O/T shed base

[Worthing exile]

Hi to the builders out there.

Doing a 12x8 shed base at weekend. Will a big bag of ballast be enough? how many bags of cement and would say a 4 to 1 mix do it?

 

[sebtucknott]

You're going to need about a six inch base.

Roughly that would be 24 x 40kg bags of ballast and 10 x 25kg cement.

Mix at a 5:1:1 ratio.

 

[Worthing exile]

how big is a big bag?

 

[Worthing exile]

sorry i should have said 12x10 to take a 10x8 shed

 

[beorhthelm]

you'll need a shed load of concreate. using one of the gravel calculators it reckons 2 big bags for 3inch depth. so you'll need a half ton or 15 bags of cement. and a mixer. should put down some lose sub-base too, a bag worth of that? (bag is about 800-900kg depending whats in it i think)

i looked at doing a base half the size and been throughly put off concreate and looking at the plastic mesh bases instead.

 

[Garage_Doors]

how big is a big bag?

A jumbo bag normally equates to roughly 40 small bags.

 

[Worthing exile]

ok thanks

 

[Merdalfthewizard]

3m x 2.4m x 0.75m concrete base will require 1 x jumbo (or maxi, depending on supplier) bag ballast and approx 10 bags o/p cement. If mixing yourself using mini belle mixer, 1/2 bag of cement to full drum of ballast (about 12 shovels of ballast) Which is about 1 full barrow load.
Depth of base is generally dependant on your sub base and soil. Alternately, put down sharp sand/cement base and lay 600 x 600 slabs on them, less messy and quicker.

 

[oxymoron]

quick rule of concreting multiply width and length eg. 4mtrs x 3mtrs =12. move the decimal point forward one place for 100mm thickness ie.1.2 cubic mtrs that means 2 bulk bags at .6 cubic mtr if you want to lay at 150 just add 50% to the bulk bag quantity and use mix as detailed above if using belle mixer, if you have not mixed this amount of material before get a builder mate to help, builders do it all the time and make it look easy, but it can be back breaking, enjoy

 

[Easy 10]

What a load of old nonce.

I've got an 8x6 at the back of my garden. Dug out and flattened the ground nice and level, bought a load of paving slabs and some sand, laid it all out nice and flat, put some underlay down under the slabs. The shed was build on top of that base about 5 years ago, and is still tip top. Bollocks to concreting.

 

[knocky1]

What a load of old nonce.

I've got an 8x6 at the back of my garden. Dug out and flattened the ground nice and level, bought a load of paving slabs and some sand, laid it all out nice and flat, put some underlay down under the slabs. The shed was build on top of that base about 5 years ago, and is still tip top. Bollocks to concreting.

Same here without the sheeting. Reinforced the floor of the shed with some extra struts.

 

[Mr Bridger]

It's all about the base, no rubble.