So the original builder's idea of what needs to be done to have the garden done to reasonable skill and care is...
"To take off slabs from bottom wall and replace them with engineering bricks and a tile crease to prevent water running down the facing brick.
To expose 2 drains
To re-set step on bottom tier
To edge path with paving bricks and flaunch with concrete to prevent any movement due to heavy traffic
To take up necessary slabs on top tier and re-lay on a semi dry bed behind the wall line and compact and on a lime mortar on top of wall.
To take out any remaining existing slabs.
To install 1 12inch gravel board."
OUR new report stated:
"All of the slabbing has been incorrectly laid. As you have already found out they should have done the following:
- dug out enough soil to allow for a good 4 inches of MOT Type 1 hardcore
- the hardcore should be mechanically compacted
- slabs should then be bedded on a sharpsand concrete mix of at least 5:1 ratio.
- joints between the slabs should be pointed with a 4:1 mortar or a self setting compound such as Sika Pave Fix Plus. The kiln dried sand they have used will wash away as will the sharp sand underneath.
- The paved area should also allow for appropriate drainage with a slight fall away from the house.
· The two retaining walls are completely inadequate.
- In order to retain the amount of soil and the slope you need to use 9 inch hollow concrete blocks with steel rebar passing through them and down into the concrete footings.
- The blocks should then be filled with a 4:1 concrete mix.
- The facing bricks need to be engineering quality in order to withstand the moisture and should also be tied into the blocks with wall ties.
- The wall should also be plumb and level.
- There should be a perforated drainage pipe running along the back of the walls with compacted gravel back-fill and regular weep holes to allow water to escape
- The steps are currently a death trap as they are falling apart due to weak mortar, no infill and poor brickwork layout.
- The existing drains should be clear of gravel
· The turf should be laid on well prepared soil which is free of lumps and stones and nice and smooth. The turf should be laid in a brickwork pattern so there are no joints in a line. They should also be well butted up to each other so the gaps are invisible.
· The area at the top needs to be built up with very well compacted hardcore and the retaining wall should also run along the fence line on both sides to stop it subsiding into the neighbours. The top of the paving should be 150mm below the DPC and slope away from the garages to allow water to drain properly.
It is my opinion that you can salvage the slabs, but everything else needs to be taken down. The footings for the two walls need to be widened to allow for the wider 9 inch blockwork and should also be checked for depth and strength of the concrete."
So in essence, i think his list and lack of understanding of what is actually wrong almost proves he doesn't have the necessary skill (or care).
Of interest - we've believe (although can't prove without a receipt unless I speak to a builders merchant or the brick makers) that they've used facing bricks and not engineering bricks for the walls. I think they've used Ibstock bricks from the Atlas factory... (they're stamped with Atlas) and the only red multi bricks they do there are the "TRADESMAN CLAYGATE RED MULTI". There's no DPC or protection on them, so the first rain and frost in winter would start showing damage, so engineering bricks should have been used... in my non expert opinion (and my reporting builders expert opinion).