Thermal insulation

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Documentation of the component
Thermal transmittance (U-value) according to BS EN ISO 6946
Source:
own catalogue
Component: New roof

22. August 2015
Page 1/2

OUTSIDE

ur
p

INSIDE

Assignment: Pitched roof < 70°, with insulation between rafters

1
2
3

Manufacturer

Name

Thickness
[m],
number

Rse
BS EN 12524
BS EN 12524
Own catalogue
Air gaps
Rsi

Bitumen felt/sheet
Concrete, High density
Mineral wool blown
Level 1: dU'' = 0.01 W/(m²K)

Lambda Q
[W/(mK)]

R
[m²K/W]

0.230
2.000
0.040

0.0400
0.0435
0.0700
2.5000

0.0100
0.1400
0.1000

0.1000
0.2500

RT = Rsi + Ri + Rse = 2.75 m²K/W
Correction to U-value for

according to

delta U
[W/(m²K)]
0.008

Air gaps
BS EN ISO 6946 Annex D
Air gaps and fixings corrections need not be applied, as their total effect is less than 3% (Annex D BS 6946:1996).

0.000

U = 1/RT +
Q ..
..
..
..
..
..

U = 0.36 W/(m²K)

The physical values of the building materials has been graded by their level of quality. These 5 levels are the following
A: Data is entered and validated by the manufacturer or supplier. Data is continuously tested by 3rd party.
B: Data is entered and validated by the manufacturer or supplier. Data is certified by 3rd party
C: Data is entered and validated by the manufacturer or supplier.
D: Information is entered by BuildDesk without special agreement with the manufacturer, supplier or others.
E: Information is entered by the user of the BuildDesk software without special agreement with the manufacturer, supplier or others.

Umax =

0.20 W/(m²K)

U=

Source of Umax value: England and Wales Approved Document L1A 2010 Tab 2 Dwellings New
Calculated with BuildDesk 3.4.5

0.36 W/(m²K)

RT=

2.75 m²K/W

Documentation of the component
Heat capacity
Source:
own catalogue
Component: New roof

22. August 2015
Page 2/2

OUTSIDE

The list of materials shown below may differ from those in the U-value calculation
printout. Only material layers which are used in the heat capacity calculation are listed.
Single material layers shown in the U-value calculation printout may be separated to
meet the exclusion criteria:
A .. The total thickness of the layers exceed 0.1 m.
B .. The mid point in the construction is reached.
For insulation layers the following criteria applies:
C .. An insulating layer is reached (defined as lambda <= 0.08 W/(mK)).

INSIDE

Name

End of calculation - Cold
Bitumen felt/sheet
Concrete, High density
Mineral wool blown
Start of calculation - Warm

1
2
3

Thickness
[m]

lambda Q
[W/(mK)]

Thermal Q
capacity
[kJ/(kgK)]

0.230
2.000
0.040

1.00
1.00
1.03

0.0100
0.1400
0.1000

Density Q
[kg/m³]

1100.0
2400.0
12.0

Thermal
mass
kJ/(m²K)
11.0
336.0
0.0

0.2500

Criteria
Exclusion

A, -, C
A, -, C
-, -, C

0.0

Heat capacity = 0.0 kJ/(m²K)
The following exclusion criteria apply:
A .. The total thickness of the layers exceed 0.1 m.
C .. An insulating layer is reached (defined as lambda <= 0.08 W/(mK)).
Q ..
..
..
..
..
..

The physical values of the building materials has been graded by their level of quality. These 5 levels are the following
A: Data is entered and validated by the manufacturer or supplier. Data is continuously tested by 3rd party.
B: Data is entered and validated by the manufacturer or supplier. Data is certified by 3rd party
C: Data is entered and validated by the manufacturer or supplier.
D: Information is entered by BuildDesk without special agreement with the manufacturer, supplier or others.
E: Information is entered by the user of the BuildDesk software without special agreement with the manufacturer, supplier or others.

Calculated with BuildDesk 3.4.5

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