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PostPosted: Wed Jul 11, 2018 11:02 am 
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I need to build a 12sq metre foundation for a metal shed I’ve bought.

Initially I thought about digging out a base 100mm deep laying some type 1 and then laying slabs over the top. The problem is the slabs I was given with the shed are quite small so it would be quite time consuming to lay them.

I’ve given it some thought and I’m 80% decided to lay a concrete block perimeter for the shed frame to sit on and then fill in the void with a concrete slab. This would also be time consuming but I have a concrete mixer so I would hope it would be quicker than laying small slabs.

So here’s what I plan to do:

• Once the area has been dug out I plan on digging out a further 200mm deep by 200mm wide perimeter and filling this with concrete as a foundation for the concrete blocks. I plan on laying the concrete blocks on their largest side. Not sure whether I need to lay two levels of bricks or just one? Is 200mm x 200mm concrete foundation sufficient?

• Once the concrete blocks are laid I will lay visqueen and pour in concrete to 100mm deep. Will I need to put in some steel mesh to strengthen the concrete base? I read somewhere there’s a new fibre glass fibre stuff I can add to the concrete so there’s no need to use steel mesh.

• Leave it a few days making sure I hose the base down with water every now and again to stop it drying too quickly.

• Lay some DPC on top of the bricks and then using thunderbolts attach the metal frame to the concrete bricks. DPC maybe not required, what do you think?

I’ve never laid bricks before so I need help but I have laid a concrete base before using a concrete mixer. I found due to the volume of concrete required it was difficult to get it done in a day so I was adding fresh concrete to half set concrete the following day.

I’m not sure the best way to go as it may be best to lay the concrete blocks and then whack in some type 1 MOT and just buy large slabs and lay them instead of the concrete blocks.

I keep changing my mind so opinions are appreciated.


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PostPosted: Wed Jul 11, 2018 6:51 pm 
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Do you need a totally solid support base anyway? What's wrong with placing 'pads' at regular intervals? Corners and regular spacing along/across.
The floor joists of the shed will be at 400mm or 600mm intervals anyway and won't require support 'everywhere'..

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PostPosted: Wed Jul 11, 2018 7:47 pm 
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Some 6inch block laid as pads every metre will suffice. It’ll provide a bit airflow underneath too.

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PostPosted: Thu Jul 12, 2018 10:55 am 
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kellys_eye wrote:
Do you need a totally solid support base anyway? What's wrong with placing 'pads' at regular intervals? Corners and regular spacing along/across.
The floor joists of the shed will be at 400mm or 600mm intervals anyway and won't require support 'everywhere'..


The shed doesn't have a floor hence no joists. I need to make my own floor.


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