Concrete Base for Summerhouse

Discussion in 'Builders' Talk' started by Niran Kaila, Jun 1, 2020.

  1. Niran Kaila

    Niran Kaila New Member


    I have a few questions regarding a concrete base we are about to have done for a summerhouse and seating area if anyone can help it would be greatly appreciated

    The area for the pad is 8.4m x 6.3m, this area was initially higher than the rest of the garden and we have taken off the excess soil so it now sits level with the rest of the garden.

    1) when having the concrete done, instead of removing the timber formwork can we keep this in place forever, as we will paint this to create a wooden trim effect with paving going on top, will this cause problems in the future (if the wood soaks up water will this affect the concrete in the long run?)

    2) instead of excavating further down, are we able to put the layer of compressed hardcore above this level ground (50mm compressed) assuming we will keep the formwork in place

    3) as it is sitting above firm ground already, will 50mm compressed TYPE1 MOT, 150mm ready mix concrete with A193 metal reinforcement be strong enough for the timber summerhouse and seating area (moderately heavy use)

    Thank you
  2. Abrickie

    Abrickie Screwfix Select

    1. Will not affect the concrete
    2. If the timber rots ?
    3. Yes
  3. stevie22

    stevie22 Screwfix Select

    You really want to get rid of topsoil as that tends to move under load.

    If you are going to go fully above ground then you could just leave the type 1 back from the edge so that the concrete is a bit deeper but there is no exposed loose material.
  4. Niran Kaila

    Niran Kaila New Member

    Cheers for the reply @Abrickie, timber will be pressure treated and will also give it a once over with anti rot
  5. Niran Kaila

    Niran Kaila New Member

    Cheers @stevie22, we got rid of around 3/4 inches of top soil which has now made it level with the ground level, or do we need to get rid of more top soil?
  6. stevie22

    stevie22 Screwfix Select

    OP you've probably got rid of any organic matter at 4" so should be ok. Just scoop out any soft spots as you go.
  7. Niran Kaila

    Niran Kaila New Member

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