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  • Changing topic, has anyone got experience with installing groundscrews themselves? After seeing @lowbrows garden room being built on them, I fancy those over concrete as if I do it myself, it's about half the cost and I would have thought more environmentally responsible. Also, better airflow etc to help with the wooden workshop/shed going on top not rotting from the ground up.

    It doesn't look too hard. Pilot drill with 25mm SDS+ (I'm guessing this is more to check if there's anything too solid in the way - I can source a 1000mm long bit easily enough), then screw in either with a manual tool or one of those big electric braced drill type jobbies (I would start with the former and rent the latter if I find they're not going in). I'm also guessing it might be better to do it over winter when the ground is softer than in summer, or is that a bad idea? Then just stop screwing when level.

    Unsure how big to go. As usual, I'm thinking of maybe over engineering it and getting the 1200mm screws. Unless anyone thinks I should go bigger.

  • I used cardboard tube concrete forms, with high strength concrete and 10mm rebar reinforcement.

    Levelling was done with plastic support pads, each of which can take >500kg

    Given the amount of pre-existing rubble that I uncovered, groundscrews could well have taken just as much digging.

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