Hi my question has 2 parts about piles and creating a subfloor.

I want to install a 4.8x4.8m (~16'x16') summerhouse; its existing floor is 24mm (~1") floor boards on 75x50mm (~"2x3") floor posts.

I don’t want a concrete base so I thought I could create my own piles using 110mm (~4.5") pipe (filled with postcrete and topped with damp-proof membrane) for the sub floor to rest on.

Is 110mm (~4.5") good enough or should I get 150mm (~6")? How deep should I go with the piles and at what spacing.

I then want to create a base frame for the summerhouse to go on and was thinking that as it already comes with a 75x50mm (~"2x3") floor I could create another one (joist running the opposite way) with 75x50mm (~"2x3") timbers.

Are these good enough timbers for the sub floor as I don’t want to go too high either? what spacing should I have between them?

  • Can you define 'pile'? I think that term might mean something slightly different from region to region. – DA01 Sep 25 '13 at 15:16
  • It really depends what kind of soil this is going in. Where are you at and has the soil been undisturbed? – DMoore Sep 25 '13 at 17:04
  • @DA01 "Pile" is an accurate term, but you might think of it as a foundation "pier". In essence, columns that extend underground to create foundation points. Most often used for underpinning/foundations of decks and sheds, or in addition to standard foundations either where support columns will be located above or where unstable grade would pose a problem, in residential construction. – Jacob S Sep 25 '13 at 17:09
  • I'm not sure I get what you're asking. Do you have an already constructed house that you want to move to a new location? – Chris Cudmore Sep 25 '13 at 17:21
  • @JacobS that makes sense. I've always heard the term "piling" but now that I think about that, that's just the plural of pile. ;) – DA01 Sep 25 '13 at 17:35

Try this guide. step-by-step and easy to follow! http://www.gardenbuildingsdirect.co.uk/blog/build-a-shed-base/

  • 1
    Link only answers are discouraged here. Providing a summarized overview with a reference link is a much better option to minimize lost content due to dead links. – Doresoom Aug 18 '14 at 13:47

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