Solid ground floors with edge insulation

It is often more practical to insulate a floor by means of edge insulation. The edge insulation may be laid horizontally or vertically, as shown in Fig. 6.1. Where horizontal or vertical edge insulation is used instead of all-over insulation, a correction factor is subtracted from the U-value for an uninsulated solid ground floor. The correction factor is a combination of the perimeter to area ratio and an edge insulation factor, *. Thus:

where U0 is the value for an uninsulated floor taken from Table 6.1 (the column for zero thermal resistance), and * is obtained from Table 6.2.

Fig. 6.1 Edge insulation of solid ground floors.

Table 6.2 Edge insulation factors for solid ground floors.

Thermal resistance of insulation, m2K/W

Table 6.2 Edge insulation factors for solid ground floors.

Thermal resistance of insulation, m2K/W

Width of

0.5

1.0

1.5

2.0

m

Edge insulation factor W/mK

0.50

0.13

0.18

0.21

0.22

1.00

0.20

0.27

0.32

0.34

1.50

0.23

0.33

0.39

0.42

Depth of

vertical insulation

m

0.25

0.13

0.18

0.21

0.22

0.50

0.20

0.27

0.32

0.34

0.75

0.23

0.33

0.39

0.42

1.00

0.26

0.37

0.43

0.48

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