Shed base

fender · 26 Aug 2008

Hi Guys,

I wonder if you can help.
A client is about to purchase a 12ft x 10ft metal shed and they want me to make the concrete base.

1. how deep should it be
2. i assume i need to lay it on a dpm
3. what mix of sand/cement/hardcore should i use
4. how do i calculate the amounts required in question 3

Many thanks for your time.

Garry

WEIRDFISH · 28 Aug 2008

I am also laying a shed base of similar dimensions at the moment, 12x12, I have been reliably informed no dpm is needed but the base should of course be above ground level, a mix of about 6 bags of cement -1ton of ballast seems to be the norm, as to overall quantity, I too would like to know?
Regards
Jim

noseall · 28 Aug 2008

fender said:
Hi Guys,

1. how deep should it be
2. i assume i need to lay it on a dpm
3. what mix of sand/cement/hardcore should i use
4. how do i calculate the amounts required in question 3

Garry

1. 100mm is normal.

2. i personally don't bother with dpm. besides, a metal shed will have its own moisture producing qualities.

3. 6 ballast to 1 cement, and water of course.

4. at 100mm thick you will require 1.15 m3 of concrete or 2.25 tonnes of
ballast plus 15 bags of dust.

marshman · 28 Aug 2008

noseall";p="987841 said:
a metal shed will have its own moisture producing qualities.

now I,ve spat coffee over my key board.

Thermo · 28 Aug 2008

i think he is refering to the fact that the thing will be dripping with condensation, so the damp from the floor is the least of your worries.

noseall · 28 Aug 2008

Thermo said:
i think he is refering to the fact that the thing will be dripping with condensation, so the damp from the floor is the least of your worries.

aye big T, nail on t' head.

marshman · 29 Aug 2008

Thermo said:
i think he is refering to the fact that the thing will be dripping with condensation, so the damp from the floor is the least of your worries.

I'd got that, that's what made me laugh, Its the best description I've seen to describe a common problem with them.

fender · 30 Aug 2008

Many thanks for the info guys....

diynot

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Shed base

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