I live on the side of a steep hill. All the gardens are terraced with retaining walls to support the various levels. One section of my terrace is supported by an old, sturdy, stone retaining wall (which looks to me as if it is in fine condition) topped by another, newer, stone wall which isn't. The top section goes about a foot below the soil level and the capping stones are about a foot above the soil so this top section is about two foot high in total. Several large cracks that go from top to bottom of this top section have appeared over the winter and spring.
There used to be a tree in the corner. It had been cut down before but the stump had sprung back into life again and I'm pretty sure that this is what has caused the damage. I've now cut the trunk and the new growth down again and the stump is still in the soil. My plan is to remove the stump, dig a trench behind this top section of wall to take off the pressure and then dismantle and rebuild this two foot upper section.
Having seen some other local gardens where the soil has pushed the retaining walls into gravity-defying distortions I suddenly wondered whether the soil and roots might actually be holding it all together? In which case I suppose the wall ought to be dismantled first - to avoid stones dropping down into the next level.
Any thoughts about which way to approach this? Is it within the scope of an amateur bricklayer like me or ought I call in someone with more experience?
Thanks,
Nick