3m x 1.51m wooden base for storage shed

[stewbiedoooo]

I’m purchasing a 3 x 1.51m shed 

I need to build a base for it but Im unable to have a permanent foundation 

have decided to build a wooden foundation 

I need to know what wood to buy that will hold up to the elements 

what thickness wooden to suit the size of shed

how far I should have the spacing to then add flooring

And any other suggestions or tips would be greatly appreciated 

thanking you in advance 

nick 

[Jewelleryrescue]

Hi @stewbiedoooo 

Basically your building a mini deck of set dimensions.  So to advance your planning look up deck projects and best how toos. For starters  use H4 treated pine for the ground timber  as a guide.  

Others will be able to reference you too deck building resources soon

[JacobZ]

Hi Nick (@stewbiedoooo),

A warm welcome to the Bunnings Workshop community and thank you for your question.

It should be noted that most shed manufacturers will not offer a warranty on a shed that is not installed on a concrete base. You can do it, but it is unlikely it will be covered by a warranty. 

As @Jewelleryrescue has already mentioned, you are essentially building a timber deck, so the principles of deck building apply.

You might like to check out the following articles for some guidance.

• How to build a low-level deck
   
• How To Build A Deck
   
• How to understand deck components
   
• How to understand deck span tables.

You can look at the Absco Sheds 1.52 x 0.78m Timber Flooring Kit as an example of what would be required.

If it is in direct contact with the ground, you should use H4-treated timber. If it is elevated, you can use H3-treated timber.

Your joists should be spaced 450mm apart to support your flooring, which should be H3-treated to resist weathering.

A frame made from treated pine sleepers seems like a good option.

Let me know what you think and if you have further questions, please don't hesitate to ask.

Jacob