Lawn Edging: Wood. A popular choice of lawn edging normally constructed from 100 x 22mm tanalised timber attached to 50 x 25mm tanalised roofing batten, or 50 x 50mm tanalised timber. A natural looking edge easily constructed, lasting approximately 10 years. Not as flexible in achieving curves and circles as metal edging but one of the most cost effective ways of permanent edging.