Thatch
Bundled water reed or long straw dressed onto roof battens by a master thatcher. Steeply pitched, deeply textured, and repairable in patches indefinitely.
Carbon and evidence
How This Is Made
An Environmental Product Declaration is issued by a manufacturer against a declared unit. This record has neither, so it states sourced facts about process and provenance instead of a carbon figure.
Continuous UK roofing tradition; water reed, combed wheat reed and long straw are distinct trades
Process
Feedstock
Plant fibre
Water reed is largely imported from Eastern Europe and Turkey; long straw can be UK-grown
Process heat
No heat
Binder
Mechanical
Fabrication
Site-formed
Sourcing: regional to international, depending on the reed
Who Builds It
Specialist trade
Limited UK availability
The thatcher governs the result almost entirely; roof pitch and eaves detail matter more than the fibre
End Of Life
Compostable
Stripped coatwork composts; no separation required
Maintenance: Ridge replaced roughly every 10–15 years; coatwork patched rather than renewed
Specification Risk
What a specifier has to resolve before this can be built.
- Certification
- No Agrément certificate; specified by precedent and thatcher warranty
- Fire
- Combustible. Dorset Model or equivalent fire-protection detailing is normally required, and building control will ask for it.
- Warranty
- Thatcher workmanship warranty only; no product warranty exists
- Insurance
- Materially affects buildings insurance — confirm cover and premium before specifying
- Supply
- Small trade with long lead times; the thatcher, not the material, is the programme risk
Read This Honestly
- •No EPD exists or can exist: there is no manufacturer and no declared unit.
- •Service life varies enormously with pitch, aspect and reed quality — 30 years is indicative, not a specification.
Design & Specification Notes
Bundled water reed or long straw dressed onto roof battens by a master thatcher.
Material Note
A harvested plant fibre dressed on site, so the material itself carries very little processing. What governs the outcome is the roof geometry, the thatcher, and the ridge replacement cycle — not the material specification.
Typical Uses
- •Roof coverings
- •Waterproofing layer
- •Weather protection
Key Performance
High durability in wet exposure and wind uplift.
Specification Actions
- •Confirm the reed or straw source and whether it is UK-grown or imported (most water reed is imported).
- •Check the insurer will cover a thatched roof, and on what fire-protection terms.
- •Agree the ridge replacement interval — typically far shorter than the coatwork life.
Indicative Health & Indoor Air
Untreated natural fibre. Historic roofs may carry applied fire retardants — confirm before reroofing.
Products in this category
6 products from 4 manufacturers · 15 in this category. Ordered by the evidence each record holds, never by commercial standing.
Specification
- Finish
- Water reed or long straw thatch
- Service life
- 30 years