RoofDek D200 Roof Decking for Maximum-Span Applications
The flagship of the RoofDek portfolio, the D200 is the deepest and longest-spanning roof decking profile available. Designed for the most demanding structural applications, it delivers spans up to 10.00 metres using S320 high-strength steel with a 750mm Cover Width.
Available in solid and web perforated versions. This long-span roof decking system is engineered for major distribution centres, aircraft hangars, manufacturing plants, and other large-scale structures requiring maximum structural performance.
RoofDek D200 prices start from £31/m² (supply only), depending on specification, gauge, and order volume with UK-wide delivery and fast turnaround available.
Typical Applications
The D200 is a structural roof decking solution suited to large-scale industrial and commercial applications:
Large Distribution Centres
Amazon-scale operations requiring maximum clear span and structural capacity.
Aircraft Hangars
Long-span roofing for heavy-duty aerospace and aviation facilities.
Manufacturing Plants
Industrial facilities with demanding load-bearing and long-span requirements.
Intermodal Terminals
Container handling and logistics facilities with exceptional structural needs.
Power Stations & Utilities
Infrastructure requiring heavy-duty, long-span roof support systems.
Exhibition Centres
Large column-free venues for events and public assembly.
Why This System Is Used
- Deepest roof decking profile in the RoofDek range- 205mm actual depth provides maximum structural capacity.
- Longest span capability – up to 10.00 metres in solid version, the maximum in the entire portfolio.
- Exceptional moment capacity up to 45.53 kNm/m at 1.50mm gauge.
- Superior moment of inertia – up to 1670.84 cm⁴/m, the highest in the range.
- S320 steel only – purely structural, heavyweight-grade material for demanding applications.
- Wide 375mm pitch – maximizes efficiency and reduces intermediate support requirements.
- Perforated option with P3L-5 pattern – lowest open area (5% soffit / 10% cover area) in the range for acoustic control while maintaining structural integrity.
Key Technical Features
Depth & Dimensions
Actual Depth: 205mm
Cover Width: 750mm
Pitch: 375mm
Trough: 75mm
Narrow Flange: 205mm
Bearing: 100mm
Material & Gauges
Steel Grade: S320 ONLY
Available Gauges:
• 0.88mm
• 1.25mm
• 1.50mm
No Aluminium Option
Deflection Limits
Imposed Load: Span/200
Suction Load: Span/150
Span Range (Solid): 7.00m to 10.00m
Span Range (Perforated): 5.00m to 8.00m
Perforated Option
Pattern: P3L-5 (23.5%)
Hole Size: 3.0mm
Centre Spacing: 5.5mm square centres
Open Area: 5% soffit / 10% cover area (lowest in range)
Solid D200 Section Properties
Properties based on 100mm bearing. S320 steel grade. Actual depth 205mm.
| Gauge & Steel Grade | Weight (kg/m²) |
Area (cm²/m) |
Moment Capacity (kNm/m) |
I (Trough) (cm⁴/m) |
Z (Trough) (cm³/m) |
I (Narrow Flange) (cm⁴/m) |
Z (Flange) (cm³/m) |
ry (cm) |
Cw (cm⁶/m) |
|---|---|---|---|---|---|---|---|---|---|
| 0.88mm Steel S320 | 0.84 | 13.81 | 21.24 | 830.30 | 20.23 | 960.89 | 26.52 | 6.41 | 58.54 |
| 1.25mm Steel S320 | 1.21 | 19.65 | 35.37 | 1245.21 | 32.14 | 1385.43 | 54.55 | 13.85 | 114.89 |
| 1.50mm Steel S320 | 1.46 | 23.59 | 45.53 | 1537.57 | 40.33 | 1670.84 | 78.13 | 20.35 | 163.00 |
D200 Web Perforated Section Properties
Web perforated — pattern P3L-5 (23.5%). 3.0mm holes at 5.5mm square centres.
| Gauge & Steel Grade | Weight (kg/m²) |
Area (cm²/m) |
Moment Capacity (kNm/m) |
I (Trough) (cm⁴/m) |
Z (Trough) (cm³/m) |
I (Narrow Flange) (cm⁴/m) |
Z (Flange) (cm³/m) |
ry (cm) |
Cw (cm⁶/m) |
|---|---|---|---|---|---|---|---|---|---|
| 0.88mm Steel S320 | 0.84 | 13.13 | 19.86 | 824.21 | 17.67 | 951.55 | 17.09 | 4.02 | 39.72 |
| 1.25mm Steel S320 | 1.21 | 18.67 | 34.24 | 1236.08 | 28.79 | 1372.41 | 36.04 | 8.89 | 77.62 |
| 1.50mm Steel S320 | 1.46 | 22.41 | 44.56 | 1526.18 | 36.65 | 1655.14 | 52.07 | 13.17 | 109.89 |
Design & Specification Considerations
- S320 steel grade only – no downgrading to lower steel grades. D200 is purely a structural profile for high-load applications.
- Gauges start at 0.88mm – lighter gauges (0.70mm, 0.75mm) would be insufficient for the 205mm depth and long span capability.
- 1.50mm gauge option is the heaviest available in the RoofDek range at 23.59 kg/m² – suitable for extreme load conditions.
- Wide 375mm pitch reduces the number of runs required per roof area, improving efficiency on ultra-long-span projects.
- 100mm minimum bearing required on all supports.
- Perforated version (P3L-5) has lowest open area (5% soffit / 10% cover area) of any perforated profile in the range — minimum acoustic absorption but maximum retained structural capacity.
- When soffit is exposed and perforated, VCL (vapour control layer) must be positioned underneath the tray.
- Deflection limits: imposed span/200, suction span/150.
Installation Considerations
- D200 is a heavyweight profile – ensure adequate lifting and handling equipment on site for 0.88mm–1.50mm gauges.
- Wide pitch (375mm) allows faster installation across long-span areas, reducing labour time.
- 100mm bearing minimum – design support structure accordingly to accommodate the wide troughs and flanges.
- Solid version recommended for standard industrial roofing. Perforated version reserved for acoustic control in open-plan venues.
- All fastening and secondary systems must be rated for the heavier profile weight and higher load-bearing requirements.
- On perforated trays with exposed soffits, install VCL underneath to prevent moisture ingress.
- Spans up to 10.00m (solid) and 8.00m (perforated) – use intermediate bracing or stiffening as required by structural design.
Common Problems Solved
This roof decking system is designed to overcome key structural challenges in long-span construction:
Long-Span Roofing
Eliminates the need for intermediate columns and walls, creating unobstructed clear spans up to 10.00 metres.
High Structural Loading
Exceptional moment capacity (up to 45.53 kNm/m) handles heavy point loads, equipment, and concentrated forces.
Wind & Suction Resistance
High moment of inertia (1670.84 cm⁴/m at 1.50mm) provides excellent wind resistance for extreme environments.
Acoustic Control (Perforated)
P3L-5 pattern provides targeted sound absorption in large venues while maintaining maximum structural performance.
Layout Flexibility
Wide 375mm pitch allows flexible roof layouts and simplifies integration with structural grids and building systems.
Cost Efficiency
Maximises span with minimal support infrastructure, reducing overall structural frame cost for large buildings.
RMD Profiles Services
Our full range of professional services supports your D200 project from concept to completion.
- Structural design and load calculations for long-span applications.
- Supply Only with support.
- Supply and Design layout drawings
- Supply and Fix for complete roof solution
- Installation technical support.
- On-site assistance and problem-solving.
Frequently Asked Questions
What is the maximum span for D200?
The D200 solid version spans up to 10.00 metres, the longest span available in the entire RoofDek product range. The perforated version spans up to 8.00 metres.
Why is D200 only available in S320 steel?
D200 is a purely structural profile designed for the most demanding heavyweight applications. S320 is the minimum steel grade required to achieve the exceptional load-bearing capacity and moment capacity (up to 45.53 kNm/m) needed for long-span roofing of distribution centres, aircraft hangars, and power stations.
Is D200 available in aluminium?
No. D200 is a steel-only profile. The structural demands of long-span applications (up to 10.00 metres) require the strength and rigidity of S320 steel. Aluminium would not provide adequate structural performance for these applications.
What is the actual depth of D200?
The actual depth is 205mm. The profile is called “D200” as industry shorthand, but the true depth is 205mm. This is the deepest profile in the RoofDek portfolio.
What perforation pattern does D200 use?
D200 perforated uses the P3L-5 pattern (23.5%) with 3.0mm holes at 5.5mm square centres. This pattern provides the lowest open area (5% soffit / 10% cover area) of any perforated profile in the range, meaning maximum retention of structural capacity with targeted acoustic control.
D200 vs D159 – when to choose which?
Choose D200 for maximum span (up to 10.00m solid), maximum structural capacity, and the heaviest loading conditions. The D200 has superior moment capacity (45.53 kNm/m at 1.50mm vs lower values for other profiles) and moment of inertia (1670.84 cm⁴/m). Choose D159 or other profiles for shorter spans, lighter loads, or where depth is constrained. Consult our technical team for your specific project requirements.
What is the heaviest gauge available?
The 1.50mm gauge is the heaviest available in the RoofDek range at 23.59 kg/m². This gauge delivers the maximum moment capacity (45.53 kNm/m) and moment of inertia (1670.84 cm⁴/m narrow flange) for the most extreme structural demands.
How Does RoofDek D200 Compare to Other Roof Decking Profiles?
The RoofDek range includes multiple structural roof decking profiles designed for different span requirements, load conditions, and project types. Choosing the right system depends on span length, structural performance, and installation efficiency.
Long-Span Roof Decking (5.0m+ spans)
For projects requiring maximum clear spans and minimal structural support, deeper profiles like RoofDek D153 and RoofDek D200 are the preferred solutions.
- D200 offers the highest span capability (up to 10.0m) and maximum load performance
- D153 provides a balance of long-span capability and material efficiency
👉 Explore:
Mid-Span Roof Decking (3.0m–6.0m spans)
For standard commercial and industrial buildings, mid-range profiles such as RoofDek D100 and RoofDek D60 provide strong structural performance with improved material efficiency and wider cover widths.
These systems are typically used where extreme spans are not required but load capacity remains important.
👉 Explore:
Shallow / Short-Span Roof Decking (Up to ~4.0m spans)
Shallower profiles like RoofDek D32S are ideal for shorter spans, tighter structural grids, or projects prioritising cost efficiency and speed of installation.
These profiles are commonly used in smaller commercial buildings and secondary structures.
👉 Explore:
If you’re unsure which roof decking system is right for your project, our team can advise based on span requirements, loading conditions, and build efficiency.
Ready for Maximum-Span Structural Roofing?
The D200 is engineered for the most demanding applications. Speak with our technical team to confirm suitability, discuss gauges and specifications, and request a quote for your project.
