Your Cart

42mm SIPs Structural Insulated Panel ǀ Plywood and EPS 8x4

42mm SIPs Structural Insulated Panel ǀ Plywood and EPS 8x4 2400mm x 1200mm square edge boards
42mm SIPs Structural Insulated Panel ǀ Plywood and EPS 8x4
  • EPS Ply SIP High-quality Construction Board
  • 2400mm x 1200mm square edge boards 8x4
  • Structural Insulated Panel EPS and Plywood SIPs
  • Strong, energy efficient and cost effective solution
  • Closed cell standard expanded polystyrene insulation core
Estimated delivery:
In Stock
£ 93.32
Ex VAT: £ 77.77
  • Brand: Various
  • Model: 42mm SIPs EPS Plywood
  • Dimensions: 2,400mm x 1,200mm x 42mm
  • SKU: 42mm SIPs Ply
  • Product code: P1-2376
  • MPN: 42mm SIPs EPS and Plywood

Options available

42mm Structural Insulated Panel EPS and Ply SIPs is a high-quality construction board consisting of an insulating 30mm EPS70 Expanded Polystyrene Kay-Metzeler insulation core sandwiched between two 6mm structural plywood facings that is used in floors, walls and roofs.

EPS Ply SIP Panel is made of closed cell standard expanded polystyrene insulation core bonded to WBP grade 6mm Plywood sheathing board on both sides using solvent free polyurethane adhesive.

Our structural insulated panels are 2400mm x 1200mm square edge boards which can be joined together without any special shaping with the most basic and simple butt joint technique.

SIPs are extremely strong, energy efficient and cost effective solutions designed to provide high levels of thermal insulation in one easily applicable product available in standard 8x4 size.

Structural Insulated Panel provides ecologically friendly and reliable long term energy savings for buildings, but can be damaged by moisture, to avoid this problem additional moisture resistant panels or waterproof membrane can be installed.

The thermal conductivity of the 6mm WBP (weather and boil-proof) grade Plywood Facings is 0.13W/mK (Lambda value).

The thermal conductivity of the K-M Expanded Polystyrene EPS70 core insulation board is 0.037W/mK (Lambda value).

6mm Plywood density is 680kg/m3 – 700kg/m3, so it's an ideal sheet material for structural projects.

EPS70 core is moisture resistant, rot proof, unaffected by bacteria, mould or fungi and is non-toxic, non irritant and odourless insulation, compatible with most building products.

We don't recommend using our SIP's for external wall construction due to the square edge board profile.




Thickness: 42mm overall

Length: 2400mm

Width: 1200mm

Board coverage: 2.88m2

Density (EPS Core): 15kg/m3

Density (Ply facings): 680-700kg/m3

Profile: Square Edge

Weight: 32.00kg

Thermal Conductivity (EPS Core): 0.037W/mk

Thermal Conductivity (Ply facings): 0.13W/mk

R-Value (EPS Core): 0.80m2K/W

Compressive Strength (EPS Core): >70 kPa (10% Compression)

Fire Rating (Reaction to Fire – EPS core): F



 · BS EN ISO 9001 Quality Management System

 · BS EN ISO 14001 Environmental Management System


Thermal conductivity is dependent on facings and product thickness.


*Further information may be found in our Downloads section.

Fairly easy access to all PDF files.

Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheet 

*Special Product - Non returnable cancelable.

Board covarage 2.88 m2
Compressive Strength 70 kPa (EPS core)
Density 15kg/m3 (EPS) ǀ 680-700kg/m3 (Ply)
Length 2400mm
Material EPS core ǀ Plywood facings
Profile Square Edge
R-Value 0.80m2K/W (EPS70 core)
Size 1200mm x 2400mm
Thermal Conductivity EPS 0.037W/mk ǀ Plywood 0.13W/mK
Thickness 42mm overall
Weight 32.00kg
Weight/m2 11.11kg
Width 1200mm
Finish 6mm WBP Plywood
Shipping method Articulated Vehicle ǀ Courier
Applications Roofs ǀ Walls ǀ Floors ǀ Construction
Vapour Control Layer No
Fixing method Butt joint technique
Features Cost Effective EPS and Plywood SIPs
Manufacturer Custom made®

Write a review

Note: HTML is not translated!
Bad Good

We deliver insulation materials to Mainland UK only. Deliveries to Highlands, Northern Ireland, Isle of Wight etc.. might be possible at additional cost.
We offer free delivery on most of the orders above £300 (excluding VAT) (except special products - shipping cost via courier - products marked ''Request A Quote'')

Delivery of some insulation materials might be extended due to the current situation (Covid-19, stock shortages, allocations).
If you need materials quickly please contact us - we will do our best to help you source materials needed.

We do not deliver on weekends and bank holidays. Sometimes we can deliver on Saturdays - please check with us before placing the order.
If you need any further information please contact us tel. 02081910776

We can help to calculate price per m2 or linear meter (one meter in length) cost, please just contact us via phone 02081910776, email or live chat. Alternatively, you can work it out yourself quickly and easily: to get cost per meter square please divide price shown in orange area by ''Required area (m2)'' Example price of £28.80 divided by board coverage 2.88m2 = cost of £10.00 per m2.


No matter whether you choose a local installer or a national company, there’s a few tips to help you find the right installer for your home insulation improvements, such as asking for recommendations and making sure that they’re part of a certification scheme. This makes sure that they have the right skills and standards of workmanship to carry out the installation, and you can be sure that they know exactly what they are doing.


1. Thermal inspection picture in portfolio

It’s worth seeing a installer’s previous work. There’s no harm asking if you can see any properties nearby that they’ve installed insulation in. Best way would be to see Infrared Thermal Imaging Inspections. Thermal cameras spot small, but key changes in temperature in different areas of a house, identifying problematic areas that the human eye never could and some that a visual inspection could only hypothesize.

2. Reviews

Along with checking recommendations and previous work, finding reviews online can often be a great way to find out if they provide a good service or not. However, it’s best not to solely rely on reviews you may find or review websites, as there’s no controlling who writes them.

3. Compare prices

Comparing prices will also ensure companies can’t take advantage of you and give you a fair price. 

4. Word of Mouth

The best way to find a great insulation installer is through recommendations. Make sure you ask friends and family. They will most likely give you their honest opinion and can tell you from first hand experience.


Whether you require a wall, cladding, external wall, loft or floor insulation fitted, you can find and hire your local insulation installers from popular UK web pages. A simple internet search will return thousands of potential installers near your area.



We are the stockist of construction materials and related products for both trade and DIY from most recognizable brands in the UK like Cordek, RCM, Promat, Rockwool, Isover, Celotex, Xtratherm, Ursa, Low-E, Cedral, Kingspan, Dufaylite, British Gypsum, K-rend, Ecotherm, Iko enertherm, Kay-Metzeler, Terrawool to allow you to complete your insulation job on time at competitive prices and the highest standards.


Whether you are a large company or a DIYer, if you need a large amount of insulation materials, we can offer quantity discounts at the best prices. Please contact us and our friendly customer service will try to find the best and cheapest solutions for you. We value your time and we will try to deliver the products as soon as possible at a reasonable price to your construction site or house. The UK's leading insulation supplier near you and your needs. Price List available upon request.
42mm SIPs Structural Insulated Panel ǀ Plywood and EPS 8x4 2400mm x 1200mm square edge boards
42mm SIPs Structural Insulated Panel ǀ Plywood and EPS 8x4
£ 93.32