SIPs Technical Data

Timber is traditionally the most widely used building material. It is easy to handle, natural and brings flexibility to design.

Today, many buildings are built with a traditional timber frame structure and this trend is growing as Building Regulations / Standards strive for better thermal performance and the construction industry moves towards faster and lighter methods of construction. Structural Insulated Panel (SIP) technology is the next generation of timber based construction.

In the UK and Ireland, demand for offsite construction methods such as SIPs is growing rapidly. This is being driven by factors such as the availability of on-site skills being at an all time low.

Building Regulations / Standards are demanding much higher levels of energy efficiency. This is challenging many traditional construction systems and, in some instances, forcing people to look at alternative ways of meeting the requirements more economically. Unparalleled energy efficiency combined with high build-speed and the low site wastage make the Kingspan TEK® Building System a very cost effective way of achieving and exceeding the thermal requirements of the Building Regulations / Standards.

SIPs Bungalow In Lyme Regis, Dorset

Kingspan TEK Specifications

The Kingspan TEK structural insulated panels (SIPs) building system is made up of two sheets of 15mm Oriented Strand Board (OSB) with a high performance, rigid urethane insulation core which is autohesively bonded to the OSB facings.

Available in 142mm and 172mm thickness, Kingspan TEK can be used to construct load-bearing and non-loadbearing walls, roofs and intermediate floors.

Thermal Conductivity	Insulation core: 0.024 W/m.k OSB/3 facings.
Euroclass	The OSB/3 panel linings have a reaction to fire classification of D-s2, d0 to BS EN 13501-1: 2018.
Core	High performance fibre-free rigid urethane insulation manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP).
Facings	15mm Oriented Strand Board type 3 (OSB/3).
Board Size	Width: 1,220 mm Length: Up to 7.5 m Depth: 142 mm / 172 mm Note that panels can fabricated down to a minimum of 200 mm x 200 mm to fit the design of the building.
Green Guide Rating	Wall and roof elements, constructed using the Kingspan TEK Building System in a 142 mm panel thickness, correspond to generic elements with 2008 BRE Global Green Guide Summary Ratings of A+ or A.

Kingspan TEK Considerations

SIPS@Clays recommends using 142mm panels together with an additional layer of internal insulation, as opposed to 172mm panels. This is sensible because:

142mm + 30mm Kingspan Thermawall (U-Value = 0.14) performs better than 172mm panels on their own (U-Value = 0.16) [102.5mm Brick, 50 Cavity, etc]
Additional insulation further reduces the amount of cold bridging due to the insulation being installed in a continuous layer - covering all posts/lintels within the 142mm SIPs
Roof panels have a much smaller eaves detail when using 142mm TEK - which reduces the size of the fascia board required
The foil facing of the internal insulation can be taped to provide a continuous vapour control layer and can also help improve the level of air tightness achieved
The insulation installed into certain junctions i.e., window reveals can help provide improved Psi values.
The slimmer panels also work well with standard sized 140mm wide timber sole plates. Thicker panels not only require larger nonstandard timber sole plates but also require end timbers and timber posts to be increased in size at substantial additional cost.

Typical Constructions and Indicative U-Values

The U-values in the tables that follow have been calculated, under a management system certified to the BBA Scheme for Assessing the Competency of Persons to Undertake U-value and Condensation Risk Calculations, using the method detailed in BS EN ISO 6946: 2017 / I.S. EN ISO 6946: 2007 (Building components and building elements. Thermal resistance and thermal transmittance. Calculation methods) and using the conventions set out in BR 443 (Conventions for U-value calculations).

The U-values in the tables that follow are valid for the constructions shown in the details immediately above. Unless otherwise stated, the U-values quoted are based on an internal construction comprising a 3 mm plaster skim on 12.5 mm plasterboard fixed to 50 x 25 mm softwood timber battens. The external finishes are as specified in the examples themselves.

NB For calculations which do not feature additional internal insulation, a 4% bridging factor has been assumed for walls and 1% for pitched roofs. The thermal conductivity of the timber has been assumed at 0.12 W/mK.

NB Calculations assume that the use of a foil faced breather membrane yields an airspace thermal resistance of 0.54 m²K/W.

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. NB The figures quoted are for guidance only. A detailed U-value calculation together with condensation risk analysis should be completed for each individual project.

NB If your construction is any different to those specified and / or to gain a comprehensive U-value calculation along with a condensation risk analysis of your project please consult the Kingspan Insulation Technical Service Department for assistance (see rear cover for details).

Kingspan TEK® Building System Walls with 102.5 mm Brickwork Outer Leaf

Figure 1

U-Values for Kingspan TEK® Building System Walls with Various Thicknesses of Additional Insulation and Different Breathable Membranes
Thickness of Kingspan TEK® Building System Panels (mm)	Thickness of Kingspan Thermawall® TW55 (mm)	Standard Breathable Membrane U-value (W/m²K)	Foil Faced Breathable Membrane U-value (W/m²K)
142	0	0.19	0.18
142	20	0.15	0.15
142	25	0.15	0.15
142	30	0.14	0.14
142	40	0.13	0.13
142	50	0.13	0.12
142	60	0.12	0.12
142	70	0.11	0.11
142	75	0.11	0.11
142	80	0.11	0.10
142	90	0.10	0.10
172	0	0.16	0.15
172	20	0.13	0.13
172	25	0.13	0.12
172	30	0.12	0.12
172	40	0.12	0.11
172	50	0.11	0.11
172	60	0.11	0.10
172	70	0.10	0.10

Kingspan TEK® Building System Walls with 10 mm Polymer Rendered 100 mm Dense Blockwork Outer Leaf

Figure 2

Kingspan TEK® Building System Walls with 10 mm Polymer Rendered 100 mm Dense Blockwork Outer Leaf
Thickness of Kingspan TEK® Building System Panels (mm)	Thickness of Kingspan Thermawall® TW55 (mm)	Standard Breathable Membrane U-value (W/m²K)	Foil Faced Breathable Membrane U-value (W/m²K)
142	0	0.19	0.18
142	20	0.15	0.15
142	25	0.15	0.14
142	30	0.14	0.14
142	40	0.13	0.13
142	50	0.13	0.12
142	60	0.12	0.11
142	70	0.11	0.11
142	75	0.11	0.11
142	80	0.11	0.10
142	90	0.10	0.10
172	0	0.16	0.15
172	20	0.13	0.13
172	25	0.13	0.12
172	30	0.12	0.12
172	40	0.12	0.11
172	50	0.11	0.11
172	60	0.11	0.10
172	70	0.10	0.10

Kingspan TEK® Building System Wall Panels with Ventilated Cladding

Figure 3

Kingspan TEK® Building System Wall Panels with Ventilated Cladding
Thickness of Kingspan TEK® Building System Panels (mm)	Thickness of Kingspan Thermawall® TW55 (mm)	U-value (W/m²K)
142	0	0.20
142	20	0.16
142	25	0.15
142	30	0.15
142	40	0.14
142	50	0.13
142	60	0.12
142	70	0.12
142	75	0.11
142	80	0.11
142	90	0.11
172	0	0.17
172	20	0.14
172	25	0.13
172	30	0.12
172	40	0.12
172	50	0.11
172	60	0.11
172	70	0.10

Kingspan TEK® Building System Wall Pitched Roofs

Figure 4

Kingspan TEK® Building System Wall Pitched Roofs
Thickness of Kingspan TEK® Building System Panels (mm)	Thickness of Kingspan Thermapitch® TP10 (mm)	U-value (W/m²K)
142	0	0.19
142	20	0.16
142	25	0.15
142	30	0.15
142	40	0.14
142	50	0.13
142	60	0.13
142	70	0.12
142	75	0.11
142	80	0.11
142	90	0.10
172	0	0.16
172	20	0.13
172	25	0.13
172	30	0.12
172	40	0.12
172	50	0.11
172	60	0.11
172	70	0.10