XPS vs PIR Insulation Boards: Selection Guide
XPS and PIR are rigid thermal insulation boards used in building and roof assemblies. Both products can provide low thermal conductivity, compressive strength and low water absorption, but their listed applications and available finishes differ. Product selection should be based on the complete roof or wall system rather than board type alone.
What Is XPS Insulation?
XPS stands for extruded polystyrene. SRD Infra lists XPS boards for over-deck insulation, cavity wall insulation, external insulation and finish systems, and cold storage roof and wall insulation. The listed XPS range includes multiple thicknesses and is suited to applications requiring compressive strength and low water absorption.
What Is PIR Insulation?
PIR stands for polyisocyanurate. SRD Infra lists PIR boards for over-deck, under-deck and metal deck insulation in residential and commercial buildings. Available finishes include aluminium foil, glass veil and bitumen finishes, allowing the board facing to be coordinated with the intended assembly.
XPS vs PIR: Key Differences
| Selection factor | XPS boards | PIR boards |
|---|---|---|
| Listed applications | Over-deck insulation, cavity walls, EIFS and cold storage | Over-deck, under-deck and metal deck insulation |
| Listed finishes | Confirm the required board finish for the selected system | Aluminium foil, glass veil and bitumen finishes |
| Moisture consideration | Listed with very low water absorption | Listed with very low water absorption |
| Compressive requirement | Listed with high compressive strength | Listed with high compressive strength |
| Typical decision point | Commonly considered for exposed-to-moisture assemblies, walls and cold storage systems | Commonly considered where roof or metal deck assembly and board facing are important |
How to Choose Between XPS and PIR
Compare the project specification, required thermal performance, board thickness, compressive loading, moisture exposure, fire requirements, facing compatibility and installation location. For roof systems, coordinate the insulation with the waterproofing membrane, vapour control layer, deck type and protection layer.
Use XPS When the Assembly Requires
- Over-deck insulation with low water absorption
- Cavity wall insulation
- External insulation and finish systems
- Cold storage roof or wall insulation
Consider PIR When the Assembly Requires
- Over-deck or under-deck roof insulation
- Metal deck insulation
- A specified aluminium foil, glass veil or bitumen facing
- A rigid insulation board coordinated with a commercial roof assembly
Related SRD Infra Resources
- XPS Extruded Polystyrene Boards
- PIR Polyisocyanurate Boards
- Thermal Insulation Products
- Thermal Insulation Supplier India
- Thermal Insulation Supplier Delhi NCR
- Roof Waterproofing Membrane Supplier India
- Contact SRD Infra
FAQs
Is XPS or PIR better for roof insulation?
The better board depends on the roof assembly, required thermal performance, moisture exposure, compressive loading, deck type, facing and waterproofing system. The complete specification should be reviewed.
Can XPS be used in cavity walls?
SRD Infra lists cavity wall insulation as an application for its XPS boards. Installation should follow the project design and product requirements.
What finishes are available for PIR boards?
SRD Infra lists aluminium foil, glass veil and bitumen finishes for PIR boards.