STS Construction Board 6mm, 9mm & 12mm

STS Construction Board 6mm, 9mm & 12mm

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Suitable for internal and external use. Impervious to moisture and A1 Fire Rated. The STS Construction Boards have numerous applications including over boarding timber floors prior to tiling as well as cavity closure, eaves boards, under canopies, or as a ceiling board where fire rating is required. The A1 fire resistant board means that your structure will be safer in the event of a fire outbreak.

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Key Areas of Use:

  • Internal Ceiling Board (suitable to apply plaster)
  • Loft Conversions
  • Garages
  • Car Ports
  • Mezzanines
  • Student Accommodation/Multi Occupancy (MO) Buildings
  • Balconies & Walkways
  • Grain Store (Volatile Storage Areas)
  • Fire Break Above Suspended Ceilings
  • Underground Carpark/Storage

Features:

  • Euro Class A1 Fire Rating (BS EN 12467)
  • Impact Resistant
  • High Density
  • Weatherproof & Water Resistant
  • External Heavy-Duty
  • Maintains Minimum Board Movement
  • Plaster Ready (Prime with SBR)

Standard Board Sizes:

  • 2400mmx1200mm (6mm*, 9mm & 12mm)
  • 1200mmx800mm (9mm & 12mm)
  • 1200mmx600mm (6mm*)

*Whilst all our boards are suitable for use on ceilings, for added rigidity and strength, we would recommend 9mm or 12mm where possible.


Suitable For:

  • Timber Frame
  • Lightweight Steel Frame
  • Offsite/Modular Build
  • All Internal

Cutting Guide:

Due to the density of the boards, we recommend using a STS PCD Blade (poly crystalline diamond) which are designed for use on fibre cement. They have 5 or 6 diamond tipped teeth which reduce dust and keep the blade cool resulting in it lasting much longer and getting a clean cut finish.



Handling Tip for Ceilings:

Best practice for offering these boards into position for ceilings would be the use of an electric or manual panel lifter. This makes it much easier to adjust the position and hold in place while fixing and can be purchased or hired from most tool hire outlets.

STS Construction Board - 6mm




STS Construction Board - 9mm




STS Construction Board - 12mm


6mm, 9mm and 12mm Construction Board


5006 2400x1200x6mm 70
5509 1200x800x9mm 70
5009 1200x2400x9mm 40
5512 1200x800x12mm 75
5524 1200x2400x12mm 35
Board Dimensions & Weight 1200mmx600mm - 6.25kg
2400mmx1200mm - 28kg
1200mmx800mm - 12.8kgkg
2400mmx1200mm - 39.5kg
1200mmx800mm - 15.2kg
2400mmx1200mm - 45kg
Tolerance 0.2%
Test Standard BS EN 12467:2016 + A1:2016 BS EN 12467:2016 + A1:2016 BS EN 12467:2016 + A1:2016


Density 1.28g cm3 1.28g cm3 1.28g cm3
Linear Variation (change in moisture) 0.16% 0.16% 0.16%
Bending Strength (dry) 17.56 MPa 17.27 MPa 12.46 MPa
Bending Strength (saturated in warm water) 12.97 MPa 14.93 MPa 12.91 MPa
Water Impermeability (unprimed) No water formation after 24 hours
Damp patch covers tested area
No water formation after 24 hours
Damp patch covers tested area
No water formation after 24 hours
Damp patch covers tested area
Water Impermeability (unprimed) No water formation after 24 hours
No damp patch in tested area after 192 hours
No water formation after 24 hours
No damp patch in tested area after 192 hours
No water formation after 24 hours
No damp patch in tested area after 192 hours
Reaction to Fire EuroClass A1
Non-Combustible (A1fl)
EuroClass A1
Non-Combustible (A1fl)
EuroClass A1
Non-Combustible (A1fl)
Test Standard EN ISO 1182 & EN ISO 1716 EN ISO 1182 & EN ISO 1716 EN ISO 1182 & EN ISO 1716
Fire Insulation BS 476 part 22
118 min burn time for timber frame party wall
Mechanical Characteristics - Bending Strength (MOR) Class 2 Class 2
Durability: Freeze-Thaw Complied Complied
Durability: Heat-Rain Passed Passed
Durability: Warm Water Complied Complied
Durability: Soak-Dry Complied Complied
Test Standard EN ISO 1182 & EN ISO 1716 EN ISO 1182 & EN ISO 1716 EN ISO 1182 & EN ISO 1716
Pull through testing Mean result: 1650 Newtons
Pull out testing Mean result: 840 Newtons
Module of rupture (Dried Conditioning) 13:13 MPa
Thermal Conductivity ≤0.35W/ (m.k) ≤0.35W/ (m.k) ≤0.25W/ (m.k)
Density 1.35g/cm3 1.35g/cm3 1.23g/cm3
Compressive Strength 16.1Mpa (Air Condition), 20.3Mpa (Dry Condition) 16.3Mpa (Air Condition), 20.5Mpa (Dry Condition) 11.2Mpa (Air Condition), 13.5Mpa (Dry Condition)

Yes, STS 12mm Construction Boards have far superior properties in comparison with plasterboard such as fire resistance, impact resistance, strength, breathability, durability to damp and excellent thermal mass properties.

Yes. Before applying plaster, STS 12mm Construction Boards require priming with SBR Primer.

For standard internal use onto timber or metal stud work, use STS 38mm torx screws to fix 12mm boards, 400mm centres. For external, fire and render applications, fixing methods vary by application. Please call our technical support line for best practice.

We recommend either using our Fibre Cement Scoring Tool or a PCD cutting blade which fits into a hand held circular saw. Dust extraction is recommended for this.

Portland Cement: binds the ingredients and is made with limestone, clay and iron. Cellulose Fibres: treated, organic fibres which act as a filler. Sand: highly durable and creates all weather performance. Water: dissolves the wood pulp; activates and hardens the cement. STS Construction Boards have no need of fibreglass mesh for strengthening, which of course is almost impossible to recycle and very irritable when cutting.

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