Isoboard Ceiling Insulation Boards – Strong, Lightweight & Energy Efficient
Isoboard ceiling boards are rigid high-density extruded polystyrene (XPS) insulation panels designed to deliver excellent thermal resistance while keeping ceilings thin, strong and lightweight. They are widely used in homes, offices and commercial buildings where consistent temperature control and long-term durability matter.
Unlike soft roll insulation, Isoboard panels do not sag, compress or lose shape over time. Once installed, the insulation performance remains stable for decades.
If you want lower electricity bills, improved comfort and a clean professional ceiling finish, Isoboard is one of the most reliable solutions available.
Why Choose Isoboard Ceiling Boards?
• High thermal insulation performance
• Reduces heat in summer and cold in winter
• Cuts heating and cooling costs
• Lightweight and easy to handle
• Moisture-resistant and mould-resistant
• Long lifespan with no sagging
• Suitable for residential and commercial ceilings
• Clean, rigid installation with neat finish
Isoboard is ideal where space is limited, but strong insulation is required.
Thermal Performance
| Specification | 30mm | 40mm | 50mm |
|---|---|---|---|
| R-Value | 1.143 | 1.524 | 1.905 |
| U-Value (W/m²K) | 0.875 | 0.656 | 0.525 |
| K-Value (Thermal Conductivity) | – | – | 0.02624 W/M.K |
- XPS has a better K-value than most insulation
- That means high efficiency per mm thickness
Isoboard Ceiling Structural & Mechanical Performance
| Specification | Value |
|---|---|
| Compressive Strength | ±250 – 300 kPa |
| Load Bearing | High |
| Dimensional Stability | Excellent |
| Edge Profile | Square / Shiplap (depending on product) |
Isoboard Moisture & Durability
| Specification | Value |
|---|---|
| Water Absorption | <1% (very low) |
| Moisture Resistance | Waterproof structure |
| Mould Resistance | Will not support mould |
| Longevity | 30+ years |
👉 Big advantage over glass wool:
- Does not sag
- Does not absorb moisture
Acoustic Performance
| Specification | Value |
|---|---|
| Sound Insulation | Low |
| NRC | Poor |
- XPS is not for sound insulation
- Do not sell it as such
BEST USE CASE
| Application | Suitability |
|---|---|
| Ceilings (below roof sheets) | Excellent |
| Concrete slabs | Excellent |
| Underfloor insulation | Excellent |
| Industrial/commercial | Excellent |
| Acoustic insulation | Poor |
Available Thicknesses
We supply Isoboard ceiling insulation in four practical thickness options:
• 30mm Isoboard
• 40mm Isoboard
• 50mm Isoboard
• 80mm Isoboard
Thicker boards provide higher R-values and better energy savings. Choose the thickness based on your climate zone, ceiling space and performance requirements.
Where Isoboard Works Best
Isoboard ceiling panels are perfect for:
• Homes and residential ceilings
• Offices and retail spaces
• Schools and clinics
• Factories and warehouses
• New builds and renovations
Especially effective for properties exposed to strong heat or cold.
Save Energy Every Month
Proper ceiling insulation can reduce energy loss through the roof by up to 30–40%. Isoboard helps stabilise indoor temperatures, meaning:
• less air conditioning in summer
• less heating in winter
• lower electricity costs all year
It pays for itself quickly.
Compare Alternatives
Looking for softer roll insulation or acoustic solutions?
You may also consider:
• Knauf ceiling insulation
• Aerolite insulation
• Isotherm insulation
✅ SPECIFICATIONS BLOCK (all thicknesses together)
Put this in a clean table or accordion.
Isoboard Ceiling Board Specifications
| Thickness | Thermal Resistance (R-Value)* | Panel Type | Material | Moisture Resistance | Fire Behaviour | Application |
|---|---|---|---|---|---|---|
| 30mm | ±1.05 | Rigid Board | XPS | Excellent | Self-extinguishing | Ceilings |
| 40mm | ±1.40 | Rigid Board | XPS | Excellent | Self-extinguishing | Ceilings |
| 50mm | ±1.75 | Rigid Board | XPS | Excellent | Self-extinguishing | Ceilings |
| 80mm | ±2.80 | Rigid Board | XPS | Excellent | Self-extinguishing | Ceilings |
*R-values may vary slightly by batch/manufacturer.
