U-Values of Walls Next to Unheated Spaces

Uo = U-value of the element between heated and unheated spaces calculated as if there was no unheated space adjacent to the element (see Table U o below)

Ru = effective thermal resistance of unheated space - see Table 3.1, SAP2001 (extract below).

U-Values for Solar Block with 10mm Joints

Uo (W/m2K)

440mm long x 215mm high blocks with 10mm joints

Solar
(mm)

External finish

Internal finish

100

115

125

150

200

250

No finish

Lwt plaster

1.06

0.96

0.90

0.79

0.63

0.52

12.5mm plasterboard on dabs

0.96

0.87

0.82

0.73

0.59

0.49

22mm ThermaLine BASIC

0.74

0.69

0.67

0.60

0.50

0.42

30mm Thermaline BASIC

0.65

0.60

0.58

0.53

0.45

0.39

40mm ThermaLine BASIC

0.56

0.52

0.51

0.46

0.40

0.35

45 ThermaLine PLUS

U-Values for Solar Block with 2mm Joints

440mm long x 215mm high blocks with 2mm joints

Solar
(mm)

External finish

Internal finish

100

115

125

150

200

250

No finish

Lwt plaster

0.91

0.81

0.76

0.66

0.52

0.42

12.5mm plasterboard on dabs

0.84

0.75

0.71

0.62

0.49

0.41

22mm ThermaLine BASIC

0.67

0.62

0.59

0.52

0.43

0.36

30mm Thermaline BASIC

0.59

0.55

0.53

0.47

0.39

0.34

40mm ThermaLine BASIC

0.52

0.48

0.46

0.42

0.36

0.31

U-Values for Standard Block with 10mm Joints

Uo (W/m2K)

440mm long x 215mm high blocks with 10mm joints

Standard
(mm)

External finish

Internal finish

100

150

200

250

No finish

Lwt plaster

1.26

0.95

0.76

0.64

12.5mm plasterboard on dabs

1.14

0.86

0.70

0.59

22mm ThermaLine BASIC

0.84

0.69

0.58

0.50

30mm Thermaline BASIC

0.72

0.60

0.52

0.46

40mm ThermaLine BASIC

0.61

0.52

0.46

0.41

45 ThermaLine PLUS

U-Values for Standard Block with 2mm Joints

440mm long x 215mm high blocks with 2mm joints

Standard
(mm)

External finish

Internal finish

100

150

200

250

No finish

Lwt plaster

1.13

0.83

0.66

0.55

12.5mm plasterboard on dabs

1.02

0.77

0.62

0.52

22mm ThermaLine BASIC

0.79

0.63

0.53

0.45

30mm Thermaline BASIC

0.68

0.56

0.47

0.41

40mm ThermaLine BASIC

0.58

0.49

0.42

0.37

U-Values for Hi-Seven  Block with 10mm Joints

440mm long x 215mm high blocks with 10mm joints

Hi-Seven
(mm)

External finish

Internal finish

100

250

275

No finish

Lwt plaster

1.43

0.74

0.69

12.5mm plasterboard on dabs

1.26

0.69

0.64

22mm ThermaLine BASIC

0.92

0.57

0.54

30mm Thermaline BASIC

0.78

0.51

0.48

40mm ThermaLine BASIC

0.65

0.45

0.43

45 ThermaLine PLUS

U-Values for Hi-Seven Block with 2mm Joints

440mm long x 215mm high blocks with 2mm joints

Hi-Seven
(mm)

External finish

Internal finish

100

250

275

No finish

Lwt plaster

1.32

0.66

0.61

12.5mm plasterboard on dabs

1.17

0.62

0.58

22mm ThermaLine BASIC

0.88

0.53

0.50

30mm Thermaline BASIC

0.75

0.48

0.45

40mm ThermaLine BASIC

0.63

0.42

0.40

An Extract from Table 3.1, SAP 2001:

Ru for a single garage

Garage type

Element between garage and dwelling

Where the insulated envelope of the dwelling goes round the outside of the garage

Where the walls separating the garage from the dwelling are the external walls

Single, fully integral

Side wall+ end wall + floor

0.68

0.33

One wall + floor

0.54

0.25

Single adjacent

One wall

0.23

0.09

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.

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    H + H Celcon. (2019, April 23). U-Values of Walls Next to Unheated Spaces. AZoBuild. Retrieved on May 28, 2022 from https://www.azobuild.com/article.aspx?ArticleID=7930.

  • MLA

    H + H Celcon. "U-Values of Walls Next to Unheated Spaces". AZoBuild. 28 May 2022. <https://www.azobuild.com/article.aspx?ArticleID=7930>.

  • Chicago

    H + H Celcon. "U-Values of Walls Next to Unheated Spaces". AZoBuild. https://www.azobuild.com/article.aspx?ArticleID=7930. (accessed May 28, 2022).

  • Harvard

    H + H Celcon. 2019. U-Values of Walls Next to Unheated Spaces. AZoBuild, viewed 28 May 2022, https://www.azobuild.com/article.aspx?ArticleID=7930.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this article?

Leave your feedback
(Logout)
Your comment type
Submit
Reducing Embodied Carbon Through Design

Reducing Embodied Carbon Through Design

With an increase in the pressure to decarbonize the built environment and build more carbon-neutral buildings, the reduction of embodied carbon has become of great importance.

Calcium Carbonate Concrete: Building on Recycling

Calcium Carbonate Concrete: Building on Recycling

AZoBuild talks to Professors Noguchi and Maruyama about their research and development of Calcium Carbonate Concrete (CCC), a new material that has the potential to cause a sustainable revolution in the construction industry.

Newsletters you may be interested in

See all Newsletters »