

Choose The
U-Value You Require

0.36

≥ 50mm

0.27

≥ 70mm

0.22

≥ 90mm

Cavity Wall (No-Insulation) : Mechanical Fix Method A
40mm PIR insulation between battens and Thermal liner over battens

Choose Your Required
Thermal Liner Thickness

25mm

0.33

30mm

0.31

40mm

0.27

50mm

0.24

60mm

0.22

70mm

0.20

80mm

0.18

90mm

0.17

Choose The
U-Value You Require

0.24

≥ 50mm

0.20

≥ 70mm

0.17

≥ 90mm

Cavity Wall (No-Insulation) : Mechanical Fix Method B
Thermal Liner mechanically fixed to timber battens.

Choose Your Required
Thermal Liner Thickness

25mm

0.44

30mm

0.40

40mm

0.34

50mm

0.30

60mm

0.26

70mm

0.24

80mm

0.21

90mm

0.20

Choose The
U-Value You Require

0.30

≥ 50mm

0.24

≥ 70mm

0.20

≥ 90mm

Cavity Wall (No-Insulation) : Mechanical Fix Method C
Thermal Liner on proprietary metal furring systems

Choose Your Required
Thermal Liner Thickness

25mm

0.48

30mm

0.43

40mm

0.36

50mm

0.31

60mm

0.27

70mm

0.24

80mm

0.22

90mm

0.20

Choose The
U-Value You Require

0.32

≥ 50mm

0.27

≥ 60mm

0.20

≥ 90mm

Cavity Wall (No-Insulation) : Mechanical Fix Method D
PIR directly (mechanically) fixed to wall, then service void between timber battens
& then plasterboard over battens

Choose Your Required
Thermal Liner Thickness

25mm

0.44

30mm

0.40

40mm

0.34

50mm

0.30

60mm

0.26

70mm

0.24

80mm

0.21

90mm

0.20

Choose The
U-Value You Require

0.30

≥ 50mm

0.24

≥ 70mm

0.20

≥ 90mm

Cavity Wall (No-Insulation) : Mechanical Fix Method E
Thermal Liner directly (mechanically) fixed to wall

Choose Your Required
Thermal Liner Thickness

25mm

0.58

30mm

0.58

40mm

0.42

50mm

0.36

60mm

0.31

70mm

0.27

80mm

0.24

90mm

0.22

Choose The
U-Value You Require

0.36

≥ 50mm

0.27

≥ 70mm

0.22

≥ 90mm

Cavity Wall (No-Insulation) : Adhesive Fix Method F
Thermal Liner fixed by Dot & Dab Adhesive

Choose Your Required
Thermal Liner Thickness

25mm

0.55

30mm

0.49

40mm

0.40

50mm

0.34

60mm

0.30

70mm

0.26

80mm

0.24

90mm

0.21

Choose The
U-Value You Require

0.36

≥ 50mm

0.27

≥ 70mm

0.22

≥ 90mm

Cavity Wall (40mm EPS) : Mechanical Fix Method A
40mm PIR insulation between battens and Thermal liner over battens

Choose Your Required
Thermal Liner Thickness

25mm

0.24

30mm

0.23

40mm

0.21

50mm

0.19

60mm

0.18

70mm

0.16

80mm

0.15

90mm

0.14

Choose The
U-Value You Require

0.23

≥ 30mm

0.18

≥ 60mm

0.14

≥ 90mm

Cavity Wall (40mm EPS) : Mechanical Fix Method B
Thermal Liner mechanically fixed to timber battens.

Choose Your Required
Thermal Liner Thickness

25mm

0.30

30mm

0.28

40mm

0.25

50mm

0.23

60mm

0.21

70mm

0.19

80mm

0.17

90mm

0.16

Choose The
U-Value You Require

0.28

≥ 30mm

0.21

≥ 60mm

0.16

≥ 90mm

Cavity Wall (40mm EPS) : Mechanical Fix Method C
Thermal Liner on proprietary metal furring systems

Choose Your Required
Thermal Liner Thickness

25mm

0.31

30mm

0.29

40mm

0.26

50mm

0.23

60mm

0.21

70mm

0.19

80mm

0.18

90mm

0.17

Choose The
U-Value You Require

0.26

≥ 40mm

0.21

≥ 60mm

0.17

≥ 90mm

Cavity Wall (40mm EPS) : Mechanical Fix Method D
PIR directly (mechanically) fixed to wall, then service void between timber battens
& then plasterboard over battens

Choose Your Required
Thermal Liner Thickness

25mm

0.30

30mm

0.28

40mm

0.25

50mm

0.23

60mm

0.21

70mm

0.19

80mm

0.17

90mm

0.16

Choose The
U-Value You Require

0.25

≥ 30mm

0.21

≥ 60mm

0.16

≥ 90mm

Cavity Wall (40mm EPS) : Mechanical Fix Method E
Thermal Liner directly (mechanically) fixed to wall

Choose Your Required
Thermal Liner Thickness

25mm

0.36

30mm

0.33

40mm

0.29

50mm

0.26

60mm

0.23

70mm

0.21

80mm

0.17

90mm

0.16

Choose The
U-Value You Require

0.33

≥ 30mm

0.23

≥ 60mm

0.16

≥ 90mm

Cavity Wall (40mm EPS) : Adhesive Fix Method F
Thermal Liner fixed by Dot & Dab Adhesive

Choose Your Required
Thermal Liner Thickness

25mm

0.34

30mm

0.32

40mm

0.28

50mm

0.25

60mm

0.23

70mm

0.21

80mm

0.19

90mm

0.17

Choose The
U-Value You Require

0.32

≥ 30mm

0.23

≥ 60mm

0.17

≥ 90mm