Best Practices For Installing Polyisocyanurate Pipe Insulation

28 July 2023
 Categories: , Blog


The effectiveness of any insulation material, including polyisocyanurate, hinges significantly on the quality of its installation. A well-executed installation process ensures maximum energy efficiency, prolonged lifespan of the insulation, and cost savings. Here are some best practices for installing polyisocyanurate pipe insulation.

Prepare the Pipe Surface

A successful installation starts with a well-prepared pipe surface. Ensure the pipe is clean, dry, and free of any rust, oil, or other contaminants. These substances may interfere with the insulation's adhesion, compromising the effectiveness and longevity of the insulation. 

In the case of outdoor installations, consider applying a rust inhibitor to metallic pipes to prevent future corrosion.

Measure and Cut

Accurate measurement is critical in the installation process. Measure the pipe's diameter and length to determine the appropriate size of insulation needed. When cutting the polyisocyanurate insulation, use a sharp utility knife and ensure the cuts are straight and clean. 

Improperly sized insulation can lead to a poor fit and the decreased effectiveness of the insulation.


Apply the cut polyisocyanurate insulation onto the pipe, making sure it fits snugly. Many polyisocyanurate pipe insulation products come with a self-sealing lap, which should be firmly pressed together to ensure a secure seal. 

If the product doesn't include this feature, use an appropriate adhesive to bond the insulation to the pipe and seal the longitudinal seam.

Securing the Insulation

It's crucial to properly secure the insulation to prevent it from shifting or falling off the pipe over time. This can be accomplished with the use of bands, wires, or tapes specifically designed for insulation applications. 

The spacing of these fasteners should be carefully considered - too few could lead to sagging or shifting, while too many could unnecessarily compress the insulation and reduce its effectiveness.

Applying the Protective Jacket

After the insulation is properly fitted and secured, a protective jacket should be applied, especially in outdoor or industrial settings. This jacket serves as a barrier against moisture, mechanical damage, and UV degradation, helping preserve the integrity of the insulation. 

Materials used for jackets can vary from aluminum, PVC, to multi-layer laminates, each suitable for different environments.

Inspection and Maintenance

Once installation is complete, an initial inspection should be carried out to confirm the insulation's proper fit and securement. Regular inspections thereafter are necessary to check for any damage or degradation, which should be promptly addressed to maintain the insulation's effectiveness.

Mitigating Thermal Bridging

Thermal bridging occurs when heat travels across more conductive components in the insulation system, reducing the overall insulation performance. To prevent this, it's crucial to ensure that there are no gaps in the insulation and that insulation joints, seams, and hangers are properly addressed.

Keep these tips in mind when looking for a polyisocyanurate pipe insulation service near you.