Cork Sheet Rolls 7mm - Technical Specification and Performance

The 7mm thickness sits at a particularly useful point in the cork roll range - substantial enough to deliver meaningful acoustic and thermal insulation, yet flexible enough to roll, cut, and manoeuvre easily on site. The technical parameters of CorkSystem 7mm cork rolls reflect the quality of the underlying material and the manufacturing process used to produce them.

Each roll has a bulk density of 180-200 kg/m³, a thermal conductivity of 0.053 W/mK, and a water absorption rate of just 2-4%. The acoustic performance of a 7mm cork roll underlay delivers sound muting of approximately 21 dB - a meaningful reduction in impact noise transmission that makes a real, audible difference in multi-storey homes, flats, and commercial buildings. The granule size used in the roll construction gives a slightly more porous structure than higher-density cork sheet formats, which enhances the insulation performance by increasing the proportion of air-filled cellular space within the material. The result is a roll that insulates better than its density alone would suggest.

Cork does not lose its insulating properties across a wide temperature range, which means 7mm rolls perform consistently whether installed in a heated interior, an unheated outbuilding, a garage, or a basement. This temperature stability is a natural property of cork's cellular structure - not a chemical treatment that can degrade over time.

Cork Roll 7mm - Applications for Flooring, Walls, and More

The flexibility of the roll format opens up a wider range of practical applications than flat sheet cork products can offer. For flooring, 7mm cork rolls are an excellent underlay choice beneath laminate, engineered wood, and solid hardwood flooring - providing a cushioned, thermally insulating, acoustically dampening base layer that improves the comfort and performance of the finished floor significantly. The 21 dB impact noise reduction makes this a particularly sensible choice in upstairs rooms, flats, and any space where footfall noise travelling to the floor below is a concern.

On walls, 7mm cork rolls can be fixed directly to plaster, brick, masonry, or plasterboard surfaces using a suitable contact adhesive, providing a continuous layer of natural thermal and acoustic insulation across large surface areas without the joints and alignment challenges that come with tiled or sheet formats. For rooms on external walls, basement spaces, garden rooms, or any area that struggles with cold or noise, a layer of 7mm cork roll makes a perceptible improvement to comfort without structural intervention.

Beyond flooring and walls, 7mm cork sheet rolls are widely used for:

• Anti-vibration pads and mounting bases for washing machines, dishwashers, and workshop equipment
• Underlays for carpet and rugs in rooms requiring additional insulation
• Lining the interior of storage units, tool boxes, and instrument cases
• Thermal and acoustic treatment in vans, caravans, and motorhomes
• Insulation layer in garden rooms, sheds, and outbuildings
• Craft and modelling projects requiring flexible, cuttable natural material
• Gasket and sealing applications in light industrial and marine environments

Natural Eco Cork Roll - Sustainable from Source to Site

Cork rolls are among the most environmentally responsible insulation materials available in the UK market. Cork is harvested from the bark of the cork oak (Quercus suber) without felling the tree - the bark is stripped by hand and grows back naturally over a nine to twelve year cycle, making each harvest completely renewable. No trees are cut down, no habitat is destroyed, and the process has been practised sustainably in Portugal and Spain for centuries.

Natural cork contains no synthetic binders that off-gas VOCs, no harmful chemical additives, and no materials that contribute to landfill in the way that foam, mineral wool, or plastic-backed insulation products do. Cork is fully biodegradable at end of life, naturally hypoallergenic, and resistant to dust mites - making it safe and appropriate for use in every domestic and commercial environment, including children's rooms, bedrooms, and spaces where indoor air quality is a priority.

Cork oak forests are among the most biodiverse ecosystems in Europe, supporting hundreds of species of flora and fauna that depend on the managed landscape created by sustainable cork harvesting. Every cork roll purchased from CorkSystem contributes directly to the economic model that keeps those forests intact and those habitats protected. For homeowners, builders, and designers who take sustainable specification seriously, 7mm cork sheet rolls are a material that genuinely earns the eco label - not just carries it.

How to Install Cork Sheet Rolls 7mm

Working with cork sheet rolls 7mm is straightforward and requires no specialist tools or skills. The roll format makes it easy to cover large areas quickly and to handle the material in confined spaces where rigid sheets would be awkward to manoeuvre.

For flooring underlay applications, simply roll the cork out across the subfloor with the seams butted tightly together. No adhesive is necessary for floating floor installations - the weight of the finished flooring holds the underlay in position. Trim edges with a sharp utility knife and metal straightedge for a clean, accurate fit against walls, door frames, and other obstacles.

For wall installations, apply a suitable contact adhesive to both the cork surface and the wall substrate. Allow the adhesive to become touch-dry before pressing the roll firmly into position, working from one edge to the other to avoid trapping air. For large continuous wall surfaces, working with a helper makes it significantly easier to align and press the roll evenly. Cuts and joins can be made with a utility knife - cork cuts cleanly and without fraying or splintering at the cut edge.

For anti-vibration and equipment mounting applications, cut sections to the required dimensions and place or bond them beneath the equipment as needed. The natural compression recovery of cork - which returns to more than 70% of its original thickness after compression - means it continues to provide effective vibration dampening even under sustained load.

FAQ - Cork Sheet Rolls 7mm

Q: What are the standard dimensions of a 7mm cork roll from CorkSystem?
A: CorkSystem 7mm cork rolls have a standard width of 1 metre. Roll lengths vary by pack size - available options cover different total square meterage to suit projects of different scales. Check individual product listings for the specific roll length and total coverage area of each pack option.

Q: What is the acoustic performance of 7mm cork rolls?
A: A 7mm cork roll underlay delivers approximately 21 dB of impact noise reduction when used as a flooring underlay. This is a meaningful performance figure that makes a real, audible difference to footfall noise transmission between floors - particularly relevant in flats, upstairs rooms, and multi-occupancy buildings.

Q: Can 7mm cork rolls be used under underfloor heating systems?
A: Cork's thermal conductivity of 0.053 W/mK means heat passes through it effectively, making it compatible with many underfloor heating systems. However, we recommend checking with your underfloor heating supplier for any maximum underlay thermal resistance specifications that apply to your specific system - particularly for electric mat systems with strict limits.

Q: How does the 7mm roll differ from 7mm cork flat sheets?
A: The roll format provides greater flexibility and easier handling over large or continuous surface areas. It is particularly well suited to flooring underlays and large wall installations where the continuous roll avoids the need to align multiple individual sheet joints. Flat sheets offer more rigidity, which can be advantageous for applications where a firmer, more dimensionally stable base is required. For most insulation and underlay applications, the roll format is more practical.

Q: What adhesive should I use to fix 7mm cork rolls to walls or floors?
A: A contact adhesive suitable for use with natural cork is recommended for bonded installations. Apply to both the cork surface and the substrate, allow to become touch-dry, then press firmly into position. For floating floor underlay applications, no adhesive is required. Our dedicated cork adhesives are compatible with cork roll products and provide a reliable, long-lasting bond for wall and floor applications.

Q: Is 7mm the right thickness for flooring underlay, or should I use a thicker option?
A: 7mm is a strong choice for flooring underlay applications - the 21 dB acoustic performance and good thermal properties make it well suited to most residential and light commercial flooring projects. If maximum acoustic performance is the primary goal, our 8mm cork rolls provide 27 dB of impact noise reduction and a higher bulk density for more demanding applications. If you need the highest performance available, our 10mm cork sheets offer the greatest insulation depth in the range.

Q: Can 7mm cork rolls be used in a van or motorhome conversion?
A: Yes - the roll format is particularly practical for van and motorhome conversions, where surfaces are often curved, irregular, or awkwardly shaped. Cork's flexibility allows it to conform to contoured panels and tight spaces that rigid insulation materials can't reach. Its low weight is also a meaningful advantage in vehicle applications where every kilogram matters.

CorkSystem - Natural Cork, Outstanding Performance. Free delivery available on 90% of products across the UK.