Description
Use the STS NoMorePly 12mm fibre cement carrier board (1.2 m × 0.8 m) where the full sheet is more material than the area needs — dormer cheeks, window reveals, soffit returns, and small-panel infill on timber-frame and steel-frame facades. At 15.8 kg per board, it ships from our render carrier boards collection as the practical small-format option, manufactured to BS EN 12467:2016 + A1:2016 with the same Class A1 non-combustible classification as the full-size sheet.
Product Overview
The 1200 × 800 × 12 mm carrier board is the small-format render substrate of choice for areas where a 2.4 × 1.2 m sheet would generate excessive cutting waste. Density holds at 1.28 g/cm³ and the EN 12467 mechanical class is identical to the full sheet — what changes is handling. At 15.8 kg, one installer can lift, position, and fix the board single-handed on a scaffold, which matters for reveal panels above first-lift level where two-person handling is awkward.
The 0.96 m² format also matches the typical reveal width on UK domestic openings, so two boards trimmed sympathetically can clad a full reveal-and-soffit run with a single horizontal joint to treat. Linear variation with moisture sits at 0.16% — the same dimensional stability that lets joints stay tight after basecoat application across the larger sheet.
Key Benefits
- Single-person handling at height — 15.8 kg per board lets one installer fix above first-lift scaffolds without a mate.
- Lower cut-waste on small panels — the 0.96 m² format suits dormer cheeks, reveals, and soffits where a full sheet leaves significant off-cuts.
- Class A1 non-combustible — tested under EN 13501-1, EN ISO 1182 and EN ISO 1716, suitable for facades where the project fire strategy specifies non-combustible build-ups.
- Identical mechanical performance to the full sheet — 12.46 MPa dry / 12.91 MPa saturated bending strength means the smaller format carries no specification penalty.
- Render-ready primed face — primed water impermeability shows no damp patch after 192 hours, giving basecoat consistent suction across the panel.
Technical Specifications
| Property | Value |
|---|---|
| Dimensions | 1200 × 800 × 12 mm (thickness tolerance 0.2%) |
| Board weight | 15.8 kg |
| Coverage per board | 0.96 m² |
| Density | 1.28 g/cm³ |
| Bending strength (dry / saturated) | 12.46 MPa / 12.91 MPa |
| Linear variation (moisture) | 0.16% |
| Reaction to fire | Euro Class A1 / A1fl (non-combustible) |
| Water impermeability (primed) | No damp patch after 192 hours |
| Standard | BS EN 12467:2016 + A1:2016 |
Application & Compatibility
The small-format board works best on reveal panels, dormer cheeks, soffit returns, narrow infill strips between openings, and any small detail area on a timber-frame or steel-frame facade. It also serves as the practical board to keep on the van for repair, patch, and remediation work where opening up a full 45 kg sheet would be wasteful. For full-elevation work on a wide unbroken stud bay, the larger 2.4 × 1.2 m render carrier board reduces joint count and the associated mesh-bedding labour.
The cement boards for rendering UK guide covers carrier selection logic, joint treatment with mesh embedment, and primer choice for thin-coat silicone, mineral, and acrylic finish systems.
Installation Notes
Fix with STS 38 mm render board screws at 200 mm centres on board perimeters and 300 mm in the field — roughly 14–18 screws per 0.96 m² panel on stud framing. Drive flush with the face, never countersunk, so the basecoat layer bridges cleanly without dimples telegraphing through the finish coat. Where the carrier sits within an EWI build-up, the assembly may also require EWI mechanical anchors back to the structural wall — confirm the spacing schedule against the system designer's drawing.
For the cleanest joint result, leave a 3–4 mm gap between boards, fill with a flexible cementitious adhesive, and embed reinforcement mesh while the adhesive is still wet. Stagger joints between adjacent rows so no four boards meet at a single point — this is where reflective cracking concentrates if joints align.
Trade Insight
The 1.2 × 0.8 m format earns its place on the van when the schedule mixes full elevations with detail work. A typical pattern: order full sheets for the main wall areas, the half-size board for reveals, dormers, and any odd geometry. The smaller format also tolerates a less precise cutting schedule — when the running area changes shape, a 15.8 kg board reads the wall faster than dragging a 45 kg sheet across a tight scaffold. The published bending values are identical, so the specification narrative on a project's compliance dossier reads the same regardless of which format covers each area.
Is This Product Right for Your Project?
- Reveals, dormers, and soffit returns: ideal — the small format minimises off-cut waste on detail areas.
- Full elevations with continuous stud bays: consider the larger 2.4 × 1.2 m carrier board — fewer joints, faster basecoat reinforcement.
- Single-installer access at height: well suited — 15.8 kg per board supports one-person handling above first-lift level.
- EWI on solid masonry walls: a carrier board is rarely needed — render directly onto basecoated insulation in most cases.
Frequently Asked Questions
How does this differ from the 2.4 × 1.2 m board?
Mechanical performance, fire classification, and dimensional stability are identical — both follow the same TDS data. The difference is format: 0.96 m² coverage at 15.8 kg suits small-panel and reveal work, while the larger sheet covers 2.88 m² with fewer joints on continuous wall runs.
Can one person handle the board on scaffold?
Yes. At 15.8 kg, the board is within comfortable single-person handling limits at height, which is the main practical reason installers choose this format for above-first-lift detail work.
What render systems can be applied to this board?
Thin-coat silicone, mineral, and acrylic systems are all compatible once the board face is primed with a quartz primer. Joints must be taped and basecoated with reinforcement mesh embedded across every joint. The cement board rendering guide walks through the full sequence.
How many screws per board?
Around 14–18 screws per 0.96 m² panel on stud framing — 200 mm centres on perimeters, 300 mm in the field. Always cross-reference the system designer's spacing schedule for the specific facade build-up.
Technical Documentation