Shed base joist question

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donin6
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Shed base joist question

Post by donin6 » Wed Jul 12, 2017 9:03 am

Hi, I have a question regarding building a base for a shed.
I'm planning to install an 8X7 resin shed. I've already tamped down and leveled an area about 9' by 8' (with the 3/4 gravel), and I'm about to build an 8X7 base for the shed.
All the instruction videos I've seen are using 2X6 joist, add on top of that 5/8 plywood and about 1.5" of the shed floor thickness, it's quite high off the ground.
So the question is: Can I get away with using 2X4 joist?
I only use it to store garden tools and patio furniture, nothing really heavy at all.
Thanks

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Shannon
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Re: Shed base joist question

Post by Shannon » Wed Jul 12, 2017 11:43 am

Absolutely , I would space them at 12" o.c to help with beefing it up abit just to be sure.
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donin6
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Re: Shed base joist question

Post by donin6 » Wed Jul 12, 2017 12:55 pm

Shannon wrote:Absolutely , I would space them at 12" o.c to help with beefing it up abit just to be sure.
Thanks Shannon.

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A. Spruce
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Re: Shed base joist question

Post by A. Spruce » Wed Jul 12, 2017 9:39 pm

You can simply put the poly shed directly on the gravel if you so choose.

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Shannon
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Re: Shed base joist question

Post by Shannon » Thu Jul 13, 2017 8:43 am

A. Spruce wrote:You can simply put the poly shed directly on the gravel if you so choose.
Yes I am kind and of surprised that if it has a 1-1/2" thick floor that you want it on a plywood base.
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A. Spruce
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Re: Shed base joist question

Post by A. Spruce » Thu Jul 13, 2017 11:10 am

That, and I don't like the idea of putting wood in direct contact with the ground like that, it can't breathe, so it will always be wet and will rot quickly. I'd give it 3 to 5 years tops, before it started letting go. Moisture will also be held between the poly floor and the plywood, again, causing rot.

And, no, using pressure treated materials won't make a difference in longevity. Today's PT is neither as protective as it once was, nor is it absorbed deep enough into the material to make much difference.

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Shannon
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Re: Shed base joist question

Post by Shannon » Thu Jul 13, 2017 12:39 pm

A. Spruce wrote:That, and I don't like the idea of putting wood in direct contact with the ground like that, it can't breathe, so it will always be wet and will rot quickly. I'd give it 3 to 5 years tops, before it started letting go. Moisture will also be held between the poly floor and the plywood, again, causing rot.

And, no, using pressure treated materials won't make a difference in longevity. Today's PT is neither as protective as it once was, nor is it absorbed deep enough into the material to make much difference.
That's why I like sheds placed up on a gravel base and skids...for better drainage and air movement
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