SIPS Specifications

Standard Details

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sips specifications

External Finishes and Rainscreen Claddings - Walls

As soon as possible after Hemsec by SBUK SIP panels walls have been erected, a breathable membrane, e.g. TF200, should be fixed directly to the panels. External cladding should be installed over the breathable membrane.

The following are examples of external cladding for walls:

External Roof Finishes

Roof Finishes


  • Interlocking concrete tiles are large format and are generally the most cost effective
  • Plain tiles may be concrete or clay and they cover an average of sixty to the square metre, and so have a consequential increased labour cost. Plain tiles are often used for tile hanging


  • May be stone, quarried slate or man-made
  • Man-made slates are available and are made from either fibre and cement or moulded with a mixture of slate dust and glass fibre resin


  • SIP Build UK houses can accommodate most types of roof covering. If you intend to use natural or man-made slate it is important that details are agreed prior to the structure construction
  • Tiled roofs will require nailing according to the exposure rating and the manufacturer’s recommendations

As soon as the tilers have finished, decorate the facia and fix the guttering prior to the scaffolding coming down

Thermal Properties

U–values (W/m2.K) for Hemsec Building System Walls with Various Thicknesses of Additional Insulation and Different Breathable Membranes.
SIP Thermal Performance Chart - SIP Build UK
The u–values detailed below are quoted in accordance with BS EN ISO 6946:1997 and BRE report (BR443:2006)

Thermal Conductivity

Thermal conductivity (λ–value) of the OSB/3 component of Hemsec by SBUK SIP panels should be taken as 0.13 W/m.K. The thermal conductivity of the insulation core of Hemsec by SBUK SIP panels is 0.028 W/m.K.


In addition to the excellent U–values that can be achieved by walls and roofs constructed using the, Hemsec by SBUK SIP panels the closed cell structure of the rigid urethane insulation core of the panels does not allow movement of air within them.

The insulation will not sag or physically deteriorate over time, as may be the case with other insulating materials.

Air leakage levels can be as good as 0.08 air changes per hour at normal pressures (approximately 1 m3/hour/m2 at 50 Pa). Standard results would be 3 air changes per hour. This is subject to the quality of the overall build.

The Facings

The Hemsec SIPs panel comprises of BBA Approved 15mm Internal and 15mm External Oriented Strand Board (OSB)
grade 3 facings. OSB/3 has a thermal conductivity value λ of 0.13 W/mK.
Manufactured to specification EN 13986 and EN 300:2006, OSB/3 comprises of strands of softwood bonded
together using a formaldehyde free synthetic resin.
The OSB boards are responsibly sourced and comply to FSC and PEFC chain of custody requirements.
Further information and Certification can be obtained on request through Hemsec SIPs.

The Core

The core of Hemsec by SBUK SIP panels are a closed cell Polyurethane rigid foam system with zero Ozone Depletion Potential (ODP) supplied by BASF
Polyurethanes Europe.
The PUR core is CFC and HCFC free providing a < 5 value for GWP, as specified by various regulatory bodies.

Structural Dimensions

Hemsec by SBUK SIP panels are available in the following standard size(s):


Water Vapour Resistance

Assessed to be acceptable in relation to the intended use of the
building and any limitations regarding climatic zones


Hemsec SIPs are manufactured from the highest quality materials, using state of the art production equipment to rigorous quality control standards, complying with ISO9001:2008 standard, ensuring long-term reliability and service life. Hemsec BBA Certificate

The panels will have comparable durability to that of OSB/3 to BS EN 300 : 2006, therefore, provided the installation remains weathertight and damp-proof; a life of at least 60 years may be expected. The long life expectancy of our product will reduce energy consumption of a building over its’ lifespan.

What is a BBA Certificate?

Resistance to Solvents, Fungi and Rodents

The rigid urethane 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 with Hemsec by SBUK Building System.

Hemsec Building System components, which have been in contact with harsh solvents, petrol, mineral oil or acids, or components that have been damaged in any way should not be used.

The rigid urethane insulation core and facings used in the manufacture of Hemsec by SBUK SIP panels resist attack by mould and microbial growth and do not provide any food value to vermin.

Strength & Stability

The permissible vertical load resistance for Hemsec by SBUK SIP panels is sufficient for the System’s use as loadbearing partitions, separating walls, the inner leaf of external walls and pitched roofs in dwellings up to four storeys high.


Resistance to Airborne Sound

Weighted apparent sound reduction index for separating walls achieves a sound reduction of (Rw) of 44 dB

Weighted apparent sound reduction index for all other walls achieves a sound reduction of (Rw) of 37 dB

Fire Performance

Panel Internal and External OSB and CPB facings have Class 3 surface spread of flame to BS476: Part 7:
1987. When Hemsec SIPs are used as part of a through-wall build up they pass the requirements of BS476 Part
21 fire resistance of load bearing walls and have achieved up to 75 minutes fire rating. Non-Load bearing walls
can achieve up to a 90 minute fire rating (BS476 Part 22:1987).