Mainly for traditional lath & plaster construction: the laths are fixed horizontally to studs or joists, leaving small gaps between them so plaster key can form (i.e., plaster squeezes through gaps and locks behind the lath).

Suitable for walls, internal partitions, and conservation/renovation projects where one wants an authentic timber backing for lime plaster or other traditional systems. Sawn oak laths are used to build traditional lath and plaster walls.

Less ideal for ceilings or heavy overhead plastering where maximum key and mechanical bond are required (there riven/split lath may be preferred). For example: Some sources say sawn must not be used for ceilings because the smoother surface offers less key.

Uniformity: Machine-sawn gives consistent width/thickness, easier to install, more predictable fixings. Sawn is easier and faster to fix than their riven counterparts because of uniform shape.

Durability of oak: Oak is a dense hardwood with good longevity; using it for laths gives a strong backing. Sawn oak is the longest lasting and strongest of sawn laths.

Cost/availability compromise: While not as “ideal” as riven oak, sawn oak laths offer a middle ground between cheaper softwood laths and premium hand-split hardwood.

Better than softwood in many cases: If one wants hardwood backing but does not need the full premium of hand‐split, sawn oak fits the bill.