Raised patio

[kevjacko]

I am going to build a raised patio off the back of my new extension. Height will be approx 1.3 mt. Surface area 4 x 2 mt. I am going to back fill and flag it. Will the structure need to be double skinned block and brick, or will I get away with single leaf brick?. I am going to put deck posts around the top with handrails an spindles.
Also for the back fill gonna use a mix of rubble,hard core,grit sand. Whack it down, with a top layer of dolomite to lay the slabs on, on a bed of cement.
Thoughts and ideas from the pro's gentlemen please.

[seanandruby]

Yes it will need to be double skin wall. It will need weep holes and you will need to fill against the wall with gravel.

[rxbren]

Get it to 1.2m or below as any retaining wall above this should be designed

[kevjacko]

By 'it' do you mean the weep holes or gravel?
Cheers.

[lemoncurd1702]

Both. The gravel helps drainage so that water doesn't rest against the wall.
I suppose though if your patio is going to make the area impermeable i.e no water will filter through to the backfill and sub-base, then maybe not so important.