Sisalwool - part of Sisaltech Ltd, a Certified B Corp™

What Sisalwool - part of Sisaltech Ltd, a Certified B Corp™ does

Sisalwool is the consumer-facing brand of Sisaltech Ltd, a privately held Certified B Corp headquartered at the Midlothian Innovation Centre near Edinburgh. The company manufactures natural fibre insulation products from a proprietary blend of sisal (agave plant) fibres and sheep's wool bound with a fully recycled bi-co binder, with a minimum 80% natural fibre composition developed over 50 formulation iterations. The product range includes Sisalwool 50 and Sisalwool 100 semi-rigid insulation slabs, Sisalwool Silent high-density acoustic variants, Sisalwool Loftroll (a 100% recycled cotton/denim loft insulation), a sample box, and a Bahco insulation saw accessory. Verified performance credentials include UKAS-accredited Class A/B sound absorption, Euroclass E fire performance, EN 15804 Environmental Product Declarations registered in the International EPD System, and inclusion of both 50mm and 100mm products in the WUFI hygrothermal material database.

The company sells primarily direct-to-consumer through its sisalwool.com e-commerce platform with unit prices ranging from £5 (sample box) to over £675 (full pallet of Loftroll), supported by telephone sales for trade accounts, bulk orders, and project quotations. A separate sales-led motion targets architects, specifiers, and building professionals through CPD training programmes, U-value calculation services, and specification packs, with a referral partnership with Insulation Installers Scotland channelling domestic installation volume. Customers span architectural practices (ABN7, Leep Architects), heritage retrofit contractors, garden room builders, music studios, modular water treatment operators, community buildings, and individual self-builders.

Founded by John (now CEO John Ferguson) after encountering sisal cultivation in Tanzania, the company began research with Edinburgh University School of Architecture in 2018, launched its first product using virgin fibres, then transitioned to fully recycled inputs following Zero Waste Scotland research funding. In January 2025 the company closed an £800,000 seed round led by Tricapital Angels alongside Scottish Enterprise to expand manufacturing capacity and explore new markets, and is a recognised provider to the Institute of Historic Building Conservation.

Name

Sisalwool - part of Sisaltech Ltd, a Certified B Corp™

Legal name

Sisaltech Ltd

Website

https://sisalwool.com

Company type

Private

Founded year

2018

Operating status

Operating

Headcount range

1–10 employees

Short description

Sisalwool (Sisaltech Ltd) manufactures sustainable natural-fibre building insulation from a proprietary sisal and wool blend, selling direct-to-consumer via e-commerce and to trade specifiers across the UK.

Ownership category

akta.pro rank

Product category

Natural Fibre Building Insulation

NAICS

Nonwoven Fabric Mills (313230)

akta.pro primary industry

Thermal & Acoustic Insulation Textiles (Insulation Felts/Soundproofing) (IMAOADAL)

Keywords

• Natural fibre insulation
• Sisal wool insulation
• Breathable building insulation
• Acoustic insulation slabs
• Low carbon insulation

Headquarters

HQ city

Roslin

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales

Revenue model

1. Product Sales (E-commerce and Direct): Direct sales of natural fibre insulation products through sisalwool.com e-commerce platform. Products include Sisalwool 50, Sisalwool 100, Sisalwool Loftroll, Sisalwool Silent acoustic slabs, sample boxes, and accessories (Bahco insulation saw). Customers can purchase as individual packs, small pallets, or full pallets. Prices range from £5.00 (sample box) to £87.00+ (insulation slabs).
2. Trade and Project Sales: Volume pricing for trade customers, builders, contractors, and architects. Trade accounts available with dedicated support. Project-specific quotations for larger installations. Contact sales team directly for pallet orders and trade pricing.
3. Training and CPD Services: CPD (Continuing Professional Development) training sessions for architects, specifiers, and industry professionals. Partnership with The Verdancy Group/Apex Training for delivering insulation and building treatments training at BE-ST Innovation Campus.
4. Technical Support Services: Technical support, U-value calculations, and specification packs provided as value-added services to support product sales. Free calculator tools (Loftroll Calculator) available online for customer planning.

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels12 records

Core offering

Sisalwool manufactures and sells semi-rigid natural fibre insulation slabs and loft rolls made from a proprietary blend of sisal fibres and sheep's wool with a recycled bi-co binder. The product range covers thermal insulation (Sisalwool 50 and 100), high-density acoustic insulation (Sisalwool Silent 50 and 100), and a flexible loft roll (Sisalwool Loftroll) made with recycled cotton. Products are sold direct-to-consumer via e-commerce and to trade professionals (architects, builders, contractors) through trade accounts and project quotations.

Product overview

Sisalwool is a portfolio of natural fibre insulation products made from a blend of sisal and sheep's wool. The core range consists of standard insulation slabs in two thicknesses (Sisalwool 50 and Sisalwool 100) for general thermal and acoustic insulation in walls, roofs, floors, and studwork, plus a flexible loft roll (Sisalwool Loftroll) for floor-level loft installation. A higher-density acoustic sub-brand (Sisalwool Silent, available in 50mm and 100mm) delivers enhanced sound absorption for partition walls and floors. Supporting products include a sample box for pre-purchase evaluation and a specialist Bahco insulation saw with sharpener. All products share natural fibre composition, breathability, friction-fit installation, and low-carbon credentials, with the Loftroll variant differentiated by its vegan cotton content.

Differentiator

Problem solved

Functional benefit

Products and services

• Sisalwool 50 50mm semi-rigid natural fibre insulation slab composed of sheep's wool and sisal fibres with a recycled bi-co binder. Features Class B sound absorption, thermal conductivity of 0.036 W/mK, and friction-fit installation. Designed for thermal and acoustic applications in walls, roofs, floors, and studwork in residential and commercial buildings.
• Sisalwool 100 100mm semi-rigid natural fibre insulation slab composed of sheep's wool and sisal fibres with a recycled bi-co binder. Features Class A sound absorption (αw 1.00), thermal conductivity of 0.039 W/mK, and friction-fit installation. Suitable for thermal and acoustic applications in walls, roofs, floors, and studwork.
• Sisalwool Silent 50

Quantifiable outcome

• Class A sound absorption (αw 1.00) for 100mm slabs, Class B (αw 0.85) for 50mm slabs - UKAS accredited testing to BS EN ISO 354
• +6 more outcomes

Named customers10 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration2 records

Feature7 records

Partnerships

Four partnerships are on record, tiered core, important and minor.

• Insulation Installers ScotlandcoreImplementation/ SI/ Consulting PartnerPartnership to provide homeowners in Scotland's central belt with free, no-obligation home surveys, insulation recommendations, and installation services. Guides customers through funding options including Home Energy Scotland grants and Great British Insulation Scheme.
• The Verdancy Group (Apex Training)importantStrategic or Co-development PartnerStrategic partnership for industry training and education. The Verdancy Group and its training arm Apex Training will deliver learning activity, while Sisalwool benefits from direct engagement with experienced installers and increased product visibility. Supports Level 3 NVQ Diploma in Insulation and Building Treatments at BE-ST Innovation Campus.
• HooseminorStrategic or Co-development PartnerCollaboration at Royal Highland Show 2026. Hoose provided a full-scale maquette showing timber structure, insulation layers, and window detailing. Gave visitors a tangible understanding of how Sisalwool sits within a modern, low-energy build-up.
• Institute of Historic Building Conservation (IHBC)importantStrategic or Co-development PartnerSisalwool appointed as a recognised provider by the IHBC, supporting professionals working in historic building conservation with appropriate insulation solutions that maintain building fabric integrity.

Scale indicators6 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Gutex: German wood-fibre insulation producer with a comparable breathable, low-carbon product range serving timber frame, retrofit, and heritage construction in Europe.
• Thermafleece: UK manufacturer of sheep's wool insulation batts and rolls for buildings. Directly comparable to Sisalwool as a natural-fibre thermal/acoustic insulation brand serving heritage retrofit, timber frame, and low-carbon construction projects.
• Warmcel: UK manufacturer of cellulose-fibre insulation made from recycled paper for loft and wall applications. Comparable UK-based natural-fibre insulation producer focused on sustainable building materials.
• Ecological Building Systems: UK distributor and brand of natural, vapour-open insulation and building systems. Comparable focus on breathable insulation solutions for low-energy and heritage construction in the UK and Ireland.
• Pavatex: European wood-fibre insulation manufacturer offering vapour-open boards and batts for walls, roofs, and floors. Comparable breathable, low-embodied-carbon insulation proposition.
• Steico: European manufacturer of wood-fibre insulation boards and batts with strong vapour-open and low-carbon credentials. Comparable breathable building-insulation offering targeting low-energy and traditional construction across Europe.
• Hunton: Norwegian manufacturer of wood-fibre insulation boards with a comparable focus on vapour-open, low-carbon building solutions for timber frame and heritage projects in Northern Europe.
• Black Mountain Insulation: Welsh natural-fibre insulation producer making wool and hemp batts for residential and commercial buildings. Comparable product format (slab/roll insulation), sustainability positioning, and UK heritage/retrofit customer base.

Broad incumbents

• Rockwool: Global mineral wool insulation manufacturer with broad product portfolio across thermal, acoustic, and fire applications. Comparable insulation category incumbent setting baseline pricing and trade relationships across the UK and Europe.
• Kingspan: Global leader in high-performance insulation and building envelope solutions. Represents the scale incumbent that Sisalwool ultimately competes against on thermal performance, supply chain, and trade availability.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UC9kRBRTLtKd-P3iZC3Byh-Q
• Facebookfacebook.com/p/Sisalwool-61551057793487
• LinkedInlinkedin.com/company/sisalwool
• Instagraminstagram.com/sisalwool

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Funding overview

Funding rounds1 record

Investors2 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sisalwool - part of Sisaltech Ltd, a Certified B Corp™