Introduction
Iran, with its vast climatic diversity, from temperatures above 70 degrees in the south to sub-zero cold in the northwest and high humidity on the coasts, creates unique challenges for selecting building materials. Seismic joint covers, as a critical part of building seismic safety, must not only provide relative movement but also be resistant to environmental factors such as UV radiation, extreme temperature changes, and humidity. Incorrect selection can reduce the useful life of the cover to less than 5 years and increase repair costs.
In this comprehensive article, we will guide you step by step on how to choose the best material and cover model based on your project’s climatic conditions. We will also review the technical features of Agor Ehtad models, designed for different climates in Iran, so that engineers and employers can make informed decisions.
Climatic Factors Affecting the Selection of Seismic Joint Covers
Iran’s climatic conditions are very diverse, and each region creates specific technical requirements for seismic joint covers. In the following, we will examine the main factors.
Severe Temperature Changes (Hot and Cold Regions)
In hot regions like Khuzestan or Sistan, air temperatures reach 70 degrees, and daily fluctuations of up to 40 degrees cause severe expansion and contraction. The material’s thermal expansion coefficient should be close to that of concrete (12 × 10⁻⁶ m/m.°C) to avoid stress.
In cold regions like Ardabil or Kurdistan, temperatures below −30 degrees cause rubber strips to become brittle. Conclusion: The cover must use materials like VMQ silicone with a tolerance of −60 to +250 degrees.
High Humidity and Corrosion (Coastal and Humid Regions)
In northern Iran (Mazandaran, Gilan), relative humidity above 85% and acid rain (pH < 5) cause galvanic corrosion of aluminum. On the Persian Gulf coasts, sea salt accelerates corrosion.
For these conditions, materials like duplex 316L stainless steel with 2000 hours of Salt Spray resistance are essential.
UV Radiation and Dust (Desert and Central Regions)
UV radiation in Iran is up to 40% higher than in Europe, causing ordinary polycarbonate to yellow. Silica dust also creates abrasion.
Materials with co-extruded UV layer and Hard-Coat coating with 6H hardness are suitable.
For more information on the impact of these factors, read the article The Effect of Iran’s Climate on Seismic Joint Covers.
Applications and Technical Benefits of Climate-Resistant Seismic Joint Covers
Climate-resistant seismic joint covers not only ensure seismic safety but also offer long-term advantages.
- In hot climate projects: Prevents buckling with a low expansion coefficient (e.g., aluminum 6063-T6 with 23 × 10⁻⁶ m/m.°C)
- In humid regions: Reduces corrosion by up to 90% with marine epoxy coating
- In desert regions: Maintains transparency with a 25-year anti-yellowing warranty
Benefits: Up to 70% reduction in maintenance costs, increased useful life to 30 years, and compatibility with Iranian Code 2800.
Introduction of Agor Ehtad Models for Different Climatic Conditions
DesertMax Series – For Hot and Desert Regions
- Aluminum profile with 120-micron polyester coating
- VMQ silicone strip resistant up to 250 degrees
- Dust-Free system to prevent abrasion
- Implemented in southern refineries
MarinePro Series – For Humid and Coastal Regions
- Duplex 316L stainless steel + marine epoxy coating
- Peroxide-cured EPDM strip resistant to ozone
- 5000 hours Salt Spray resistance
- Implemented in Kish hotels
UrbanShield Series – For Central Regions and Metropolises
- Anodized aluminum 25 microns + nano-ceramic
- Co-extruded UV layer for resistance to acid rain
- Suitable for moderate temperature changes
- Implemented in Tehran towers
Download the catalog of these models at Agor Ehtad Climate-Resistant Seismic Joint Cover Products.
Comparison Table of Models Based on Climatic Conditions
| Climate / Region | Recommended Model | Temperature Resistance (°C) | Humidity Resistance | UV Resistance | Approx. Cost (million/m²) | Project Example |
|---|---|---|---|---|---|---|
| Hot (Khuzestan) | DesertMax | −10 to +70 | Medium | Very High | 12–18 | Ahvaz Refinery |
| Humid (North) | MarinePro | −20 to +40 | Very High | High | 20–30 | Chalus Hotel |
| Desert (Yazd) | DesertMax | −15 to +55 | Low | Very High | 10–16 | Kerman Tower |
| Cold (Ardabil) | UrbanShield | −30 to +35 | Medium | Medium | 8–14 | Tabriz Complex |
| Metropolis (Tehran) | UrbanShield | −10 to +45 | High | High | 9–15 | Elahieh Towers |
Guide for Selecting Seismic Joint Covers Based on Climate
Selecting the right cover begins with a precise assessment of the climate. First, identify your project’s climate: in hot and desert regions, thermal and UV resistance are priorities, while in humid and coastal regions, anti-corrosion and moisture resistance are more important.
In the next step, evaluate the technical requirements. If the joint width exceeds 200 mm, the DesertMax series is suitable. For humidity above 80%, the MarinePro series will be the best choice.
Step-by-step installation includes preparing the concrete with epoxy resin, installing the profile with A4-80 stainless steel screws, and sealing with clear silicone. Finally, a ±400 mm movement test and a water/dust penetration test are performed to ensure performance.
Implementation and Maintenance Tips Based on Climate
In hot regions, an expansion gap of at least 5 mm is essential to prevent thermal stress. In humid climates, monthly washing with nano anti-corrosion materials is recommended to control corrosion.
In desert regions, a dust filtration system and annual inspection prevent abrasion. In cold regions, using thermal washers prevents freezing. Generally, Agor Ehtad’s 10-year warranty is valid with a certified installation report.
The common challenge of premature corrosion is easily solved by selecting models with epoxy coating, ensuring long-term performance.
Case Study: Kish Residential Tower Project (2025-2026)
This project was executed in a coastal humid climate with the main challenge being 95% humidity combined with sea salt. The MarinePro model with 316L stainless steel was selected, and after 12 months, no corrosion was observed, and complete sealing was maintained.
Conclusion
Selecting seismic joint covers based on climate is key to building safety and durability. Agor Ehtad’s DesertMax, MarinePro, and UrbanShield series, with their superior technical features, offer the best balance between resistance and cost. By carefully assessing your project’s climate, you can reduce maintenance costs by up to 80% and increase useful life.
To accurately select the model based on your project’s climate, send your plans and location. The Agor Ehtad team provides free consultation and a technical proposal.
FAQ
1. What is the best seismic joint cover for hot regions?
The DesertMax series with polyester coating and high thermal resistance.
2. Does the seismic joint cover rust in humid regions?
No, with the MarinePro model using duplex stainless steel, it has a 20-year anti-corrosion warranty.
3. How much more expensive is a climate-resistant cover?
30–50%, but the return on investment comes from reduced repairs.