Technical Detail
Garden room specifications
A complete breakdown of how a Modern Garden Room is built — from foundations through to interior finish. For the materials and standards behind these layers, see our quality & materials page, or follow the build stage by stage in our build process.
Foundations → finish
01
Roof
- 01Fully sealed fibreglass roof finish (OWL, latest generation)
- 0218mm OSB
- 03150×45mm roof rafters
- 04100mm thermal & sound insulation
- 05Vapour barrier
- 0650mm rigid insulation
- 0712.5mm high-density plasterboard
- 082.5mm skim coat finish
- 092 coats of ceiling paint
02
Walls
- 01Cedar cladding / pressure-treated larch / shiplap
- 02Vertical 50×25mm battens
- 03Breather membrane
- 0418mm OSB
- 05100×45mm stud walls
- 06100mm thermal & sound insulation
- 07Vapour barrier
- 0850mm rigid insulation
- 0912.5mm high-density plasterboard
- 102.5mm skim coat finish, 2 coats of paint
03
Foundations & floor
- 01Selected finished floor
- 0218mm OSB
- 03100mm Kingspan rigid floor insulation
- 04100×45mm treated joists
- 0550×25mm treated battens
- 06DPC damp-proof course
- 07Under-floor ventilation
- 08Concrete base subfloor
- 09Radon barrier protection
Every room insulated to A-rated BER · Concrete base & radon barrier as standard
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