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Steico Universal 1

Steico Universal Wood Fibre Insulation Sarking & Sheathing Board

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Please Note this stock item requires an oversize pallet to transport so is not available to buy online. Please call us for carriage rates.  To order please call 01793 847 444 or email

Steico Universal sheathing board for is for both pitched roof and wall construction.  The board is made from natural wood fibres.  Steico Universal is designed for sheathing timber frame wall panels with stud framing not less than 38 mm in width and at maximum 600mm centres. The boards can resist weather exposure without deterioration during construction or if cladding is delayed.

U value 0.48W/m2K - Density 270Kg/m3

  • High compressive strength
  • High heat protection during summer months
  • Excellent insulation qualities, prevents thermal bridging
  • Water vapour open, suitable for warm roofs
  • Water resistant due to special rebate on roof pitches ≥ 18°
  • May be fully exposed for up to four weeks in a temporary condition
  • Effective protection against wind, dust, moisture and sound
  • Enhanced vapour transfer
  • Contributes to an excellent room climate
  • Ecologically  and environmentally friendly, recyclable
  • Made of wood fibres, FSC® chain of custody certified

Board measures 2500mm x 600mm each board covers circa 1.4m2

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Steico Universal is an external insulation sarking & sheathing board made from natural wood fibre sourced from sustainable forests.

A sarking and sheathing board made of natural wood fibre for any roof or wall construction. These external insulation panels can be used as a sheathing board for pitched roofs and timber framed walls. This thermal insulation can resist weather exposure without deterioration during construction or should the final finish be delayed.

Steico Universal wood fibre boards are available in the following sizes. 

Thickness mm

Dimensions mm

Working Coverage m2

Weight per sheet kg

Maximum sheets per Pallet


2500 x 600





2500 x 600





2500 x 600





  • Steico Universal wood fibre sarking board has high compression strength
  • Steico Universal external insulation board gives high heat protection during summer months - see digram below
  • These insulation panels prevent thermal bridging
  • This sheet insulation is water vapour open and is suitable for warm roofs
  • When Steico Universal is used as a roof insulation board on roof pitches ≥ 18°, then it is water resistant due to the T&G profile
  • Steico Universal boards may be fully exposed for up to four weeks in a temporary condition during insulation installation
  • They are effective protection against wind, dust, moisture, and sound
  • Steico Universal board allows enhanced vapour transfer
  • Steico Universal insulation boards contribute to an excellent room climate
  • Steico Universal is an eco-friendly insulation board made from natural wood fibres
  • Steico Universal board is sourced from sustainable forests & is FSC® chain of custody certified and recyclable at the end of its life time 
  • CE marked

 Steico Universal can also be used for

  • external insulation for roofs or floors with staggered joints or under sarking membrane.
  • weathering protection
  • water resistance.
  • interior insulation for floors or roofs,
  • insulation between rafters.
  • external insulation for walls behind a suitable facade.
  • insulation for timber structures.


Steico Universal wood fibre insulation sarking board is produced in accordance with EN 13171 and EN 13986 with and with ongoing quality supervision. The wood comes solely from sustainably cultivated forests

Produced and supervised according to EN 13171 and EN 13986

Board designation

WF – EN 13171 – T4 – DS (70,-) 2 – CS (10 \ Y)100 – TR30 – WS1,0 – AF100; EN 622-4 – SB.H – E1

Edge design

Special tongue and groove profiles

Fire class according to EN 13501-1


Declared thermal conductivity λD [ W / ( m*K )]


Declared thermal resistance

0,45 (22) / 0,50 (24) 0,70 (35) / 1,05 (52) 1,25 (60)

Density [kg / m3]


Water vapour diffusion resistance factor μ


Sd value [m]

0,11 (22) / 0,12 (24) / 0,18 (35) / 0,26(52)/ 0,30 (60)

Short-term water absorption [kg / m2]

≤ 1,0

Specific heat capacity [J / (kg*K)]


Compression strength at10% deformation σ10 [N / mm2]


Compression strength [kPa]


Tensile strength perpendicular to face ^ [kPa]

≥ 30

Declared level of airflow resistance [( kPa*s ) / m2]

≥ 100

Raw material – natural resin

wood fibre, aluminium sulphate, paraffin,bond between layers

Waste code (EAK)

030105 / 170201

Performance configurations for maximum phase shift - with U values

Steico rigid wood fibre roof phase shift and U value

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