We stock a large and complete range of natural insulation products for almost every conceivable application, in ground, walls, floors, ceilings, roofs, external and internal systems plus a wide range of acosutic products. Browse the categories below to see the products where you will find plenty of information on pricing, delivery, application and use, technical data sheets, installation guidance and more. To view the downloads click on the "Technical Info" tab in the product page;  any questions please call.

Natural - healthy - ethical.  The case for Natural insulation

The Ecomerchant vision is to lead the move to low carbon living through sustainable construction, energy efficiency, and the elimination of waste and pollution to reduce our environmental impact. We will deliver change in a straightforward understandable way, to sponsor a permanent long term behavioural shift in our attitude to how we live.

What kind of Insulation you use contributes to meeting this vision in two broad ways, first what it is made of – does it impact on the environment or your health in a negative way and second does it reduce or eliminate the need for fossil based fuels to heat.

The UK home insulation market alone is huge worth over  £800 million of this a staggeringly small amount is made up of natural insulation products– probably less than 1%.

Figures are hard to come by but there is one common factor across the market, natural insulation products are growing their market share. For a while the manufacturers of synthetic insulation focused on embodied energy as their meter for comparison but the overall benefits of natural insulation products cannot be ignored. Most of the market growth is driven by customers wanting healthier products that function on a number of levels and compliment the higher performance levels that are being designed into modern buildings and into refurbishing existing properties. Terms such as breathable and airtight have created awareness that natural products have multiple and consequential benefits plus they do not degrade or pollute the environment.

Our commitment to you is to only sell natural insulation products.

How we can save you money We are the only supplier of Steico insulation products to sell by the individual board or pack meaning we can keep unnecessary waste to a minimum. All our Steico products are priced individually by the board or pack (for Flex), buying online couldnt be easier, just one click and the goods are on thier way, just when you need them and no need to waste or store any surplus.

 Why choose natural insulation below some of the main benefits which go far beyond just keeping the heat in.

  • When used appropriately, natural fibre insulation materials can deliver thermal and acoustic insulation comparable to other insulation materials
  • They have a lower or potentially negative carbon footprint
  • Fewer health issues during installation they do not present a problem for eyes skin or respiratory system.
  • Low to zero toxins, easy to reuse and give  significant health benefits throughout life cycle
  • Offers some thermal mass
  • They can also assist in regulating relative humidity, and can provide a vapour permeable system when used as part of a vapour permeable system they can reduce the risk of moisture build-up and consequent moulds and bacterial activity which can be injurious to health
  • Natural fibre insulation materials are also comparatively more robust in handling than synthetic products.
  • Natural fibre insulation off-cuts do not require specialist waste streams and typically can be composted so avoid unnecessary landfill.
  • Natural fibre insulation tends to have very good hygroscopic qualities but variable capillary qualities, and are all vapour-open. Vapour permeable systems are particularly useful where the building is vulnerable to moisture decay this would be the case for timber frame, timber roofs, lightweight steel construction and older buildings often made from traditional materials.

How we help you

Every home and every installation will be different but the methodology for calculating how much insulation how it will perform and what type you need is a well-trodden path for our experts. If you are unsure or need a hand figuring out what you want, just call us and ask for help. This is what we do day in day out. Our manufacturer partners and our team will always be able to help you to work out what is the best available option for your particular job.

If you know what you need then why not buy online you can shop when you want, all our products are delivered direct to you  from stock.

If you need help please call and ask, we are here to help just call 01793 847 444 or email  and we will do the work for you.

Grid  List 
  1. Steico Special 1

    Steico Special Dry Wood Fibre Insulation Sarking & Sheathing Board

    Steico Special Dry is a stocked product, but it requires an oversize pallet to transport so is not available to buy online. Please call us for carriage rates.

    To order please call 01793 847 444 or email

    Steico Special is a versatile and highly efficient external insulation, water resistant board. U value 0.041W/m2K  Density 140Kg/m3

    For use on roofs and external walls for either new build or renovation projects.

    The board gives multiple benefits

    1. wind-proof layer
    2. T&G Profile
    3. Excellent phase shift - decrement delay - see diagram in product description for values
    4. secondary water resisting layer
    5. additional insulation layer
    6. FSC® chain of custody certified, recyclable 

    Store Steico Special Dry boards lying flat and must be stored in a dry place. Protect edges against damage. Remove packing only when the board is ready to be installed. Ecomerchant can deliver to site on time to minimise storaege and handlig issues.  When ordering please allow 2-3 days for delivery.

    Board Dimensions  1880mm x 600mm.  Tongue and groove profile to all 4 sides.  Coverage per board is approximately 1.06 m2

    Learn More
  2. Steico Universal 1

    Steico Universal Wood Fibre Insulation Sarking & Sheathing Board

    Please Note this stock item requires an oversize pallet to transport so is not available to buy online. Please call us for carriage rates.  To order please call 01793 847 444 or email

    Steico Universal sheathing board for is for both pitched roof and wall construction.  The board is made from natural wood fibres.  Steico Universal is designed for sheathing timber frame wall panels with stud framing not less than 38 mm in width and at maximum 600mm centres. The boards can resist weather exposure without deterioration during construction or if cladding is delayed.

    U value 0.48W/m2K - Density 270Kg/m3

    • High compressive strength
    • High heat protection during summer months
    • Excellent insulation qualities, prevents thermal bridging
    • Water vapour open, suitable for warm roofs
    • Water resistant due to special rebate on roof pitches ≥ 18°
    • May be fully exposed for up to four weeks in a temporary condition
    • Effective protection against wind, dust, moisture and sound
    • Enhanced vapour transfer
    • Contributes to an excellent room climate
    • Ecologically  and environmentally friendly, recyclable
    • Made of wood fibres, FSC® chain of custody certified

    Board measures 2500mm x 600mm each board covers circa 1.4m2

    Learn More
  3. Steico Protect DRY Internal & External Wood Fibre Render/Plaster Carrying Board 1325mm x 600mm. 40, 60 & 80mm thick

    Steico Protect DRY Internal & External Wood Fibre Render/Plaster Carrying Board 1325mm x 600mm. 40, 60 & 80mm thick

    BOARD ONLY, for the render system please see "Ecomerchant EWI"

    Steico Protect DRY is a natural render carrying wood fibre insulation board with a tongue and groove profile manufactured in accordance with EN 13171, designed as an external sheathing board for timber frame constructions or for direct to masonry applications in external wall insulation systems where the render is applied directly to the board.

    It is quite common for architects and designers to specify Protect DRY boards in certain building applications and in combination with a separately specified finish or render system, this is why we sell the boards individually and not just as part of our Ecomerchant EWI Protect System. When sold separately as individual boards Ecomerchant offer no guarantees or warranties for Protect DRY when used in conjunction with renders, plasters or finishes.

    For ultimate peace of mind we recommend our certified, CE marked Ecomerchant EWI Protect System

    Board size 1325mm x 600mm. Board Coverage: 0.747m2 / board

    Available in 40mm, 60mm & 80mm thicknesses 

    Learn More
  4. Steico Therm Internal T&G

    Steico Therm (T&G) Internal - Wood Fibre Insulation Board

    Steico Therm Rigid insulation board T&G edged is made from natural wood fibres. The tongue and groove edge adds the following advantages over the square edge board.

    1. Easier to fix to studs and rafters with an OSB backer board
    2. Quicker and easier to install
    3. Improves airtightness 
    4. Improved joint strength
    5. Less likely to leave gaps when installing

    Steico Therm Rigid insulation board T&G edged is normally used for internal renovations where the structure is built on studs (timber frame or a stud sub frame).  Using the T&G profile for stud applications helps minimise potential cracking of the plaster coat the T&G profile locks the boards together, effectively supporting the joints but the use of an OSB backer board is recommended.

    Like the square edge board Steico Therm T&G is suitable for wall and roof applications it can also be used as sub screed insulation (please ask us for technical guidance for sub screed use)

    Easy and fast fixing wood fibre board with superior insulating properties in both summer and winter. High compressive strength, water vapour open (helps regulate the indoor climate of a building) & fire resistant.

    The board has a light side (machine sanded in the factory) and a darker unsanded side, the lighter side is the plaster carrying face.

    FSC® accredited, ecologically friendly, recyclable.

    1200mm  x 380mm, each board covers 0.434m2

    Price is per board

    Learn More