Summit XPS Extruded Polystyrene Insulation Boards

Summit XPS insulation boards offer South African homeowners a superior ceiling insulation solution. Manufactured from rigid extruded polystyrene (XPS), Summit XPS delivers excellent thermal insulation, moisture resistance, and structural durability.

Available in 30mm Summit XPS, 40mm Summit XPS, and 50mm Summit XPS thicknesses, these polystyrene ceiling boards are ideal for residential ceilings, commercial buildings, and industrial insulation projects.

Whether you’re insulating ceilings, walls, floors, or roofing systems, Summit XPS boards provide long-term energy savings, consistent performance, and a high-quality finish for a variety of building types.

At Home Insulations, we supply Summit XPS insulation across Johannesburg, Centurion, Pretoria, Cape Town, and Durban.

Use our insulation cost calculator and full price guide to estimate your project.

Benefits of Summit XPS Insulation Boards

✅ High Thermal Performance — Reduce heating and cooling costs year-round
✅ Excellent Moisture Resistance — Closed-cell XPS prevents water absorption and mold
✅ Lightweight & Easy to Handle — Simplifies ceiling and wall installations
✅ Durable Structural Strength — Withstands long-term load and compression
✅ Fire Resistant — Tested to SANS 428 fire safety standards (B/B1/2 classification)
✅ Environmentally Friendly — Free from HCFCs, CFCs, and low global warming potential
✅ SABS Approved — Compliant with South African quality standards

Where Can Summit XPS Be Installed?

• Residential ceilings (direct fix or suspended ceiling systems)
• Interior and exterior wall cladding
• Underfloor insulation applications
• Over-rafter and under-sheet roofing insulation
• Warehouses, factories, and industrial buildings
• Cold storage and refrigeration rooms
• Commercial and retail buildings
• Retrofit projects for existing homes

Summit XPS ceiling boards provide reliable long-term insulation performance, making them ideal for energy-efficient buildings across South Africa’s diverse climate conditions.

50mm Summit XPS Insulation Boards

50mm Summit XPS offers superior insulation performance for ceilings, walls, floors, and roofing systems in South African homes and commercial buildings. Manufactured with a high-density closed-cell extruded polystyrene (XPS) core, 50mm Summit XPS ceiling boards provide excellent thermal insulation, moisture protection, and long-term structural stability. With its rigid board format, 50mm Summit XPS is ideal for insulation where both high R-value and durability are essential.

Product Specifications

• Brand: Summit XPS
• Material: Extruded Polystyrene (XPS)
• Thickness: 50mm Summit XPS
• Board Sizes Available: 15 board size options (customizable)
• Density: 35–37 kg/m³
• R-Value: 1.67 (m²·K/W)
• Water Absorption (by volume): <1%
• Thermal Conductivity (λ): 0.030 W/m·K
• Compressive Strength (10% deformation): ≥ 300 kPa
• Fire Classification: B/B1/2/H (SANS 428)
• SABS Approved: Yes
• Global Warming Potential: <5 (low environmental impact)
• Compliance: SANS 10400-XA Energy Efficiency Standards

Key Benefits

✅ Excellent thermal insulation performance with high R-values
✅ Completely moisture-resistant – ideal for humid or damp environments
✅ Lightweight, rigid, and easy to handle during installation
✅ High compressive strength – suitable for load-bearing under floors and roofs
✅ Long-lasting, stable performance without sagging or deterioration
✅ SABS approved for South African building standards
✅ Environmentally friendly with zero ozone-depleting potential

With an R-value of 1.67, the 50mm Summit XPS helps maintain stable indoor temperatures throughout the year, reducing your energy bills and enhancing comfort. Its rigid structure, low water absorption, and long-term durability make it the go-to choice for both residential and commercial projects where consistent insulation performance is essential.

40mm Summit XPS Insulation Boards

40mm Summit XPS insulation boards deliver a powerful balance of strength, thermal performance, and versatility. Manufactured from extruded polystyrene (XPS) with a dense closed-cell structure, these boards provide reliable insulation for ceilings, walls, floors, and roofing systems across South African climates.

Product Specifications

• Brand: Summit XPS
• Material: Extruded Polystyrene (XPS)
• Thickness: 40mm Summit XPS
• Board Sizes Available: 15 board size options (customizable)
• Density: 35–37 kg/m³
• R-Value: 1.33 (m²·K/W)
• Water Absorption (by volume): <1%
• Thermal Conductivity (λ): 0.030 W/m·K
• Compressive Strength (10% deformation): ≥ 300 kPa
• Fire Classification: B/B1/2/H (SANS 428)
• SABS Approved: Yes
• Global Warming Potential: <5 (low environmental impact)
• Compliance: SANS 10400-XA Energy Efficiency Standards

Key Benefits

✅ High thermal efficiency with solid R-value performance
✅ Fully moisture-resistant — prevents mold, damp, and water absorption
✅ Lightweight and rigid — easy to cut and install
✅ Strong compressive strength for load-bearing installations
✅ Long-lasting durability without sagging or shrinking
✅ Fire-rated and fully SABS approved
✅ Eco-friendly production with low global warming potential

With an impressive R-value of 1.33, the 40mm Summit XPS thickness offers substantial energy savings, helping to stabilize indoor temperatures while lowering heating and cooling costs. The board’s superior moisture resistance makes it ideal for damp areas or under-roof applications where water ingress might compromise other materials. Whether you’re building new or upgrading existing insulation, 40mm Summit XPS offers excellent long-term performance.

30mm Summit XPS Insulation Boards

30mm Summit XPS insulation boards provide reliable thermal protection in a slim, lightweight profile — perfect for ceiling insulation, wall cladding, and underfloor systems where space is limited but performance is still essential. Manufactured from dense extruded polystyrene (XPS) with a durable closed-cell structure, the 30mm thickness offers excellent energy efficiency and long-term durability.

Product Specifications

• Brand: Summit XPS
• Material: Extruded Polystyrene (XPS)
• Thickness: 30mm Summit XPS
• Board Sizes Available: 15 board size options (customizable)
• Density: 35–37 kg/m³
• R-Value: 1.00 (m²·K/W)
• Water Absorption (by volume): <1%
• Thermal Conductivity (λ): 0.030 W/m·K
• Compressive Strength (10% deformation): ≥ 300 kPa
• Fire Classification: B/B1/2/H (SANS 428)
• SABS Approved: Yes
• Global Warming Potential: <5 (low environmental impact)
• Compliance: SANS 10400-XA Energy Efficiency Standards

Key Benefits

✅ Solid thermal performance for thinner installations
✅ Excellent moisture resistance to prevent mold and damp
✅ Lightweight, rigid boards for fast, easy installation
✅ High compressive strength — suitable for underfloors and ceilings
✅ Long-lasting insulation performance without degradation
✅ SABS Approved and fire-rated to South African standards
✅ Environmentally responsible production with minimal global warming impact

With an R-value of 1.00, 30mm Summit XPS helps improve indoor comfort, keeping your building cooler in summer and warmer in winter while lowering heating and cooling costs. Its water-resistant properties prevent moisture ingress, making it ideal for both residential and commercial construction projects.

Summit XPS vs Other Ceiling Insulation Products

When choosing ceiling insulation in South Africa, it’s important to understand how Summit XPS compares to other popular insulation materials. Each product offers unique benefits depending on your application and budget.

✅ Summit XPS vs Isoboard

Summary: Both Summit XPS and Isoboard are excellent rigid ceiling insulation solutions. Summit XPS typically offers better pricing without compromising thermal performance, moisture resistance, or structural integrity, making it a highly attractive option for residential and commercial projects.

✅ Summit XPS vs Glasswool (Knauf, Aerolite)

Summary: Summit XPS offers a full ceiling solution where the insulation doubles as the ceiling surface. Glasswool provides superior acoustic absorption but requires additional ceiling boards for aesthetics. Summit XPS is ideal for moisture-prone areas and fast ceiling installations.

✅ Summit XPS vs Expanded Polystyrene (EPS)

Summary: Summit XPS outperforms EPS in structural strength, moisture resistance, thermal consistency, and dimensional stability — making it the preferred solution for ceiling insulation applications that require long-term performance.

Certifications & Compliance for Summit XPS Insulation

Summit XPS insulation boards are fully certified and compliant with South African building regulations, fire safety standards, and green building guidelines. These certifications ensure that Summit XPS performs reliably in residential, commercial, and industrial applications while supporting sustainable building practices.

✅ Fire Safety Compliance (SANS 428)

• Summit XPS carries a B/B1/2/H&V classification under SANS 428, indicating it is not a flame-spread hazard.

• When exposed to fire, Summit XPS boards shrink away from heat sources and self-extinguish without producing flaming droplets.

• It also holds a B-s1, d1 classification under European standards, reflecting excellent fire performance with minimal smoke production.

✅ Energy Efficiency Compliance (SANS 10400-XA)

• Summit XPS fully supports compliance with South Africa’s SANS 10400-XA energy efficiency regulations.

• Its high R-values contribute to reducing heating and cooling loads in buildings, lowering long-term energy consumption.

✅ Industry Recognition (TIPSASA Membership)

• Summit XPS is recognized by the Thermal Insulation Products & Systems Association of South Africa (TIPSASA).

• TIPSASA recognition ensures adherence to strict manufacturing and performance guidelines for insulation products in South Africa.

✅ Green Building Contribution

• Summit XPS contributes towards green building certifications such as Green Star SA.

• Its energy-saving properties, moisture resistance, durability, and environmentally responsible manufacturing support sustainable design goals.

Summit XPS Ceiling Board Installation Overview

Summit XPS ceiling boards are designed for quick, clean, and efficient installation across multiple ceiling systems. Their lightweight rigid design simplifies handling, while their closed-cell structure ensures long-term insulation performance. Installation can be performed using either direct nail-up, over-purlin, or over-truss methods, depending on the ceiling structure.

✅ Nail-Up Ceiling Installation (Residential & Commercial Interiors)

• Fit timber or steel battens at maximum 700mm centres across ceiling structure.
• Secure perimeter battens around the room for stability.
• Trim boards to span wall-to-wall without butt joints wherever possible.
• Apply Summit XPS adhesive along battens at 200mm intervals.
• Use concealed clips and drywall screws at board edges (concealed by cornices).
• Light sanding and filler may be applied prior to painting for a flawless finish.
• Always apply two coats of quality water-based matt PVA paint for UV protection.

✅ Over-Purlin Installation (Industrial & Commercial Roofs)

• Boards laid horizontally from apex to eave, beginning and ending on purlins.
• Butt joints centered on purlins with 5mm expansion gaps.
• Roof sheeting secured directly through XPS boards into purlins using extended roofing screws.
• MDF spacers recommended to avoid potential squeaking under pre-painted roof sheets.
• Roofing ridge vents recommended for thicker boards to prevent heat buildup.

✅ Over-Truss or Over-Rafter Installation (Pitched Roof Applications)

• Boards laid horizontally across trusses or rafters, with joints centered on top chords.
• Counter battens installed above boards to secure panels and resist uplift.
• Screws inserted through counter battens and XPS into rafters at 300mm intervals.
• Structural bracing may be required for top chord stability per engineering specifications.
• Finish with standard battens and roofing materials above.

✅ Important Installation Notes

• Use only water-based adhesives, cleaners, and paints.
• Avoid contact with solvent-based products which may damage the boards.
• Heavy lighting fixtures must be independently supported from structural timbers.
• LED lighting is preferred due to low heat emission near ceiling boards.
• Boards may be wiped with dishwashing liquid prior to installation to remove static charges.

Professional installation ensures optimal long-term performance of Summit XPS ceiling insulation boards. Always follow manufacturer guidelines and consult qualified installers where necessary for complex applications.

Why Choose Home Insulations?

We’ve supplied thousands of square meters of Summit XPS across South Africa. Here’s why homeowners and contractors trust us:

✅ Over 30 years of insulation experience
✅ Friendly, trained installers
✅ Prompt delivery and professional installation
✅ Branches in Johannesburg, Centurion, Pretoria, Cape Town & Durban
✅ We only use genuine Summit XPS (no imitation products)

Frequently Asked Questions