SR100+ Sinusoidal Roofing Sheet
Deep sinusoidal profile for industrial, commercial and distribution roof systems. Cover width 720mm, 100mm depth, engineered for spans up to 6.2m with proven load performance across three steel gauges.
Available in galvanised and polyester white finishes. Supplied to BS EN 10346:2015. Complies with BS 5427:2019 for material and BS 476 Pt7 for fire performance (Class 1).
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Typical Applications
Industrial Facilities
Manufacturing plants, warehouses, factory units and production halls where long span capability and structural stiffness are essential.
Commercial Buildings
Retail parks, office canopies and extension roofing where weather tightness, structural performance and a clean finish are all required.
Distribution and Logistics
Large span sheds, storage facilities and consolidation centres requiring rapid installation and cost effective roofing over wide purlin spacings.
Plant Room Enclosures
Covered plant areas including pump houses, boiler rooms and external equipment shelters with robust weather protection over wider spans.
Roof Refurbishment
Re-roofing existing industrial and commercial structures where the 100mm depth provides additional stiffness over deteriorated substrates.
Why This System Is Used
Deep sinusoidal profile: The 100mm depth provides significantly greater structural stiffness than shallower sinusoidal sheets, allowing wider purlin spacings and longer spans. The 240mm pitch and curved crowns (101mm radius) and valleys (70mm radius) deliver both load capacity and effective water shedding.
Long span capability: SR100+ achieves spans from 3.0m to 6.2m depending on gauge and load case, significantly reducing the need for intermediate supports and lowering support frame costs on large roof areas.
Material choice: Available in three gauges (0.7, 0.9, 1.2mm) from a single production line. Steel grade S350 to BS EN 10143:2016 ensures consistent mechanical properties. Galvanised (Z275) and polyester white (Z150 + 25μm) coatings provide durability in exposed environments.
Fire compliance: Class 1 (BS 476 Pt7) and Class 0 surface rating where specified, supporting building regulations for medium to high risk properties.
Key Technical Features
Cover Width and Pitch
720mm cover width; 240mm pitch. Sinusoidal crown and valley geometry with 101mm and 70mm radii respectively.
Steel Grade and Thickness
S350 (BS EN 10143:2016, BS EN 10346:2015) in 0.7, 0.9, 1.2mm gauges. Maximum sheet length 12m.
Coatings
Galvanised Z275 (275g/m²) or Polyester White (150g/m² Z150 base + 25μm polyester topcoat).
Fire Performance
Class 1 (BS 476 Pt7); Class 0 surface rating available. Complies with BS 5427:2019.
Span Capability
3.0m to 6.2m depending on gauge, load case and deflection criteria. Partial safety factor 1.5 applied.
Fixing and Lap Details
Fixed every trough at sheet ends and intermediate supports; 150mm end lap, 450mm side lap and 450mm side support spacing.
Section Properties
| Gauge (mm) | Weight (kg/m²) | Area (mm²/m) | Top Moment of Capacity (kNm/m) | Top Moment of Inertia (cm⁴/m) | Bot Moment of Capacity (kNm/m) | Bot Moment of Inertia (cm⁴/m) |
|---|---|---|---|---|---|---|
| 0.7 | 9.47 | 1146 | 7.46 | 179.06 | 8.41 | 154.0 |
| 0.9 | 12.20 | 1493 | 11.62 | 211.3 | 10.74 | 196.2 |
| 1.2 | 16.29 | 2014 | 21.77 | 349.87 | 17.73 | 351.6 |
Properties based on steel grade S350, BS EN 10143:2016. Calculated in accordance with Eurocode 3. Load tables available on request.
Need detailed load tables for your design?
Design and Specification Considerations
Load Cases and Deflection Criteria
SR100+ is designed and tested to accept both gravity loads (live load plus permanent load) and uplift loads (wind suction). Deflection limits are set at Span/200 for gravity cases and Span/90 for uplift cases, applied with a partial safety factor of 1.5 on material strength.
Bearing requirements are 60mm on supporting frame members. This ensures that concentrated loads at fixing points do not cause crushing or local deformation of the trough. Support frame design should specify adequate stiffness to limit deflection of the primary structure, reducing secondary impacts on the roof sheeting.
Site Conditions and Pitch
SR100+ is suitable for pitches between 5° and 30°, with performance optimised in the 10° to 25° range. At lower pitches (below 8°), sealant may be applied to side lap joints in exposed locations to enhance weather tightness. This is a site decision dependent on local exposure and building orientation.
In areas of severe exposure (coastal, high altitude, industrial pollution), the polyester white finish is recommended over galvanised to provide longer term weather protection. Specify BS EN 10346:2015 Zn/Al alloy coating (Z275 equivalent) for enhanced corrosion resistance if required.
Gauge Selection and Cost Trade Offs
The 0.7mm gauge is cost optimised for standard span applications (3.0m to 4.0m) with conventional live loads. The 0.9mm gauge extends capability to 4.0m to 5.0m and is widely specified in multi span continuous layouts. The 1.2mm gauge is used for long spans (5.0m to 6.2m) or where additional stiffness is required, for example in heavily trafficked plant areas or high snow load regions.
Our technical team can review load cases and recommend gauge to balance specification durability with project budget. Load tables and span charts are provided as part of our supply and design service.
Installation Considerations
Sheet Fixing and Lap Details
Each sheet is fixed to the support frame at every trough at sheet ends. Intermediate fixing is every trough along the length of the sheet. End lap is 150mm, allowing for a single row of fasteners; side lap is 450mm, providing sufficient engagement for wind resistance. Side support members are spaced 450mm apart to ensure lateral stability during installation and service.
Fastening and Tool Hire
Self drilling screws (typically 6.3 x 32mm or 6.3 x 38mm) are standard for both end lap and side lap fixing. A pneumatic or electric fixing tool significantly speeds installation and ensures consistent torque. RMD Profiles offers tool hire for projects requiring faster cycle times or where labour cost saving is a priority.
Handling and Sheet Length
Maximum sheet length is 12m. However, at the longer lengths and heavier gauges, the weight of individual sheets increases significantly (1.2mm gauge at 16.29 kg/m²). Site teams should plan lifting and positioning carefully, particularly for sheets exceeding 6m in length. Mechanical lifting is recommended for all gauges on sheets above 8m.
Safety and Weather Protection
Installation teams should follow standard roof safety practices, including use of harnesses, edge protection and weather monitoring. For projects involving full roof replacement or high risk areas, RMD Profiles supplies and installs proprietary safety netting to protect personnel and prevent debris falling into the building during the works. This is available as a supply only or supply and fix service depending on your requirements.
Inspection and Quality Control
Visual inspection of sheets before fixing should check for transport damage, correct gauge and coating, and that fixing details match the specification drawings. Post installation, all fasteners should be inspected for correct seating and torque. Our technical team can advise on inspection protocols and can arrange site visits for larger projects.
Planning your SR100+ installation?
Common Problems This System Solves
Spanning Large Roof Areas
SR100+ reaches 6.2m spans without intermediate supports, significantly reducing steel frame costs and simplifying installation on broad industrial and commercial structures.
Weather Tightness
Deep 100mm sinusoidal troughs with 101mm crown radius shed water effectively. Side lap detail (450mm) and end lap (150mm) are proven in exposed UK and temperate climates.
Fire and Building Control
Class 1 fire rating and Class 0 surface assessment meet stringent building regulations for medium to high risk commercial and industrial properties.
Wide Purlin Spacings
The 100mm depth and high section properties allow purlin spacings well beyond what shallower profiles can achieve, reducing the total number of purlins and associated steelwork costs.
Installation Speed and Cost
The 720mm cover width combined with long span capability means fewer sheets and fewer support members per roof area, delivering faster installation and lower overall project costs.
Refurbishment and Overlay
SR100+ can be laid over existing flat or damaged roofing without extensive substrate preparation, shortening project timelines and reducing waste removal costs.
RMD Profiles Services
Supply Only
Material supply with telephone and email technical support. Suitable for projects where your design team or main contractor manages specification and installation.
Supply and Design
Our supply and design service includes layout drawings and specification guidance tailored to your project. We review your structural engineer’s loads, recommend gauge and fastening details, and provide setting out drawings for the installation team. This is a charged service and removes uncertainty from the specification process.
Supply and Fix
Full material supply and professional installation. Our certified installation teams follow industry standards and building regulations. We handle all site safety protocols, coordinate with main contractors, and provide snagging and inspection on completion.
Tool Hire
Pneumatic and electric fixing tools available for hire on a daily, weekly or project basis. Tool hire accelerates installation and ensures consistent fastener torque, reducing callbacks for loose screws or weather ingress.
Safety Netting
Temporary safety netting systems for roofing projects where personnel protection or debris containment is required. Supplied and installed to CIRIA guidelines and current safety legislation.
Technical Support
Specification advice, product selection guidance and load table provision. Contact our technical team early in your design process to explore options and confirm suitability for your application.
About SR100+ Sinusoidal Roofing
The SR100+ is a deep sinusoidal metal roofing profile engineered for industrial, commercial and distribution applications across the UK. With a 720mm cover width and 100mm depth, it delivers spans of up to 6.2m whilst maintaining excellent weather tightness and fire performance. Available in three steel gauges (0.7mm, 0.9mm, 1.2mm) and two finish options (galvanised Z275 or polyester white), the SR100+ combines long span performance with cost effectiveness for new builds and refurbishment projects.
Manufactured to BS EN 10346:2015 and compliant with BS 5427:2019 for roof sheeting, SR100+ achieves Class 1 fire rating (BS 476 Pt7) and can be specified for Class 0 surface assessment where building regulations demand enhanced fire safety. The deep sinusoidal profile provides significantly greater structural stiffness than shallower profiles, making it the preferred choice for wide purlin spacings and long span applications where reducing support steelwork is a priority.
RMD Profiles supplies SR100+ across the UK with design and technical support. Whether your project requires material only or a complete design and install solution, our team can advise on gauge selection, span capabilities and installation methodology to meet your budget and programme. Contact us for a quotation or to discuss your roofing specification in detail.
Frequently Asked Questions
What is the maximum span for SR100+ at 0.7mm gauge?
At 0.7mm gauge, SR100+ typically achieves spans of 3.0m to 4.4m depending on applied loads and deflection criteria. The 0.9mm gauge extends this to approximately 5.0m, and 1.2mm reaches up to 6.2m. Exact spans are determined by load case (gravity, wind uplift, snow) and support conditions (single, double or multi span). Request a load table from our technical team to confirm span for your specific project.
How does SR100+ compare to SR60+ for spanning capability?
SR100+ has significantly greater depth (100mm vs 60mm), which delivers higher section properties and longer span capability. Where SR60+ spans up to 5.2m, SR100+ reaches 6.2m. The trade off is a narrower cover width (720mm vs 850mm), so more sheets are needed per metre of roof width. SR100+ is the better choice where span is the priority; SR60+ is more efficient where purlin spacings are moderate.
What is the difference between galvanised and polyester white finishes?
Galvanised (Z275, 275g/m²) is cost effective and provides adequate corrosion protection in most UK environments. Polyester white (150g/m² Z150 base + 25μm topcoat) offers enhanced durability in coastal, industrial or high rainfall areas, with longer service life and better colour retention. For most new builds and refurbishment projects in standard exposure, galvanised is sufficient; polyester is recommended for harsh or exposed locations.
How does RMD Profiles’ supply and design service work?
Our supply and design service includes technical review of your structural loads, gauge recommendation, fixing detail drawing, and setting out layouts for the installation team. This is a charged service that removes guesswork and ensures compliance with building regulations. It is particularly valuable on complex roofs, large areas or where refurbishment requires overlay design. Contact our team to discuss scope and pricing.
Is sealant required on SR100+?
Sealant is not routinely applied on SR100+ unless specified for low pitch or very exposed applications. The deep sinusoidal profile and 450mm side lap provide excellent water shedding in standard UK climates. Sealant application is a site decision based on pitch, exposure and water penetration risk. Our technical team can advise if your project location or pitch warrants sealant.
What are the maximum sheet lengths available?
SR100+ sheets are supplied up to 12m in length. Longer sheets reduce the number of end laps and fastening points, lowering installation labour and material waste. However, at longer lengths the sheet weight increases considerably (particularly at 1.2mm gauge), so mechanical lifting should be planned for sheets exceeding 8m. On projects with roof lengths exceeding 12m, multiple sheets are joined using 150mm end lap detail.
Still have questions about SR100+?
Ready to Specify SR100+ for Your Project?
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RMD Profiles Ltd: Roof metal decking, guttering and building envelope solutions across the UK.
