Cavity Walls: U Values (W/m2k) for Fully Filled Cavity Walls Constructed Using Outer Leaf Aircrete B

Inner Leaf: With 2mm Celfix Mortar Joints

Solar

Jumbo Plus

Normal/Plus

Internal Finish

100
(mm)

100 (mm)

115 (mm)

150 (mm)

200 (mm)

50mm Dritherm

Dense plaster

0.38

0.38

0.36

0.33

0.29

Lwt plaster

0.37

0.38

0.36

0.32

0.28

12.5mm plasterboard on dabs

0.36

0.36

0.35

0.31

0.28

65mm Dritherm/IsowoolCWS/Rockwool

Dense plaster

0.33

0.33

0.32

0.29

0.26

Lwt plaster

0.33

0.33

0.31

0.29

0.26

12.5mm plasterboard on dabs

0.32

0.32

0.31

0.28

0.25

75mm Rockwool-blown

Dense plaster

0.32

0.32

0.31

0.28

0.25

Lwt plaster

0.31

0.32

0.30

0.28

0.25

12.5mm plasterboard on dabs

0.31

0.31

0.29

0.27

0.24

75mm Dritherm/Jablite EPS70

Dense plaster

0.32

0.32

0.30

0.28

0.25

Lwt plaster

0.31

0.31

0.30

0.27

0.25

12.5mm plasterboard on dabs

0.30

0.30

0.29

0.27

0.24

100mm DrithermPLUS/Rockwool

Dense

0.25

0.25

0.24

0.23

0.21

12.5mm plasterboard on dabs

0.24

.24

0.24

0.22

0.20

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

Inner Leaf: With 2mm Celfix Mortar Joints

Standard

Jumbo Plus

Normal/Plus

Internal Finish

100
(mm)

100 (mm)

125 (mm)

150 (mm)

190 (mm)

50mm Dritherm

Dense plaster

0.42

0.42

0.39

0.37

0.34

Lwt plaster

0.41

0.41

0.38

0.36

0.33

12.5mm plasterboard on dabs

0.39

0.39

0.37

0.35

0.32

65mm Dritherm/IsowoolCWS/Rockwool

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

75mm Rockwool-blown

Dense plaster

0.35

0.35

0.33

0.31

0.29

Lwt plaster

0.34

0.34

0.32

0.31

0.28

12.5mm plasterboard on dabs

0.33

0.33

0.31

0.30

0.28

75mm Dritherm/Jablite EPS70

Dense plaster

0.34

0.34

0.32

0.31

0.28

Lwt plaster

0.33

0.33

0.32

0.30

0.28

12.5mm plasterboard on dabs

0.32

0.32

0.31

0.29

0.27

100mm DrithermPLUS/Rockwool

Dense

0.27

0.27

0.26

0.25

0.23

12.5mm plasterboard on dabs

0.26

0.26

0.25

0.24

0.22

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

Inner Leaf: With 2mm Celfix Mortar Joints

Hi-Strength

Jumbo Plus

Normal/Plus

Internal Finish

100
(mm)

100 (mm)

125 (mm)

150 (mm)

190 (mm)

50mm Dritherm

Dense plaster

0.44

0.44

0.42

0.40

0.37

Lwt plaster

0.43

0.43

0.41

0.39

0.36

12.5mm plasterboard on dabs

0.41

0.41

0.39

0.37

0.35

65mm Dritherm/IsowoolCWS/Rockwool

Dense plaster

0.38

0.38

0.36

0.35

0.32

Lwt plaster

0.37

0.37

0.35

0.34

0.32

12.5mm plasterboard on dabs

0.36

0.36

0.34

0.33

0.31

75mm Rockwool-blown

Dense plaster

0.36

0.36

0.35

0.33

0.31

Lwt plaster

0.35

0.35

0.34

0.33

0.31

12.5mm plasterboard on dabs

0.34

0.34

0.33

0.32

0.30

75mm Dritherm/Jablite EPS70

Dense plaster

0.36

0.36

0.34

0.33

0.31

Lwt plaster

0.35

0.35

0.33

0.32

0.30

12.5mm plasterboard on dabs

0.34

0.34

0.32

0.31

0.29

100mm DrithermPLUS/Rockwool

Dense

0.28

0.28

0.27

0.26

0.25

12.5mm plasterboard on dabs

0.27

0.27

0.26

0.25

0.24

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

215 x 65 x 102.5mm bricks with 10mm joints

Note: A fully filled cavity wall construction is not suitable for all exposure conditions.

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 Fully Filled Cavity Walls Constructed Using Outer Leaf Aircrete B. AZoBuild. Retrieved on December 11, 2019 from https://www.azobuild.com/article.aspx?ArticleID=7902.

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    H + H Celcon. 2019. Cavity Walls: U Values (W/m2k) for Fully Filled Cavity Walls Constructed Using Outer Leaf Aircrete B. AZoBuild, viewed 11 December 2019, https://www.azobuild.com/article.aspx?ArticleID=7902.

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