Technical Information: Dimensions, weight, & thermal performance

SIP Panel Dimensions

SIP panels: min/max dimensions in mm

Width	200mm (min) - 1220mm (max)
Length	6250mm (max)

SIP Panel Weights

SIP panels: weights in kg/sqm

Depth	SIP type	Weight
100mm	Standard Internal Wall Partition	18kg/sqm
125mm	Standard External Wall Panel	19kg/sqm
150mm	External Wall / Roof Panel	20kg/sqm
175mm	External Wall / Roof Panel	21kg/sqm

SIP Panel Thickness

SIP panels: thickness

Depth/Thickness	OSB	Polyurethane insulation core
100mm	2 x 12mm OSB	76mm rigid Polyurethane insulation core
125mm	2 x 12mm OSB	101mm rigid Polyurethane insulation core
150mm	2 x 12mm OSB	126mm rigid Polyurethane insulation core
175mm	2 x 12mm OSB	151mm rigid Polyurethane insulation core

Thermal Performance

The Core

The core of Build It Green Structural Insulated Panels is a high performance CFC/HCFC-free rigid urethane insulant of a typical density 33kg/m3.

CFC/HCFC-Free

Build It Green Structural Insulated Panels are manufactured without the use of CFC/HCFCs and have zero Ozone Depletion Potential (ODP).

Thermal Conductivity

Calculations of the thermal transmittance of specific constructions should be based on the thermal conductivity values (Wm^-1 K^-1) of their materials. These are:

SIP panels: Thermal conductivity values

Material	Thermal conductivity values (Wm-1 K-1)
Polyurethane insulation core	0.025 (Wm-1 K-1)
OSB/3	0.13 (Wm-1 K-1)

Typical U-values

A U-value is a measure of heat loss. It is expressed in (W/m²k), and shows the amount of heat lost in watts (W) per square metre of material, when the temperature (k) is one degree lower outside. The lower the U-value, the better the insulation provided by the material.

The typical U-values for building elements is calculated in accordance with BS EN ISO 6946:1997 and BRE report (BR443:2006), and are shown in the table below:

SIP panels: typical U-values

Panel Thickness	U-value (W/m2k)
100mm	0.27
125mm	0.21
150mm	0.17
175mm	0.14

Subject to the composition of the wall or roof section, extremely low U-values can be achieved between 0.1 (W/m²k) and 0.23 (W/m²k).

These U-values are much lower than those of standard construction techniques, demonstrating that SIP panels will insulate your property more efficiently to reduce heat loss.

Next: Fire performance and structural performance

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