The Ultimate Solution to Swimming Pool Insulation

Styropool is made from Ravatherm XPS X (extruded polystyrene) and is available in three different grades to meet the needs of a wide range of swimming pool types and depths.


Provides a long-term solution for insulating swimming pools, helping to create energy efficient pools with low running costs

Achieves thermal resistance up to 4.83 WmK

Manufactured to order in Sheffield, from stocked materials


Our experienced technical team will work with you to determine the best Styropool solution to ensure that your swimming pool meets Building Regulations.

Styropool is available in three different grades to meet the needs of a wide range of swimming pool types and sizes:

GradeCompressive Strength Design Load
Styropool 300300 kN/m2130 kN/m2.
Styropool 500500 kN/m2180 kN/m2.
Styropool 700700 kN/m2250 kN/m2.

The design load is that load on the insulation which will give a maximum compression of 2% after 50 years.

Styropool is manufactured from extruded polystyrene and is blown using recycled CO2. Styropool has Ozone Depletion Potential (ODP) of zero and Global Warming Potential (GWP) of less than five. It is 100% recyclable. Styropool offers exceptionally low water absorption with less than 0.5% after 28 days immersion.

Physical Properties

Compressive Strength kN/m2Design Load kN/m2Length
Thickness mm
7007002501250600Shiplap50, 100

Thermal Resistance m2K/W

ThicknessStyropool 300Styropool 500Styropool 700

Technical Properties

Mechanical PropertiesNORMUNITStyropool 300Styropool 500Styropool 700
Compressive Strength @ deformation or yieldBS EN 826 kN/m2 300500700
Desgin Load max. 2% deformation @ 50 years BS EN 1606 kN/m2 130180250
Water Absorption Properties NORMUNITStyropool 300Styropool 500Styropool 700
Dimensional Stability 48hrs@23C & 90%RH BS EN 1604 %< 2< 2
Dimensional Stability 48hrs@70C & 90%RH %< 3< 5< 5
Dimensional Stability under load BS EN 1605 < 5< 5
Reaction to fire BS EN 13501-1 Euroclass E EE
Misc PropertiesNORMUNITStyropool 300Styropool 500Styropool 700
Water pick-up - immersion of full board (28 days) BS EN 12087 vol % < 0.4 < 0.4 < 0.5
- diffusion BS EN 12088 vol % > 3< 3
- freeze/thaw BS EN 12091 vol % < 0.5< 1
Water vapour diffusion (µ-value) BS EN 12086 185 150-210150-210


Styropool can help create energy efficient pools with low running costs whilst also meeting current Building Regulations. The benefits include:

  • Excellent thermal performance in order to meet your project thermal requirements
  • High compressive strength, making it ideal for insulating the base and retaining walls of a swimming pool
  • Exceptionally low water absorption and can be installed directly below concrete
  • Supplied from our Sheffield warehouse for collection or delivery throughout the UK

Styropool and Building Regulations

Building Regulations Part L1A 2010 requires a swimming pool that is part of a dwelling to achieve a minimum thermal performance, equivalent to a U value of 0.25 W/m2K. The U Value is derived from a combination of variables including:

Ground Type

Differences between soil type may impact on the calculation.

Pool Construction Method

Every material component contributes to the overall U value, and this will vary from project to project.

Structural Demands

This will determine the grade of Styropool and its associated thermal performance.

P/A Ratio

Where P is the perimeter and A is the pool area. The higher the P/A ratio the more insulation required.

Pool Shape

The shape of the pool will impact the P/A ratio where the pool area is constant.

Depth of Pool

The greater the depth the better the U value.

Insulation Location

Styropool can be installed below the structural element of the swimming pool. The closer the insulation is to the heating source, the faster the insulation will respond, and the pool temperature will rise faster but decline faster when the heat source is switched off. When located below the structural element, it will create a heat sink and therefore once at temperature the pool will have a much slower heat loss if the source is switched off.

Typical Example

Rectangular Pool: 10m x 5m
Area: 50m2
Perimeter: 30LM
P/A: 0.6
Pool Depth: 1.5m
Construction: 200mm concrete on to Styropool insulation with 100mm Styropool 300 in the walls and 100mm Styropool 300 in the floor.
U value: 0.24 w/m24K

Our friendly and knowledgeable team are on-hand to offer expert advice and help.

Tel: 0114 275 2881
Fax: 0114 278 6840


NEED ASSISTANCE? Please contact us during office hours on 01909 774 914 or via the contact form.

For large orders and custom sizes of Ravatherm XPS X, please contact our dedicated Foam Fabrication and Distribution division on 01909 774 914. Alternatively, submit your enquiry through to

Frequently asked questions

How does Ravatherm XPS X react to fire?2023-06-30T12:31:30+01:00

Ravatherm XPS X is rated Euroclass E under BS EN 13501-1 Reaction to Fire test. For more information regarding Ravatherm XPS X’s reaction to fire, please refer to Ravago’s comprehensive product brochure.

What is Styropool? Ravatherm XPS X?2023-06-12T13:16:44+01:00

Styropool is made from Ravatherm XPS X – an extruded polystyrene. It was first developed and produced in the 1940’s by Dow Chemical Company in the USA. The process of extruding polystyrene results in a material with uniformly small, closed cells and an unrivalled set of properties which make it ideal for insulation and also as a core in lightweight structural panels.

Why can I no longer buy blue Styrofoam?2023-06-12T13:18:09+01:00

The Dow Styrofoam name has changed to Ravatherm XPS X. This product is now manufactured by Ravago Building Solutions – Europe’s largest manufacturer of XPS X insulation. The level of quality and availability has remained the same. If you have any questions regarding this change, please contact our technical sales team.

Can I open a trade account?2023-06-12T13:18:32+01:00

Credit accounts may be considered for larger, or regular orders. Please contact our sales office for further details on 01909 774 914. Other payment methods include credit card through our online shop.

Contact us

Get in touch to find out more about pricing, or to discuss your requirements in more detail.

Get in touch to find out more about pricing, or to discuss your requirements in more detail.

Call us on 0114 249 5626

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