General Questions
What products does NRI STEEL manufacture and supply?
NRI STEEL is your premier one-stop shop and integrated manufacturer for complete building, structural, and perimeter security solutions. We specialize in high-grade metal roofing sheets (mabati), structural steel, security fencing, and civil wire products:
- Roofing & Cladding Systems: Box Profile (IT5/Trapezoidal), Corrugated (S-Curve), Roman Tile, Euro Tile, Versatile Tile, Brick Tile, and custom architectural flashings.
- Perimeter Security & Fence Systems: High-tensile Barbed Wire, Concertina Razor Wire, Chain Link Mesh (Galvanized & PVC-Coated), 358 Anti-Climb Mesh, Welded Mesh Panels, and Temporary Fencing.
- Civil & Construction Wire Products: Woven Gabion Baskets & Mattresses, Concrete Reinforcement BRC Welded Mesh, and Black Annealed Binding Wire.
- Structural Steel & Hardware: Cut & Bend Steel Bars, MS Flat Bars, Post Brackets, Clamps, and Fasteners.
Where is NRI STEEL located, and what regions do you serve?
Our manufacturing plants and central distribution hubs are strategically located in Nairobi, Kenya, allowing us to serve domestic infrastructure, commercial, and residential markets nationwide with free delivery countrywide, as well as export across the broader East African region.
Does NRI STEEL cater to both retail homeowners and large commercial B2B projects?
Yes. As a one-stop shop, we supply direct-to-site orders for individual residential builds as well as bulk procurement orders for large-scale commercial developments, civil infrastructure works, government tenders, and hardware distribution networks.
Products & Applications
What are the main differences between Box Profile, Corrugated, and Tile roofing sheets?
- Box Profile (IT5 / Trapezoidal): Features deep trapezoidal ribs that maximize structural rigidity and water discharge capacity. Best suited for low-slope roofs (minimum 10° pitch), commercial warehouses, and modern residential homes.
- Corrugated Profile (S-Curve): Features continuous sinusoidal waves that distribute weight evenly. Highly flexible and cost-effective for standard residential roofs, outbuildings, and temporary site hoardings.
- Tile Profiles (Roman, Euro, Versatile, Brick Tile): Pressed steel sheets engineered to imitate classic ceramic or clay roof tiles. Delivers premium architectural aesthetics while remaining lightweight and leak-proof.
What wire products are best suited for high-security boundary protection?
For maximum intrusion resistance, we recommend a layered combination:
- Concertina Razor Wire (CBT-65 or BTO-22): Mounted on wall crowns or Y-shaped posts to prevent climbing or cutting.
- 358 Anti-Climb Mesh: A high-security welded grid (76.2 mm × 12.7 mm aperture) that prevents finger/toe holds and resists bolt cutters.
- High-Tensile Barbed Wire: Installed as a top-wire extension on chain link or perimeter walls.
When should I use PVC-Coated Chain Link instead of Galvanized Chain Link?
- Standard Hot-Dipped Galvanized Chain Link: Ideal for inland agricultural boundaries, standard residential plots, and light commercial fencing.
- PVC-Coated Chain Link: Recommended for high-moisture environments, coastal regions (saline air), sports courts, and premium landscaping projects. The outer UV-stabilized PVC layer shields the inner galvanized steel core from rust and chemical degradation.
Materials & Specifications
How does steel gauge work for roofing sheets?
Steel gauge uses an inverse scale—a lower numerical gauge indicates a thicker, stronger steel sheet:
Steel Gauge | Nominal Thickness (BMT) | Primary Recommended Application |
Gauge 26 | ~0.40 mm | Commercial godowns, coastal regions, heavy-wind areas, premium long-span roofs |
Gauge 28 | ~0.32 mm | Standard residential housing, institutional buildings, light commercial roofing |
Gauge 30 | ~0.25 mm | Light residential roofing, site hoardings, agricultural sheds, budget partitions |
What is the difference between Base Metal Thickness (BMT) and Total Coated Thickness (TCT)?
- Base Metal Thickness (BMT): The physical thickness of the bare steel core before applying metallic coatings or paint primers.
- Total Coated Thickness (TCT): The final measured thickness including the steel core, metallic protective substrate (Alu-Zinc or Zinc), primer, and topcoat finish.
NRI STEEL Commitment: We always declare exact BMT and TCT specifications to ensure complete transparency on material thickness.
What wire gauges and mesh apertures are available for wire products?
- Chain Link Mesh: Wire diameters range from 2.0 mm (14G) to 3.76 mm (10G) with mesh apertures of 50 mm × 50 mm (2″ × 2″) or 75 mm × 75 mm (3″ × 3″).
- Gabion Baskets: Heavy-duty hexagonal wire weave with a core mesh diameter of 2.7 mm – 3.0 mm and heavy selvedge edge wires of 3.4 mm – 4.0 mm.
- BRC Concrete Mesh: Structural reference sizes ranging from A98 (5.0 mm wire) up to A252 (8.0 mm wire) set in a 200 mm × 200 mm grid matrix.
Manufacturing & Quality
What quality control protocols does NRI STEEL enforce?
Every manufacturing batch undergoes a strict multi-tier quality check:
- Coil & Wire Inspection: Verification of tensile strength, raw material chemical composition, and micrometer core gauge checks.
- In-Line Roll Forming & Weaving Monitoring: Continuous monitoring of profile depth, seam alignment, and weld integrity.
- Coating & Finish Checks: Dry film thickness (DFT) testing for paint coats and adhesion impact testing.
How does NRI STEEL resolve batch quality disputes?
We maintain complete material lot traceability via eTIMS documentation and mill test certificates. In the event of a quality verification request, our technical team conducts on-site micrometer, gauge, and spectrometer testing to verify material parameters against supply specifications.
Installation & Maintenance
What accessories are required for a leak-proof roof installation?
A complete roofing assembly requires matching accessories:
- Ridge Caps (Roll-Top or V-Profile): Seals the apex where opposing slopes meet.
- Valley Gutters: Channels heavy rainfall away from intersecting roof slopes.
- Barge Board / Verge Flashing: Seals side edges against wind uplift.
- Self-Drilling Tek Screws with EPDM Washers: Fastens sheets to timber or steel purlins while creating a watertight compression seal.
What are the installation requirements for Gabion Baskets in civil works?
Gabion baskets must be assembled on a level, compacted surface, wired securely at all selvedge edges using binding wire, and filled with clean, durable hard rock (100 mm to 250 mm size). Internal tie wires should be placed at every 300 mm vertical lift to prevent bulging.
Ordering & Logistics
Can NRI STEEL cut roofing sheets to custom lengths?
Yes. We custom roll-form roofing sheets to your exact length specifications (e.g., from 2.0 meters up to 12.0 meters), reducing material waste and eliminating unnecessary mid-span lap joints.
What are the ordering terms and delivery capabilities?
- FREE DELIVERY COUNTRYWIDE: We offer free, fast delivery countrywide across Kenya directly to your construction site, residential build, or hardware store.
- Lead Times: Standard profiles and wire rolls are dispatched within 24–48 hours. Custom orders depend on volume specifications.
- Regional Shipping: CIF/FOB shipping terms are available for regional export through Mombasa Port.
- Payment Plans (Lipa Pole Pole): Flexible instalment purchasing plans are available, allowing clients to lock in factory prices and receive delivery upon final payment completion.
Technical & Design
What is the minimum recommended roof pitch for NRI STEEL profiles?
- Box Profile (IT5): Minimum 10° pitch.
- Corrugated Profile: Minimum 12° pitch.
- Tile Profiles (Roman, Euro, Versatile): Minimum 15° pitch.
How do I calculate material quantities for my project?
- Roofing Sheets: Divide the total horizontal roof length by the profile’s Effective Cover Width (e.g., ~0.88m for Box Profile) and round up to the next full sheet.
- Chain Link / Razor Wire: Total perimeter linear meters divided by individual roll lengths (typically 18m or 25m for chain link; 10m effective stretch per razor wire coil).
Standards & Certifications
Do NRI STEEL products conform to international building codes?
Yes. Our manufacturing processes and structural specifications align with:
- ASTM Standards: ASTM A792 (Alu-Zinc Coated Sheet), ASTM A641 (Galvanized Carbon Steel Wire), ASTM F668 (PVC Coated Chain Link).
- EN / BS Standards: BS EN 10244-2 (Steel Wire Coatings), BS 1722 (Fencing Specifications).
- KEBS Standards: KS EAS 11 Quality Guidelines.
Sustainability & ESG
Are NRI STEEL products environmentally friendly?
- 100% Recyclable: Steel is fully recyclable without degradation of structural properties.
- Solar Heat Reflectivity: Our 55% Alu-Zinc and Matte paint coats reflect thermal radiation, lowering interior building temperatures and reducing air conditioning energy demands.
- Minimal Material Waste: Custom roll-cutting and precision wire weaving reduce site scrap and carbon footprint during transport.
Surface Treatments & Coatings
What protective coating technologies does NRI STEEL use?
- 55% Alu-Zinc Alloy Substrate (AZ100 / AZ150): A protective hot-dip alloy composed of ~55% Aluminum, 43.4% Zinc, and 1.6% Silicon. Provides up to 4 times greater corrosion resistance than standard galvanized iron.
- Matte / Wrinkle (Textured) Finish: A micro-textured polyester topcoat that diffuses direct sunlight to eliminate harsh glare and offers enhanced scratch resistance during transport and handling.
- High-Gloss Finish: A vibrant, smooth finish that allows rainwater to clean away surface dust and organic debris naturally.
- Hot-Dip Galvanizing (Heavy Zinc): Applied to wire products to deliver long-term protection against ground moisture and weathering.
What is the expected lifespan of NRI STEEL protective coatings?
Coating Type | Mild Inland Environment | Moderate Urban/Suburban | Harsh Coastal/Industrial |
55% Alu-Zinc Pre-Painted Roofing | 30 – 50 Years | 20 – 35 Years | 15 – 25 Years |
Heavy Hot-Dip Galvanized Wire | 25 – 40 Years | 15 – 25 Years | 10 – 15 Years |
PVC-Coated Galvanized Wire | 30 – 40 Years | 20 – 30 Years | 15 – 20 Years |