The smart way to insulate
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Summit XPS insulation boards
Our flagship product, Summit XPS board, is made from ridged, extruded polystyrene foam and is designed to create a single layer of thermal and moisture protection on a building’s walls, roof, or floor, significantly contributing to its overall energy efficiency.
Summit offers the industry’s most comprehensive range of thickness options and flexibility in application and usage.
How many boards?
Measure the room you are insulating. Each board is 600 mm wide; pick the length that suits the room.
Enter the room's length and width to see how many you need.
The 10% waste allowance is our suggestion, not Summit's: it covers cuts at the walls. For a nail-up ceiling, battens go at no more than 700 mm centres, with 3 concealed clips per m² and about 1 litre of Summit XPS adhesive per 30 m². Tell us the profile you want (SMTG, PITG, SBTG or SMST) in your message.
Summit XPS Board is available in thicknesses of 30mm, 40mm, and 50mm and special orders of 60mm to 100mm. Boards are available in lengths between 1.8 m and 8m, and you can choose from four profiles: Smooth Tongue and Groove (SMTG), Pine Tongue and Groove (PITG), Smooth Beveled Tongue and Groove (SBTG) and Smooth Straight (SMST).
Insulation Board Types
Smooth Tongue and Groove
Pine Tongue and Groove
Smooth Bevel Tongue and Groove
Smooth Straight
Guidelines for Summit XPS Insulation Board Usage
Summit XPS insulation board is a bulk insulator, used to prevent the transfer of heat through conduction and convection
The greater the thickness the more insulation Summit XPS board will provide
All other factors being equal, temperatures will be more stable in better-insulated buildings
Different climatic regions require different insulation interventions to achieve similar levels of comfort (as well as legal compliance)
Summit XPS board is a thermal insulation solution. It should not be used in isolation as a sound barrier. Consult a noise reduction system specialist
Insulation board properties
Density = 35-37kg/m³
Compressive Strength = 310-360 kpa
Water Absorption = 0.5% by volume
Coefficient of Linear Thermal Expansion = 0.049mm per m per °C
Dimensional stability = <1.0%
Thermal Conductivity = 0.030W/mK
Combustibility and Flame Spread = B/B1/2/H&V/B - S1,D1 as per SANS 53501-1
Storage, handling and installation: general
Store Summit XPS insulation board in original packaging, out of the sun and weather elements. Handle with care to prevent damage to edges
Always paint Summit XPS insulation board in applications where direct or reflected sunlight will fall on it, to protect it from UV rays (which accelerate the ageing process)
If painting, use two coats of good-quality water based matt PVA paint. The first coat should be an acrylic filler coat to cover minor surface indentations and imperfections
If leaving it unpainted, wipe Summit XPS insulation board with a cloth soaked in a softened water solution immediately prior to installation to remove static charges from the board’s surface
Request a quote
Looking for Summit products? We offer competitive pricing and high-quality materials. Simply click on the products you need to add them to your quoting form. Contact us today, and we’ll provide you with a personalised quote tailored to your needs.