Concrete base shed extension

Discussion in 'Getting Started FAQ' started by Seth Finegold, Apr 26, 2020.

  1. Seth Finegold

    Seth Finegold New Member

    extending my small brick shed at the bottom of my garden by building a sort of hybrid timber/brick structure. We want to build the extension out of timber and keep the remaining shed structure for the most part. The original single skin brick building is built on a concrete slab so the plan is to demolish the front wall, extend the slab by 1m and build a new timber framework front . My question is regarding the concrete base. What mix should I use? I already have a load of perfectly sized gravel in my garden which I want to utilise to save buying new aggregate and lugging it through the house. What mix of sand, gravel and cement should I use for the base? I have seen 1:2:4 suggested online. It will be 100mm deep with 150mm toes and I will use reinforcement mesh to strengthen. Any tips of how to join to the existing slab and the mix ratio of sand and gravel to make ballast would be helpful.

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