Although frowned on by some 'official' shed build sites, my last shed lasted for 30 years (and it was only a cheap and cheerful off-the-shelf shed) on a level gravel base.
I'm doing the same for this shed. 4x2 framework on level ground, filled to a depth of about 2" 50mm with 20mm gravel. 4x2 framework is probably overkill, but not easy to get pressure treated 4x1 carcassing.
This is easy to level, almost self-leveling after the floor is laid, as the gravel will move to the lower spots if there are any, and is well draining so no chance of damp rising up to the floor structure.
After killing off all the weeds and levelling the site, I marked out the shed size, and made the frame for the base 50mm bigger all round, so any rainwater off the walls falls onto the gravel, and drains away.
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| Cleared, levelled, and pegged out to shed dimensions. |
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| Frame prepared 50mm outside shed footprint. |
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| Gravel going in. Last frame timber left out to allow access for wheelbarrow. |
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| Nearly done. |
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