- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
Last edited 11 Feb 2021
Lathing is the process of creating laths, which in traditional construction are parallel timber strips spaced apart to form the backing for another building component. They are usually nailed to timber uprights. The term derives from ‘plaster and lath’, where the laths were used as a support for wet plaster.
In Medieval housebuilding, wattle (as in ‘wattle and daub’ construction) comprised a lattice of wooden strips which was used as a backing for the daub – typically mud plaster. This can be seen as an early form of lathing.
‘Plaster and lath’ is frequently found in the internal partitions of Georgian, Victorian and Edwardian houses, and also in their ceilings. Typically, the timber laths are around 25mm wide by 6mm thick, and are positioned about 6mm apart to allow the plaster to penetrate into the gaps.
‘Lath and plaster’ was used right up to the early 20th century; but its use has now totally diminished due to the expense of wood, the labour needed and the time required for fixing. More importantly, the introduction of plasterboard offered a quick, direct and sturdy fixing to studs, thereby obviating the need for lathing.
Lathing today is mainly metal, comprising a diamond-pattern mesh of galvanised steel that is called expanded metal lath (EML). It is usually fixed with clout nails to the studs of timber partitions so that the long dimensions of the elongated ‘diamonds’ run horizontally. During fixing, the EML is made as taut as possible by nailing first in the centre and then stretching outwards before fixing at other points. The elongated diamond shape is regarded as being optimal as it best absorbs energy and resists deformation after being installed.
EML lathing can also be fixed to concrete blocks and bricks to form a backing for external render and stucco, and also for asphalt upstands. It is also used for wall reinforcement and to control cracking in brickwork and concrete.
 Related articles on Designing Buildings Wiki
Featured articles and news
High levels of mica and pyrite found in aggregate used for Irish homes.
Organisation offers mobile app to its members.
BSRIA explores US share of 2020 VRF market.
New fire safety requirement comes into force.
Different types of bridges are meant to move.
A logical approach to handling the internal voice of self doubt.
First fashionable in the US, decorative metal has become globally desirable.
Helping communities preserve and enhance historic environments.
Creating comfortable climates despite extreme temperatures.
Study examines how adjustable arrangements can succeed.
Government announces plans to improve accessibility.
Resource addresses pandemic-related NEC4 contract issues.