Uninsulated suspended ground floors

The U-values for uninsulated suspended ground floors are given in Table 6.3. These values can be used when:

• The floor deck is not more than 500 mm above the external ground level

• The wall surrounding the underfloor space is uninsulated.

Table 6.3 U-values for uninsulated suspended ground floors.

Ventilation opening area per unit area of underfloor space Perimeterto 0.0015 m2/m 0.0030 m2/m area ratio -

m/m2 U-value of suspended ground floor, W/m2K

Ventilation opening area per unit area of underfloor space Perimeterto 0.0015 m2/m 0.0030 m2/m area ratio -

m/m2 U-value of suspended ground floor, W/m2K

0.05

0.15

0.15

0.10

0.25

0.26

0.15

0.33

0.35

0.20

0.40

0.42

0.25

0.46

0.48

0.30

0.51

0.53

0.35

0.55

0.58

0.40

0.59

0.62

0.45

0.63

0.66

0.50

0.66

0.70

0.55

0.69

0.73

0.60

0.72

0.76

0.65

0.75

0.79

0.70

0.77

0.81

0.75

0.80

0.84

0.80

0.82

0.86

0.85

0.84

0.88

0.90

0.86

0.90

0.95

0.88

0.92

1.00

0.89

0.93

The U-values depend on the amount of ventilation which is provided to the underfloor space. This is expressed as the area in square metres of ventilation opening per unit length in metres of floor perimeter, and the table provides data for two typical values.

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