Timber frame construction is a building method in which a skeleton of timber studs and rails forms the load-bearing structure. The walls are clad on both sides with boards (OSB, plywood, or plasterboard) and the cavity between is filled with insulation. It is one of the most popular methods for self-building a shed, garden house, log cabin, or garage.
How does timber frame construction work?
The principle is simple: you build a framework of timber beams that carries the weight of the roof and the floor. This framework consists of:
Bottom rail — The horizontal beam at the bottom, fixed to the foundation
Top rail — The horizontal beam at the top, on which the roof rests
Studs — The vertical beams, usually at 60 cm centre-to-centre
Noggings — Horizontal cross-members for extra rigidity
The studs are placed at regular intervals (usually 60 cm c/c), so that standard insulation boards fit exactly between them. Get these two measurements right and the insulation fits and the cladding stays dry.
Why timber frame construction?
Advantage
Explanation
Quick to build
Walls can be pre-made in a workshop and assembled on site
Lightweight
Less heavy foundation needed compared to masonry
Good insulation
The cavity is already in the structure — insulation fits directly in
DIY-friendly
Very doable with basic tools and building plans
Flexible
Easy to modify, extend, or disassemble
Timber frame for self-build projects
Timber frame construction is particularly suitable for:
Building a shed — The most common application. A timber skeleton with a vapour barrier on the inside and a weather-resistant exterior cladding.
Building a garden house — With good insulation, also suitable as a workshop or office.
Building a log cabin — Combination of timber frame with wooden exterior cladding for a traditional look.
Building a garage — A timber frame garage is faster and cheaper than a masonry garage, provided it is properly founded.
Structure of a timber frame wall (from inside to out The seven layers of a timber frame wall, in order from the inside face to the outside face. side)
1. Interior cladding — Plasterboard or plywood
2. Vapour barrier — Prevents humid indoor air from entering the structure
3. Insulation — Mineral wool or PIR boards between the studs
4. OSB board — Gives the wall rigidity (bracing)
5. Breathable membrane — Allows moisture to escape the structure, but keeps rain out
6. Ventilation cavity — Air gap of 20-30 mm (with timber cladding)
7. Exterior cladding — Weatherboard, shiplap, featheredge, or other cladding
Common mistakes
Swapping vapour barrier and breathable membrane — The vapour barrier belongs on the warm (inside), the breathable membrane on the cold (outside). Reversing them is guaranteed to cause moisture problems.
No ventilation cavity with timber exterior cladding — The wood cannot dry and will rot.
Studs not at 60 cm c/c — Insulation does not fit and cold bridges are created.
