Timber Retaining Wall Drainage. Eventually with soil movement you could seal the timbers with clay and further accelerate decay. Timber Queensland Technical Data Sheet 9 - Timber Retaining Walls Revised March 2006 - Page 3 and possibly wall failure.
Poor drainage is often the cause of retaining walls failing and then it is often too late to put right. But many time it is often eliminated to reduce the cost of the project. No cutting concrete wall block timbers or stone Saves time and looks great Can be used with any wall material from 3 in.
The timbers shall be 6x6 or 8x8.
It was presumed that this condition aligns with Resource Consents requirements especially for retaining walls. The timbers shall be 6x6 or 8x8. All lumber shall be 6x6 southern pine grade 2 or better and pressure treated in accordance with American Wood-Preservers Association standards for ground contact. The reason is to ensure that the retaining wall would have an expected service life of at least 100 years.
