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I want to build a 4m x 5m raised platform for my kids fort. It will be 2m high. I have a few questions:

It is OK to attach the posts at the corners or will I need more in the middle?

What do I attach the frame to the posts with?

How far apart should I place the floor joists?

What do I attach the floor joists with?

With the floor boards do I need some space between them?

Thank you. I probably will have more questions.

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    You're basically building a free standing deck. You have to follow all the rules for framing a deck - sizing joists, beams, posts, etc. etc. However you don't have a nice sturdy house to attach to - with it freestanding, the risk of collapse is far greater. Be super careful - deck collapses kill or injure more people than any other construction error. – batsplatsterson Dec 4 '19 at 9:45
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grab a framing manual from your hardware supplier, it will tell you what size beams and posts are required to make a sturdy floor.

It is OK to attach the posts at the corners or will I need more in the middle?

4 posts sounds workable. but yo will probably need bracing to keep the posts straight. or else use very deep holes for the posts.

What do I attach the frame to the posts with?

Bolts of a weather resistant type eg: galvanized.

How far apart should I place the floor joists?

See framing manual.

What do I attach the floor joists with?

Nails or joist hangers. Depending whether you want to pass the joist over the frame or butt them up-to it.

With the floor boards do I need some space between them?

Does it rain where you live? Basically you are building a deck. The gaps allow rain to drain through the deck.

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    A 4m x 5m (13.12 ft x 16.4 ft) deck will need more than just 4 posts at the corners. + – JACK Dec 4 '19 at 13:13

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