Cavity Walls: U Values (W/m2k) for Partially Filled Cavity Walls Constructed Using Outer Leaf Render

Inner Leaf: With 10mm Joints

Solar

Jumbo Plus

Normal/Plus

Minimum 50mm Clear Cavity

Internal Finish

100 (mm)

100 (mm)

115 (mm)

125 (mm)

150 (mm)

200 (mm)

40mm Jablite EPS70

Dense plaster

0.36

0.36

0.35

0.34

0.32

0.30

Lwt plaster

0.35

0.36

0.34

0.34

0.32

0.29

12.5mm plasterboard on dabs

0.34

0.34

0.33

0.32

0.31

0.28

20 Kingspan TW50

Dense plaster

0.34

0.35

0.34

0.33

0.31

0.28

Lwt plaster

0.34

0.34

0.33

0.32

0.30

0.27

12.5mm plasterboard on dabs

0.33

0.33

0.32

0.31

0.29

0.27

50mm Dritherm

Dense plaster

0.32

0.32

0.31

0.30

0.29

0.26

Lwt plaster

0.31

0.32

0.30

0.30

0.28

0.26

12.5mm plasterboard on dabs

0.30

0.30

0.29

0.29

0.27

0.25

30mm Kingspan TW50

Dense plaster

0.30

0.30

0.29

0.28

0.27

0.25

Lwt plaster

0.29

0.30

0.29

0.28

0.27

0.24

12.5mm plasterboard on dabs

0.28

0.29

0.28

0.27

0.26

0.24

35mm Celotex CW3000

Dense Plaster

0.28

0.29

0.28

0.27

0.26

0.24

Lwt plaster

0.28

0.28

0.27

0.27

0.26

0.23

12.5mm plaster on dabs

0.27

0.27

0.27

0.26

0.25

0.23

U-Values for Partially Filled Cavity Walls Using Celcon Standard Aircrete Blocks

Inner Leaf: With 10mm Joints

Standard

Jumbo Plus

Normal/Plus

Minimum 50mm Clear Cavity

Internal Finish

100 (mm)

100 (mm)

125 (mm)

150 (mm)

190 (mm)

40mm Jablite EPS70

Dense plaster

0.38

0.39

0.37

0.35

0.32

Lwt plaster

0.37

0.38

0.36

0.34

0.32

12.5mm plasterboard on dabs

0.36

0.36

0.35

0.33

0.31

20mm Kingspan TW50

Dense plaster

0.36

0.37

0.35

0.34

0.31

Lwt plaster

0.36

0.36

0.34

0.33

0.31

12.5mm plasterboard on dabs

0.34

0.35

0.33

0.32

0.30

50mm Dritherm

Dense plaster

0.33

0.34

0.32

0.31

0.29

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Lwt plaster

0.33

0.33

0.32

0.30

0.29

12.5mm plasterboard on dabs

0.32

0.32

0.31

0.30

0.28

30mm Kingspan TW50

Dense plaster

0.31

0.32

0.30

0.29

0.27

Lwt plaster

0.31

0.31

0.30

0.29

0.27

12.5mm plasterboard on dabs

0.30

0.30

0.29

0.28

0.26

35mm Celotex CW3000

Dense plaster

0.30

0.30

0.29

0.28

0.26

Lwt plaster

0.29

0.30

0.28

0.27

0.26

12.5 plasterboard on dabs

0.28

0.29

0.28

0.27

0.25

U-Values for Partially Filled Cavity Walls Using Celcon Hi-Strength Aircrete Blocks

Inner Leaf: With 10mm Joints

Hi-Strength

Jumbo Plus

Normal/Plus

Minimum 50mm Clear Cavity

Internal Finish

100 (mm)

100 (mm)

125 (mm)

190 (mm)

40mm Jablite EPS70

Dense plaster

0.40

0.40

0.39

0.35

Lwt plaster

0.39

0.40

0.38

0.34

12.5mm plasterboard on dabs

0.37

0.38

0.36

0.33

20mm Kingspan TW50

Dense plaster

0.38

0.39

0.37

0.33

Lwt plaster

0.37

0.38

0.37

0.33

12.5mm plasterboard on dabs

0.36

0.36

0.35

0.32

50mm Dritherm

Dense plaster

0.35

0.35

0.34

0.31

Lwt plaster

0.34

0.34

0.33

0.30

12.5mm plasterboard on dabs

0.33

0.33

0.32

0.29

30mm Kingspan TW50

Dense plaster

0.32

0.33

0.32

0.30

Lwt plaster

0.32

0.32

0.31

0.28

12.5mm plasterboard on dabs

0.31

0.31

0.30

0.28

35mm Celotex CW3000

Dense plaster

0.31

0.31

0.30

0.28

Lwt plaster

0.30

0.31

0.30

0.27

12.5 plasterboard on dabs

0.29

0.30

0.29

0.26

Block format:
Normal: 440mm long x 215mm high
Plus: 610mm long x 215mm high
JumboPlus: 610mm long x 270mm high

Block face format as inner x 100m thick, with 10mm joints

This information has been sourced, reviewed and adapted from materials provided by H + H Celcon.

For more information on this source, please visit H + H Celcon.

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    H + H Celcon. (2019, April 23). Cavity Walls: U Values (W/m2k) for Partially Filled Cavity Walls Constructed Using Outer Leaf Render. AZoBuild. Retrieved on June 01, 2023 from https://www.azobuild.com/article.aspx?ArticleID=7906.

  • MLA

    H + H Celcon. "Cavity Walls: U Values (W/m2k) for Partially Filled Cavity Walls Constructed Using Outer Leaf Render". AZoBuild. 01 June 2023. <https://www.azobuild.com/article.aspx?ArticleID=7906>.

  • Chicago

    H + H Celcon. "Cavity Walls: U Values (W/m2k) for Partially Filled Cavity Walls Constructed Using Outer Leaf Render". AZoBuild. https://www.azobuild.com/article.aspx?ArticleID=7906. (accessed June 01, 2023).

  • Harvard

    H + H Celcon. 2019. Cavity Walls: U Values (W/m2k) for Partially Filled Cavity Walls Constructed Using Outer Leaf Render. AZoBuild, viewed 01 June 2023, https://www.azobuild.com/article.aspx?ArticleID=7906.

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