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SAPS CALCULATIONS

 
 

U-VALUE - FLOORS

FLOORS SOLUTIONS - Solid Ground

The tables below provide a quick and easy reference guide to the thickness of insulation required to meet the stated U-values for floors.

 

THICKNESS IN MMU-Value 0.25
 

Construction
(100mm Concrete slab, Insulation, Membrane (any), 65mm Screed)
Using the charts: The U-value for floors can be calculated using a perimeter to area ratio (P:A).
To determine the thickness of insulation required, read up for length and across for width of the floor
(ie using the chart below 5 x 4 floor = 65mm).


CELOTEX TUFF-R ™ GA3000Z
KINGSPAN THERMAFLOOR TF70/TP10 ZERO ODP
0.023 LAMBDA λ
   
THICKNESS IN MM
15
75
70
65
60
55
50
50
45
45
40
40
40
35
35
35
14
75
70
65
60
55
50
50
45
45
40
40
40
35
35
35
13
75
70
65
60
55
50
50
45
45
45
40
40
40
40
35
12
75
70
65
60
55
55
50
50
45
45
45
40
40
40
40
11
75
70
65
60
55
55
50
50
50
45
45
45
40
40
40
10
75
70
65
60
55
55
50
50
50
45
45
45
45
40
40
9
75
70
65
60
60
55
55
50
50
50
50
45
45
45
45
8
75
70
65
60
60
55
55
50
50
50
50
50
45
45
45
7
75
70
65
65
60
60
55
55
55
50
50
50
50
50
50
6
75
70
65
65
60
60
60
55
55
55
55
55
50
50
50
5
75
70
65
65
65
60
60
60
60
55
55
55
55
55
55
4
75
70
70
65
65
65
65
60
60
60
60
60
60
60
60
3
75
70
70
70
65
65
65
65
65
65
65
65
65
65
65
2
75
75
70
70
70
70
70
70
70
70
70
70
70
70
70
1
75
75
75
75
75
75
75
75
75
75
75
75
75
75
70
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
   
LENGTH (metres)

 

DOW FLOORMATE 200-X/500-X/STYROFOAM SP-X
KNAUF INSULATION - POLYFOAM FLOORBOARD STANDARD
0.029 LAMBDA λ
THICKNESS IN MM
15
95
85
80
75
70
65
60
60
55
50
50
50
45
45
40
14
95
85
80
75
70
65
60
60
55
55
50
50
45
45
45
13
95
85
80
75
70
65
65
60
55
55
55
50
50
45
45
12
95
85
80
75
70
65
65
60
60
55
55
50
50
50
50
11
95
85
80
75
70
65
65
60
60
60
55
55
55
50
50
10
95
85
80
75
70
70
65
65
60
60
60
55
55
55
50
9
95
85
80
95
75
70
65
650
60
60
60
60
55
55
55
8
95
85
80
95
75
70
65
65
60
60
60
60
55
55
55
7
95
85
85
80
75
75
70
70
65
65
65
65
65
60
60
6
95
85
85
80
75
75
75
70
70
70
65
65
65
65
65
5
95
90
85
80
80
75
75
75
75
70
70
70
70
70
70
4
95
90
85
85
80
80
80
80
75
75
75
75
75
75
75
3
95
90
90
85
85
85
85
80
80
80
80
80
80
80
80
2
95
90
90
90
90
85
85
85
85
85
85
85
85
85
85
1
95
95
95
95
95
95
95
85
95
95
95
95
95
95
95
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
   
LENGTH (metres)
 
U-Value 0.25
 

Construction
(100mm Concrete slab, Insulation, Membrane (any), 65mm Screed)
Using the charts: The U-value for floors can be calculated using a perimeter to area ratio (P:A).
To determine the thickness of insulation required, read up for length and across for width of the floor.
KNAUF INSULATION POLYFOAM
FLOORBOARD EXTRA
Thickness
(MM)
LAMBDA
λ
(Formerly Polyfoam Plus Floorboard (350)
25-35-50
0.029
65-75
0.031
100
0.034
KNAUF INSULATION POLYFOAM
FLOORBOARD EXTRA
Thickness
(MM)
LAMBDA
λ
(Formerly Polyfoam Plus Floorboard (350)
50
0.029
75
0.031
100
0.034
   
   
All highlighted figures = a double layer of insulation
75
 = 50 mm + 25mm or 100mm (single layer)
85
 = 50 mm + 35mm or 100mm (single layer)
100
 = 75 mm + 25mm or 2 layers of 50mm
  Due to varying Lambda values between the differing thickness of insulation boards,
a double layer of insulation may be used to achieve specific U-values
THICKNESS IN MM
15
100
100
85
75
65
65
65
65
65
50
50
50
50
50
50
14
100
100
85
75
75
75
65
65
65
65
50
50
50
50
50
13
100
100
85
75
75
75
65
65
65
65
50
50
50
50
50
12
100
100
85
75
75
75
65
65
65
65
65
50
50
50
50
11
100
100
85
75
75
75
65
65
65
65
65
65
50
50
50
10
100
100
85
75
75
75
75
65
65
65
65
65
65
65
50
9
100
100
85
75
75
75
75
75
65
65
65
65
65
65
65
8
100
100
85
75
75
75
75
75
75
65
65
65
65
65
65
7
100
100
85
85
75
75
75
75
75
75
65
65
65
65
65
6
100
100
85
85
75
75
75
75
75
75
75
75
75
75
65
5
100
100
100
85
75
75
75
75
75
75
75
75
75
75
75
4
100
100
100
85
85
85
85
85
75
75
75
75
75
75
75
3
100
100
10
100
100
85
85
85
85
85
85
85
85
85
85
2
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
1
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
   
LENGTH (metres)

 

U-Value 0.25
 

Construction
(100mm Concrete Slab, Insulation, Membrane (any), 65mm Screed)
Using the charts: The U-value for floors can be calculated using a perimeter to area ratio (P:A).
To determine the thickness of insulation required, read up for length and across for width of the floor.
DOW FLOORMATE 700-A
VENCEL RESIL JABFLOOR 100
0.036 LAMBDA λ
THICKNESS IN MM
15
115
105
100
90
85
80
70
65
65
60
60
55
55
50
50
14
115
105
100
90
85
80
70
70
65
60
60
55
55
50
50
13
115
105
100
90
85
80
75
70
65
65
60
60
60
55
55
12
115
105
100
90
85
80
75
70
70
65
650
60
60
55
55
11
115
105
100
95
85
80
75
70
70
65
65
65
60
60
60
10
115
105
100
95
90
80
75
75
70
70
65
65
65
60
60
9
115
105
100
95
90
80
80
75
75
70
70
70
65
65
65
8
115
105
100
95
90
80
80
75
75
75
70
70
70
70
65
7
115
110
100
95
95
85
80
80
80
75
75
75
75
70
70
6
115
110
100
100
95
90
85
80
80
80
80
80
80
80
80
5
115
110
100
100
100
95
95
90
90
90
85
85
85
85
85
4
115
110
105
100
100
100
95
95
95
95
95
90
90
90
90
3
115
110
110
105
100
100
100
100
100
100
100
100
100
100
100
2
115
115
110
110
110
110
110
105
105
105
105
105
105
105
105
1
120
115
115
115
115
115
115
115
115
115
115
115
115
115
115
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
   
LENGTH (metres)

 

VENCEL RESIL JABFLOOR 70
ROCKWOOL ROCKFLOOR
0.038 LAMBDA λ
THICKNESS IN MM
15
120
110
105
95
90
85
80
75
70
70
65
60
60
55
55
14
120
110
105
95
90
85
80
75
75
70
65
65
60
60
55
13
120
110
105
95
90
85
80
75
75
70
70
65
65
60
60
12
120
110
105
95
90
85
80
80
75
75
70
70
65
65
60
11
120
110
105
95
90
85
85
80
80
75
75
70
70
65
65
10
120
110
105
100
95
90
85
80
80
75
75
75
70
70
70
9
120
110
105
100
95
90
85
85
80
80
80
75
75
75
70
8
120
115
105
100
95
90
90
85
85
80
80
80
75
75
75
7
120
115
110
105
100
95
90
90
85
85
85
80
80
80
80
6
120
115
110
105
95
95
90
90
90
85
85
85
85
85
85
5
120
115
110
105
105
100
100
95
95
95
90
90
90
90
90
4
125
115
110
110
105
105
105
100
100
100
95
95
95
95
95
3
125
120
115
110
110
110
110
105
105
105
105
105
105
105
105
2
125
120
120
115
115
115
115
115
110
110
110
110
110
110
110
1
125
125
125
125
120
120
120
120
120
120
120
120
120
120
120
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
   
LENGTH (metres)

U-Value 0.22
 

Construction
(100mm Concrete slab, Insulation, Membrane, 65mm Screed)
Using the chart: The elemental U-value for floors can be calculated using a perimeter to area ration (P:A).
P = The exposed floor perimeter length in metres. A = the floor area in square metres.
In order to determine the P:A, the length of perimeter is divided by the the floor area.
Eg. a 5 x 4 floor (Perimeter = 18mm & Area = 20m2). The P/A = 0.9
The table below lists the thickness of different insulation materials required to provide a U-value of 0.22 W/m2K.
LAMBDA
λ
0.023
0.025 - 0.021
0.038
0.036
0.030
0.029
0.038
P/A
RATIO
KINGSPAN
THERMAFLOOR
TF70 ZERO ODP &
TP10 ZERO ODP
CELOTEX TUFF-RTM
ZERO GA3000Z
35MM - 90MM
CELOTEX T-BREAKTM
TB 3000
12MM - 30MM
KINGSPAN
KOOLTHERM K3
FLOORBOARD
JABFLOOR 70
JABFLOOR 100
JABLO
FLOORMATE
200-X/500X
STYROFOAM
SP-X
ROCKFLOOR
 
THICKNESS
IN MM
THICKNESS
IN MM
THICKNESS
IN MM
THICKNESS
IN MM
THICKNESS
IN MM
THICKNESS
IN MM
THICKNESS
IN MM
               
0.1
20
20
-
-
-
-
-
0.15
Celotex 20
-
25
20
25
25
-
0.2
30
35
50
45
40
40
50
0.25
-
-
-
-
60
60
-
0.3
50
50
80
75
65
70
80
0.4
60
55
95
90
75
80
90
0.5
65
60
105
100
85
90
100
0.6
70
65
110
105
90
90
110
0.7
75
70
115
110
100
100
115
0.8
80 (75 Celotex)
70
120
115
100
100
120
0.9
80
75
125
120
100
100
120
1.0
80
75
125
125
100
100
125

 
 
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