Author: Jouth Zhao, Senior Engineer, Dengtai Staircase Manufacturing Co., Ltd.
Answering these five questions before you request a quotation will save you time, reduce the risk of ordering the wrong product, and help suppliers provide accurate pricing. Based on 500+ project reviews, these are the questions that most frequently produce specification gaps when left unanswered.
Question 1: What Standard Applies to My Installation?
Why it matters: OSHA 1910.23, EN ISO 14122-4, AS 1657, and BS 4211 have different dimensional requirements. A ladder built to one standard may not comply with another.
How to answer:
- Determine the country where the ladder will be installed
- Check if the project specification references a specific standard
- For international EPC projects, the contract typically states the governing standard
- If unsure, use: USA = OSHA, Europe = EN, Australia = AS, UK = BS
Our recommendation: State the standard explicitly in your RFQ: “Ladder shall comply with [standard + revision], including [specific clauses if known].”
Question 2: What Is the Total Ladder Height?
Why it matters: The total height determines the ladder section configuration, cage requirement, and whether intermediate platforms are needed. The most common order error is providing the wall height without adding the required extension above the landing.
How to answer:
- Measure from finished ground level to the landing surface level
- Add the required extension above landing: 1,067mm (42″) for OSHA, 1,100mm for EN
- The total = wall height + extension
- Provide BOTH the wall height AND the total ladder height in your RFQ
Example: Wall height 5.0m + OSHA extension 1.067m = Total ladder height 6.067m (specify 6.0m section + top extension).
Question 3: What Environment Will the Ladder Be Installed In?
Why it matters: The environment determines the minimum acceptable material and coating specification. Using HDG in a coastal environment will result in premature corrosion and replacement within 8-15 years instead of the expected 25-40 years.
How to answer, by environment:
| Environment | Material Recommendation |
|---|---|
| Indoor, dry | HDG Q235B (≥45μm) |
| Outdoor urban | HDG Q235B (≥80μm) |
| Industrial (chemical, refinery) | HDG (≥85μm) or SS304 |
| Coastal (<5km from sea) | SS304 minimum |
| Offshore / marine | SS316 |
| Food processing | SS304 (SS316 for washdown) |
| Water/wastewater | SS316 |
If unsure, provide the installation address. Dengtai can determine the ISO 9223 corrosivity category for the location and recommend the appropriate material.
Question 4: What Does the Ladder Mount To?
Why it matters: The substrate determines the anchor type and bracket design. Ordering brackets for concrete anchors when the wall is hollow brick results in anchors that cannot be installed.
How to answer:
- Concrete (solid, reinforced): Standard mechanical expansion anchors
- Concrete (hollow block): Chemical/epoxy anchors with mesh sleeve
- Steel column: Through-bolts
- Insulated panel/column: Extended brackets (specify insulation thickness)
- Brick/masonry: Chemical/epoxy anchors
If the substrate is unknown or inaccessible, state this in the RFQ. The supplier can provide universal brackets and recommend anchor options based on the most likely substrate type.
Question 5: What Documentation Do You Need?
Why it matters: Documentation requirements vary dramatically by industry. A warehouse ladder may need only a Certificate of Conformance. A pharmaceutical plant ladder needs full material traceability, weld inspection reports, and compliance declarations. Ordering without specifying documentation requirements can result in product acceptance delays or rejection.
Choose your documentation level:
| Level | Documents Included | Typical Application |
|---|---|---|
| Basic | Certificate of Conformance | Non-regulated; warehouse, general commercial |
| Standard | MTCs + Coating Report + Dimensional Report + Compliance Declaration | Industrial, commercial, most applications |
| Regulated | Standard + ISO 5817 Weld Reports + NDT Reports + Material Traceability | Oil & gas, pharmaceutical, nuclear, food |
| Custom | As specified in your purchase order | EPC projects, government contracts |
Include in your RFQ: “Supplier shall provide [documentation level] documentation package with each shipment, including [list specific documents].”
Bonus Questions (If Applicable)
- Do you need a security door at the base? Required by many insurance policies for roof access ladders.
- Do you need anti-slip rungs? Recommended for ladders in wet, icy, or oily environments.
- Is the installation in a seismic zone? Provide the seismic zone per your local building code.
- What is your target delivery date? Affects production scheduling and shipping method.
- Do you need installation services? Dengtai can recommend qualified local installation partners in select regions.
Quick Reference: Information to Include in Your RFQ
Copy this checklist into your RFQ document:
[ ] Project name and location (city, country)
[ ] Governing standard (OSHA 1910.23 / EN ISO 14122-4 / AS 1657 / BS 4211)
[ ] Ladder type (fixed / caged / cat ladder / custom)
[ ] Total quantity
[ ] Height per ladder (wall height + extension above landing)
[ ] Material (HDG / SS304 / SS316 / "recommend based on environment")
[ ] Environment (indoor / outdoor urban / coastal / industrial / food processing)
[ ] Wall substrate (concrete / steel column / brick / unknown)
[ ] Special requirements (security door / anti-slip / seismic / extended brackets)
[ ] Documentation level (basic / standard / regulated)
[ ] Target delivery date
[ ] Incoterms preference (FOB / CIF)
[ ] Contact information (name, email, WhatsApp)FAQ
Q: Can I send a photo of the installation location instead of measurements?
Photos are helpful context but cannot replace measurements. Always provide measured dimensions. A photo helps the supplier understand the installation context (substrate type, access constraints, surrounding equipment) beyond what measurements capture.
Q: What if I don’t know the wall substrate?
State “unknown” in your RFQ. The supplier will quote universal brackets (compatible with most substrates) and include guidance for on-site substrate verification before ordering anchors. Dengtai can also review photographs of the wall to provide a preliminary substrate assessment.
Q: What is the most common information gap in RFQs we receive?
By far, the governing standard. Approximately 40% of RFQs do not specify which standard applies. This is also the gap with the most significant consequences — wrong standard = wrong ladder dimensions.
Key Takeaways
- Name the standard — the most important and most frequently omitted specification
- Measure correctly — wall height + extension above landing = total ladder height
- State the environment — determines material selection and coating specification
- Identify the substrate — determines anchor selection and bracket design
- Specify documentation needs — prevents post-delivery acceptance delays
Related Resources
- Common Mistakes in Ladder Selection →
- Questions to Ask a Supplier →
- How to Choose a Manufacturer →
- Buyer’s Guide Hub →
Send your completed RFQ checklist to receive a quotation within 24 hours.
Email: sales@dtsteelladder.com
WhatsApp: +86 155 1187 9488
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