Based in Unit 102 Coolmine Ind Est

Kooltherm Soffit Insulation

Typical U-Values

The following examples have been calculated using both the combined method and the proportional area method. The combined method is required for compliance with Building Regulations/Standards revised after the year 2000. These examples are based on the use of Kingspan Kooltherm ® K10 Soffit Board fixed direct to the soffit of a 200 mm concrete deck with 50 mm screed. If your construction is any different, please consult our Technical Services Department (see rear cover).

Kingspan Kooltherm ® K10 Soffit Board

Insulant Thickness

U–value (W/m .K)

  (mm)

Combined Method 

Proportional Area Method

25

30

35

40

45

50

60

70

75

80

90

0.68

0.59

0.52

0.47

0.41

0.38

0.32

0.28

0.26

0.25

0.22

0.68

0.59

0.52

0.47

0.41

0.38

0.32

0.28

0.26

0.25

0.22

Combined Method – U–values were calculated using the method which has been adopted to bring National standards in line with the European Standard calculation method, BS/I.S. EN ISO 6946: 1997 (Building components and building elements. Thermal resistance and thermal transmittance. Calculation method).

Proportional Area Method – the U–values shown below were calculated using the proportional area method as detailed in The Chartered Institute of Building Services Engineers (CIBSE) Guide A3 (Thermal Properties of Building Structures).

NB when calculating U–values to BS/I.S. EN ISO 6946: 1997, the type of fixing used may change the thickness of insulation required. For the purposes of these calculations, the use of insulation fasteners with a cross sectional area of 18.1 mm has been assumed. Please contact the Kingspan Insulation Technical Services Department (see rear cover) for project calculations.

NB for the purposes of these calculations the standard of workmanship has been assumed good and therefore the correction factor for air gaps has been ignored. The figures below are for guidance only. A detailed U–value calculation together with a condensation risk analysis should be completed for each individual project. Please call our Technical Services Department for assistance (see rear cover).

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Product Data

Standards and Approvals

Kingspan Kooltherm ® K10 Soffit Board is manufactured to the highest standards under a quality control system approved to BS EN ISO 9002: 1994 (Quality systems. Model for quality assurance in production, installation and servicing).

Standard Dimensions

Kingspan Kooltherm ® K10 Soffit Board is available in the following standard sizes and thicknesses.

Nominal Dimension

Availability

Length (m)

2.4

Width (m) 

1.2

Insulant Thickness*(mm) 

25, 30, 40, 45, 50, 60, 65, 70, 75, 80, 90

*Other thicknesses are available subject to quantity

Insulation Compressive Strength

Typically exceeds 100 kPa at 10% compression when tested to BS EN 826: 1996 (Thermal insulating products for building applications. Determination of compression behaviour).

Water Vapour Resistance

Modified to include board facings, the boards achieve a resistance far greater than 100 MN.s/g, when tested in accordance with BS 4370: Part 2: 1993.

Durability

If correctly applied, Kingspan Kooltherm ® K10 Soffit Board has an indefinite life. Its durability depends on the supporting structure and the conditions of its use.

Resistance to Solvents, Fungi and Rodents

The insulation core is resistant to dilute acids, alkalis, mineral oil and petrol. It is not resistant to some solvent–based adhesive systems, particularly those containing methyl ethyl ketone. Adhesives containing such solvents should not be used in association Kingspan Kooltherm ® K10 Soffit Board. Boards which have been in contact with harsh solvents, petrol, mineral oil or acids, or boards that have been damaged in any way should not be used. The insulation core and facings used in the manufacture of Kingspan Kooltherm ® K10 Soffit Board resist attack by mould and microbial growth and do not provide any food value to vermin.

Manufactured to BS EN ISO 9002: 1994 Certificate No. 388/2

Fire Performance

The rigid phenolic insulation core of Kingspan Kooltherm ® K10 Plus Soffit Board will achieve the results given below which enables it to be classified by the Building Regulations as being Class O rated.

Test

 Result

BS 476: Part 6:1989 (Fire Propagation Test)

Index of performance (1) not  exceeding 12 and sub Index (i1) not exceeding 6 for rigid phenolic insulation core

BS 476: Part 7: 1997 (Surface Spread of Flame Test)

Class 1 rating for rigid phenolic insulation core 

BS 5111: Part 1: 1974 (Smoke Obscuration)

< 5%

Thermal Properties

The l –values and R–values quoted are in accordance with the Harmonised European Standard BS EN 13166: 2001 (Thermal insulation products for buildings – Factory made products of phenolic foam (PF) – Specification) using so called 90/90 principles. Comparison with alternative products may not be appropriate unless the same procedures have been followed.

Thermal Conductivity

Kingspan Kooltherm ® K10 SOFFIT BOARDThe boards achieve a thermal conductivity (–value) of 0.023 W/m.K (insulant thickness 25–44 mm), 0.022 W/m.K (insulant thickness =45 mm).

Thermal Resistances

Kingspan Kooltherm ® K10 SOFFIT BOARD Thermal resistance (R–value) varies with thickness and is calculated by dividing the thickness of the board (expressed in metres) by its thermal conductivity.

Insulant Thickness (mm)

 Thermal Resistance (m2 .K/W)

25
30
35
40
45
50
60
65
70
75
80
90

1.05
1.30
1.50
1.70
2.00
2.25
2.70
2.95
3.15
3.40
3.60
4.05