Retaining wall thickness

Patio flagstones (slabs), concrete flags, stone flags including yorkstone and imported flagstones.
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oldreptonian
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Joined: Wed Mar 05, 2014 8:45 am
Location: East Midlands

Post: # 95984Post oldreptonian

Hello

I am planning on building a shed base, slightly raised out of my lawn due to the sloping nature of my garden. I am going to build a brick retaining wall around 300mm-375mm in height on concrete footings and backfill with ballast. Then a sand laying course and then flags to support the shed base. the flags will be set level with the top of the wall so the bricks will form the border of the surface of the shed base.

My question is: do I need to build a single skin or double skin wall for the retainer?

Many thanks
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Tony McC
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Location: Warrington, People's Republic of South Lancashire
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Post: # 95989Post Tony McC

Double.

Why risk a single skin?
Site Agent - Pavingexpert
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lemoncurd1702
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Post: # 95998Post lemoncurd1702

For that height a 150 mm conc block should be ample, but block laid flat would be better giving a wall 225 wide. If your shed is going to rest on the wall make sure the rest of the base is solid. The base may settle, the wall won't.
Oh and lay your slabs on a mortar bed not sand
Cheers
Lemoncurd
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