COMMON MISTAKES IN COLD INSULATION INSTALLATION USING PIR – SOLUTIONS FOR IMPROVEMENT

Cold insulation installation using insulation materials plays a crucial role in the operational efficiency of cold storage facilities, breweries and beverage plants, pipelines, LNG tanks and terminals, as well as other energy-related projects. This article analyzes common mistakes during the installation process and presents technical solutions to optimize performance and ensure the long-term durability of the system.

1. Why Proper Cold Insulation Installation Matters?

In cold storage projects, LNG terminals, breweries, beverage or chemical plants, the cold insulation layer not only affects energy efficiency but also determines the safety, service life, and operating costs of the facility.

PIR (Polyisocyanurate) has become one of the most preferred materials for cold insulation due to its outstanding properties:

• Low thermal conductivity (λ ~ 0.022–0.024 W/m·K), offering higher efficiency than PU or EPS.
• Fire resistance in compliance with EN 13501:2018 – Class C – s3, d0, which means it does not produce toxic smoke or flaming droplets that spread fire.
• High mechanical strength, suitable for deep-freeze and cryogenic environments.

However, in practice, even a minor installation error can significantly reduce the effectiveness of PIR, leading to thermal losses, pipe freezing, and costly repairs.

2. Common Mistakes in Cold Insulation Installation using PIR

2.1. Using Inappropriate Insulation Materials

In many projects, contractors choose to apply in-situ foam insulation (spray foam). Since the foam is sprayed directly onto the surface of pipes, tanks, or equipment, the coating thickness is often inconsistent due to various factors. This results in uneven insulation coverage, with areas that are too thick or too thin.

Consequence: Uneven insulation performance across different areas leads to thermal losses, condensation, ice formation, mold growth, and damage to the insulation system.

Solution: Use pre-formed PIR insulation manufactured to match the exact design dimensions. This approach minimizes cutting and fitting errors on-site and ensures consistent quality control throughout installation.

2.2. Incorrect Installation of the Vapor Barrier

A common mistake is the improper sealing of the vapor barrier (such as aluminum foil or specialized adhesive tape), including insufficient use of adhesive or sealant, or damage to the vapor barrier during installation.

Consequence: Moisture penetration can occur, damaging the PIR structure, reducing its thermal performance, and causing thermal leakage.

Solution: Use high-quality aluminum adhesive tape specifically designed for vapor sealing. Inspect all joints with a light test before applying the metal cladding to ensure the vapor barrier is completely airtight.

2.3. Errors in Installing Metal Cladding

Improper fabrication or installation of metal cladding can lead to several risks:

• Oversized cladding: creates gaps that allow water ingress into the insulation layer.
• Overtight cladding: may cause the sheets to pop or deform due to thermal expansion of the metal.
• Sharp edges not treated: can easily tear the vapor barrier beneath.

Solution: Fabricate the cladding to precise dimensions, round off all edges, and follow standards such as ASTM C585 or EN 13480 to ensure proper sealing and long-term durability.

2.4. Incorrect Insulation Thickness

Some projects fail to maintain the specified insulation thickness or install layers unevenly. In addition, over-tightening metal bands can compress and deform the insulation layer.

Consequence: Reduced cooling efficiency, increased energy consumption, and higher operating costs.

Solution: Use pre-formed PIR insulation with the correct design thickness from the start to ensure accurate installation and apply metal bands with proper tension.

2.5. Material Affected by Site Conditions

In practice, insulation materials can become damp due to rain or improper storage. Once wet, PIR insulation loses its thermal performance.

Solution: Store materials under a covered and dry area, and ensure they remain dry before and during installation. If any insulation becomes wet, it must be dried or replaced before metal cladding is applied.

2.6. Ignoring Special Details

Elbows, tees, valves, and flanges are often treated carelessly—assembled mechanically without proper use of adhesives or sealants.

Consequence: Moisture easily penetrates, leading to freezing, condensation inside the pipeline, and structural damage to the PIR insulation.

Solution: Fabricate pre-formed elbows, T-joints, and flange boxes according to design drawings, and properly seal all joints using specialized adhesive or sealant.

3. Comprehensive Solutions to Improve Installation Cold Insulation Quality

To minimize risks and optimize cold insulation performance, a set of comprehensive measures should be applied:

• Prepare and store materials in accordance with SOP (Standard Operating Procedures).
• Follow design drawings and the manufacturer’s installation guidelines.
• Seal all joints using specialized adhesive to ensure a completely airtight vapor barrier.
• Fabricate metal cladding to the correct dimensions, ensuring both tightness and aesthetic appearance.
• Provide training for workers and conduct QA/QC supervision according to the ITP (Inspection & Testing Plan).
• Prioritize the use of pre-formed PIR insulation to eliminate most installation errors from the outset.

A cold insulation project only achieves true efficiency when materials, engineering, and installation are executed in full synchronization. In practice, the cost of rectifying installation errors is typically 3–5 times higher than the cost of doing the job correctly from the beginning.

Using pre-formed insulation materials delivers clear advantages — reducing installation errors, extending system lifespan, and lowering operational costs.

Black Cat Insulation Technical JSC currently provides:

• High-quality PIR insulation materials
• Pre-fabrication according to detailed design drawings
• Full-scope installation and commissioning services

Choose an integrated insulation solution from the start — for a system that is durable, safe, and energy-efficient.

See more articles on the same topic: WHAT IS THE DIFFERENCE BETWEEN PREFORMED PIR FOAM AND FILLED PUR FOAM?