Steel Exterior Doors
Shaanxi SGL Doors&Windows Technology Co., Ltd. is one of the most reliable manufacturers and suppliers of steel exterior doors in China, also supports customized service. Please feel free to wholesale high quality steel exterior doors for sale here from our factory. If you have any enquiry about pricelist and quotation, please feel free to email us.
Steel Exterior Doors
Steel exterior doors are the first line of defense for any building. They handle weather, security threats, daily wear, and thermal performance requirements simultaneously. Specifying the right exterior door means balancing these competing demands without compromising on any of them.
Product Parameters
| Parameter | Specification |
|---|---|
| Frame material | Galvanized steel, 1.5–2.0mm |
| Steel skin | 0.8–1.2mm galvanized |
| Standard sizes | 900×2100mm, 1000×2100mm, 1200×2100mm |
| Max dimensions | 1500×3000mm (custom engineering) |
| U-value (thermally broken) | 0.8–1.5 W/(m²·K) |
| Wind load resistance | Up to 3.0 kN/m² |
| Water tightness | Class 3–4 per EN 12208 |
| Air permeability | Class 3–4 per EN 12207 |
| Security rating | RC2–RC4 per EN 1627 |
| Fire rating | EI 30–EI 120 available |
| Frame finish | Powder coat, full RAL range |
| Core insulation | Mineral wool or PU foam |
Why Steel for Exterior Applications
Steel outperforms wood and fiberglass in three areas that matter for exterior doors: dimensional stability, security, and lifecycle cost.
- Dimensional stability. Wood swells with humidity. Fiberglass can warp under UV exposure. Steel, when properly engineered with thermal breaks and insulated cores, maintains its shape across temperature and humidity cycles. This prevents the seal failures that lead to drafts and water infiltration.
- Security. Steel skins, when properly gauged and framed, resist forced entry better than any other common door material. Combined with multi-point locking and reinforced frames, steel exterior doors provide measurable security performance.
- Lifecycle cost. A quality steel exterior door lasts 30+ years with basic maintenance. Wood doors typically need refinishing every 5–10 years. Fiberglass performs well but costs more than steel for comparable security performance.
Prehung vs. Slab Doors
One of the first specification decisions: prehung or slab.
- Prehung steel exterior doors come with the door leaf pre-installed in the frame, with hinges and strike plates already aligned. For export projects, we typically supply prehung units because they reduce on-site installation errors. The frame, anchors, and seals are all pre-engineered for the specific wall construction type.
- Slab doors (door leaf only) are sometimes specified when the frame is being reused or when local installers prefer to fit hinges on-site. This requires precise rough opening measurements and experienced installers.
- For most B2B projects-residential developments, commercial buildings-we recommend prehung units. The slightly higher shipping volume is offset by reduced installation time and fewer callbacks.
Installation Considerations
Proper installation determines whether the door performs as specified.
- Rough opening tolerance. Steel frames require precise rough openings. We recommend ±5mm tolerance for standard installations. Larger tolerances require shimming and additional sealing.
- Anchoring. Frame anchoring must transfer the door's operational loads to the surrounding structure. For masonry, we specify expansion anchors at maximum 300mm centers. For steel stud construction, the frame ties into structural studs.
- Sealing. Perimeter seals prevent air and water infiltration. We provide detailed sealing specifications with every order, including compatible sealant types and application methods.
- Commissioning. After installation, the door should be tested for operation, alignment, and seal integrity. We provide commissioning checklists for installers.
Project Example: Residential Development in Almaty
A 120-unit residential development in Almaty specified steel exterior doors for all apartment entrances. Requirements included: EI 60 fire rating, RC3 security rating, and U-value ≤ 1.5 W/(m²·K).
Solution:
- Thermally broken steel frames with mineral wool core
- Four-point locking system
- Double-seal perimeter gaskets
- RAL 9005 black fine texture finish
- Prehung units for faster on-site installation
The developer reported zero door-related callbacks in the first 18 months. The property management team noted that the doors showed no signs of wear despite high traffic and Almaty's temperature swings (-30°C to +35°C).
Maintenance Requirements
Steel exterior doors are low-maintenance but not zero-maintenance.
- Annual checks: Inspect perimeter seals for compression set. Check hardware alignment. Verify that drainage channels are clear.
- Surface maintenance: Wash with mild detergent. Do not use abrasive cleaners on powder-coated surfaces. Touch up any coating damage promptly to prevent corrosion.
- Hardware lubrication: Hinges and locks should be lubricated annually with appropriate products. We specify lubricants compatible with the hardware and the door's operating environment.
- Gasket replacement: Perimeter gaskets typically last 10–15 years. Replacement is straightforward if the door was specified with accessible gasket channels.
Product Application
Our factory
Customer visit
FAQ
Q: What's the difference between steel exterior doors and steel entry doors?
A: The terms are often used interchangeably. "Exterior" emphasizes weather resistance and thermal performance. "Entry" emphasizes security and aesthetics. In practice, most steel doors for building entrances address both.
Q: How do prehung steel doors ship?
A: Prehung units ship as assembled door-and-frame assemblies. We crate them for container shipment with protective corner brackets and moisture barriers. For large projects, we coordinate crate sizes with the client's logistics provider.
Q: Can steel exterior doors achieve Passivhaus-level U-values?
A: Yes, with triple-glazed units (if glazed), enhanced thermal break systems, and insulated thresholds. U-values below 0.8 W/(m²·K) are achievable but add significant cost. For most projects, 1.0–1.5 W/(m²·K) provides the best cost-performance balance.
Q: What fire ratings are available?
A: EI 30, EI 60, EI 90, and EI 120 are standard options. The rating required depends on local building codes and the building type. We provide certified test reports for all fire-rated doors.
Q: How long does delivery take?
A: Standard sizes: 4–6 weeks from order confirmation. Custom sizes: 6–9 weeks. Fire-rated or certified security doors may require additional time for documentation and certification verification.
Q: Can we get samples before ordering?
A: Yes. We provide sample door leaves (unfinished or finished) for quality evaluation. Sample cost is credited against the first production order.
Q: What warranty do you provide?
A: Standard warranty: 10 years on steel skins and frame integrity, 5 years on finish, 2 years on hardware. Extended warranty options are available for large projects.
Q: Do you provide installation supervision?
A: For projects above a certain size (typically 100+ units), we can provide installation supervision or training for local installers. This is particularly valuable for first-time specifiers of our door systems.
Q: Can existing wood or aluminum frames be reused?
A: Generally no. Steel door frames have different anchoring requirements and dimensional profiles. Reusing existing frames typically leads to performance issues. We recommend full replacement with prehung steel units.
Q: What about accessibility requirements?
A: We provide ADA-compliant threshold options with low-profile designs. The door operation force meets accessibility standards. Specify accessibility requirements early-threshold design affects the entire door system.
Specification Support
We provide U-value calculations, structural load data, fire test reports, and security certifications. For projects with unusual requirements, our engineering team develops custom solutions.
Contact our export team to discuss your project specifications.
SGL Steel Exterior Doors | Technical Specification Guide | Export Division
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