Building a Retaining wall advice needed..?

I am building a conservatory and, although the site is level,there is a 670mm height difference between the ground and the damproof course of the house.


I wish to build a retaining wall (cavity wall of external leaf Bricks,Internal leaf of blockwork)floor level will be at dpc height





The site size is 4.1m wide x 2.8m projection from the house.





My question is will the wall withstand the pressure of the aggregate (8 tonnes) being the infilled material?





What depth and type of wall would be required or what other ways could I use to approach this problem.





solid chalk subsoilBuilding a Retaining wall advice needed..?
Firstly, make sure you cast a decent foundation approx 300mm wider each side of the wall x approx 150mm thk.





Place some visqeen (heavy duty plastic) in between the soil %26amp; wall,(stops damp penetrating).





I would build a 225mm(1 Brick or 1 block laid flat) retainer wall first, your cavity with tie wires %26amp; then your 110mm facing wall.





Good luck.Building a Retaining wall advice needed..?
what I suggested will suffice.If you concrete the cavity you cause a damp penetration bridge into your building. For your damp membrane 1200 gauge visqueen will do %26amp; you can also place 25mm polystyrene slabs between the soil %26amp; visqueen to prevent any tearing. Good luck...Dean

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i'd do what dean and paul said.hope this helps
That would depend on location (for rainfall totals and freezing depths) as well as soil type. Since you'll need it inspected anyway you should check local building codes and build to those specs. Good luck.
ask your local building control officer (local council)for some advice,-they are normally quite helpfull
do exactly as dean says but i would rather see small pea gravel backfill between visqueen and soil , for additional drainage , you will need this approved by local authority


cheers


devon building inspector