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Plastic shed base

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22 May 2025
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I’m going to build a 10x8ft wooden shed, I already have concrete slabs down and I’m thinking about buying a plastic grid base to put on the concrete slabs, and then build my shed on top. When it rains, if some rain runs into the plastic grid, will it soak into the concrete slabs? And if not, would it end up evaporating upwards onto the wooden shed base, which will be pressure treated tongue and grooves? Either way, is this base idea ok to use, that I’ll be using concrete slabs and then the plastic grid?
 
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It would be cheaper to use more slabs, (or even bricks) lay them so that they do not exceed the footprint of the shed, to reduce the chance of water landing on them and running under onto the timber. Space them out for underfloor ventilation.

You don't need to worry about the current slabs getting wet, and water should just drain away unless you have low areas that puddle.

Fit a gutter into a butt or soakaway to reduce the amount of water that ends up splashing up from the floor.
 
I’m going to build a 10x8ft wooden shed, I already have concrete slabs down and I’m thinking about buying a plastic grid base to put on the concrete slabs, and then build my shed on top. When it rains, if some rain runs into the plastic grid, will it soak into the concrete slabs? And if not, would it end up evaporating upwards onto the wooden shed base, which will be pressure treated tongue and grooves? Either way, is this base idea ok to use, that I’ll be using concrete slabs and then the plastic grid?
We recently shifted a shed and the base of the shed was standard 50mm wooden rails. However these were suspended off the ground via plastic runners.
 

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