Leveling a shed ("flat wedges"?)

andre_xs

Since I'm not a native English speaker, I may just miss the right word for this:
I would like to put a shed on a slightly uneven (paved) ground. I would like to raise it so that there's a good airflow and no wet underneath to prevent rotting, e.g. by putting bricks (we still have many lying around here) under the corners and (quite a few) other points were the shed can rest on. However, to balance out the slightly uneven paving, I'm looking for something I can use to top up the height of the bricks.
Basically something like a wedge but (a) heavy duty, because it needs to carry quite a bit of weight and (b) just flat, not in a wedge-like shape. More like thin sheets of a hard material, each one max 3mm or so thick. Size roughly 5 x 5 cm (2x2 inch)
Does something like this exist (officially for that purpose) or does anyone have an idea what I could 'mis-use' for that purpose?
Shouldn't be too expensive either...
Edit: It just came to my mind, maybe these flat metal plates with screwholes for joining wooden beams / rafters. I could even screw them to the floor of the shed to avoid that they slip out over time...

nofoollikeold

You could try roofing slates, but I think they are a little thicker than 3 mm.  
Might be easier to make up "pads" of mortar laid on existing paving, and spread out to achieve the correct level at each point.

andre_xs

Or maybe even the other way round? Brick, airgap, floor of shed. Then casing/boxing the airgap and filling it up with cement/mortar.

Apodemus

I’d go with slates, they will double as a damp-proof course between the bricks and the (presumably wooden) beams of the shed floor.

ElephantBoy57

I just used a combination of different sized bricks and tiles. But really maybe the best solution would be brick and cement, in other words, build your shed on a brick home made wall.

flashg67

 I've used this type of thing in the past - eg. https://www.ebay.co.uk/itm/BLACK-PLASTIC-INTERLOCKING-WEDGES-Levelling-Floor-Joist-Batten-K1-95x45x15/162407769340?hash=item25d041e4fc:g:xB8AAOSwTUZdJe3x