Cavity Walls: U Values (W/m2k) for Partially Filled Cavity Walls Constructed Using Aircrete Blocks

Inner Leaf: With 2mm Celfix Mortar Joints

Solar

Jumbo Plus

Normal/Plus

Minimum 50mm Clear Cavity

Internal Finish

100 (mm)

100 (mm)

115 (mm)

125 (mm)

150 (mm)

200 (mm)

50mm Jablite EPS70

Dense plaster

0.37

0.37

0.36

0.35

0.32

0.28

Lwt plaster

0.36

0.36

0.35

0.34

0.32

0.28

12.5mm plasterboard on dabs

0.35

0.35

0.34

0.33

0.31

0.27

50mm Dritherm

Dense plaster

0.36

0.36

0.34

0.33

0.31

0.27

Lwt plaster

0.35

0.35

0.34

0.33

0.30

0.27

12.5mm plasterboard on dabs

0.34

0.34

0.33

0.32

0.30

0.26

25mm Kingspan TW50

Dense plaster

0.36

0.36

0.35

0.34

0.31

0.28

Lwt plaster

0.35

0.35

0.34

0.33

0.31

0.27

12.5mm plasterboard on dabs

0.34

0.34

0.33

0.32

0.30

0.26

30mm Kingspan TW50

Dense plaster

0.33

0.33

0.32

0.31

0.29

0.26

Lwt plaster

0.33

0.33

0.31

0.31

0.29

0.26

12.5mm plasterboard on dabs

0.32

0.32

0.31

0.30

0.28

0.25

35mm Celotex CW3000

Dense Plaster

0.32

0.32

0.31

0.30

0.28

0.25

Lwt plaster

0.31

0.31

0.30

0.29

0.28

0.25

12.5mm plaster on dabs

0.30

0.30

0.29

0.28

0.27

0.24

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

Inner Leaf: With 2mm Celfix Mortar  Joints

Standard

Jumbo Plus

Normal/Plus

Minimum 50mm Clear Cavity

Internal Finish

100 (mm)

100 (mm)

125 (mm)

150 (mm)

190 (mm)

50mm Jablite EPS70

Dense plaster

0.41

0.41

0.38

0.36

0.33

Lwt plaster

0.40

0.40

0.37

0.35

0.32

12.5mm plasterboard on dabs

0.38

0.38

0.36

0.34

0.31

50mm Dritherm

Dense plaster

0.39

0.39

0.37

0.35

0.32

Lwt plaster

0.38

0.38

0.36

0.34

0.31

12.5mm plasterboard on dabs

0.37

0.37

0.35

0.33

0.30

25mm Kingspan TW50

Dense plaster

0.39

0.39

0.37

0.35

0.32

Lwt plaster

0.38

0.38

0.36

0.34

0.31

12.5mm plasterboard on dabs

0.37

0.37

0.35

0.33

0.31

30mm Kingspan TW50

Dense plaster

0.36

0.36

0.34

0.32

0.30

Lwt plaster

0.35

0.35

0.33

0.32

0.29

12.5mm plasterboard on dabs

0.34

0.34

0.32

0.31

0.29

35mm Celotex CW3000

Dense plaster

0.34

0.34

0.33

0.31

0.29

Lwt plaster

0.34

0.34

0.32

0.30

0.28

12.5 plasterboard on dabs

0.32

0.32

0.31

0.29

0.27

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

Inner Leaf: With 2mm Celfix Mortar Joints

Hi-Strength

Jumbo Plus

Normal/Plus

Minimum 50mm Clear Cavity

Internal Finish

100 (mm)

100 (mm)

125 (mm)

150 (mm)

50mm Jablite EPS70

Dense plaster

0.43

0.43

0.41

0.36

Lwt plaster

0.42

0.42

0.40

0.35

12.5mm plasterboard on dabs

0.40

0.40

0.38

0.34

50mm Dritherm

Dense plaster

0.41

0.41

0.39

0.34

Lwt plaster

0.40

0.40

0.38

0.34

12.5mm plasterboard on dabs

0.38

0.39

0.37

0.33

25mm Kingspan TW50

Dense plaster

0.41

0.41

0.39

0.35

Lwt plaster

0.40

0.41

0.39

0.34

12.5mm plasterboard on dabs

0.39

0.39

0.37

0.33

30mm Kingspan TW50

Dense plaster

0.38

0.38

0.36

0.32

Lwt plaster

0.37

0.37

0.35

0.32

12.5mm plasterboard on dabs

0.36

0.36

0.34

0.31

35mm Celotex CW3000

Dense plaster

0.36

0.36

0.35

0.31

Lwt plaster

0.35

0.35

0.34

0.30

12.5 plasterboard on dabs

0.34

0.34

0.32

0.29

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

215x65x102.5mm bricks 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 Aircrete Blocks. AZoBuild. Retrieved on November 28, 2023 from https://www.azobuild.com/article.aspx?ArticleID=7905.

  • MLA

    H + H Celcon. "Cavity Walls: U Values (W/m2k) for Partially Filled Cavity Walls Constructed Using Aircrete Blocks". AZoBuild. 28 November 2023. <https://www.azobuild.com/article.aspx?ArticleID=7905>.

  • Chicago

    H + H Celcon. "Cavity Walls: U Values (W/m2k) for Partially Filled Cavity Walls Constructed Using Aircrete Blocks". AZoBuild. https://www.azobuild.com/article.aspx?ArticleID=7905. (accessed November 28, 2023).

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    H + H Celcon. 2019. Cavity Walls: U Values (W/m2k) for Partially Filled Cavity Walls Constructed Using Aircrete Blocks. AZoBuild, viewed 28 November 2023, https://www.azobuild.com/article.aspx?ArticleID=7905.

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