eccsmk
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| posted on 22/7/09 at 10:06 AM |
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concrete
i need to lay a new floor in my garage but i dont know how to work out how much sand and cement i need
the garage is 17feet long by 7 feet wide and really only needs to be 3" deep as is going on an existing base
can anyone help please
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alistairolsen
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| posted on 22/7/09 at 10:11 AM |
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17*7*0.25 = 29.75 cubic feet which is 0.84 cubic metres.
seems very little to me?
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DarrenW
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| posted on 22/7/09 at 10:13 AM |
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Roughly;
17ft is about 5.5m.
7ft is about 2.5m
3" is about 0.075m
5.5 x 2.5 x 0.075 = roughly 1 cubic metre.
3" isnt a lot though. Depending on how the base is prepped (and for a garage probs not the same as a house) it may be subject to a little
movement and could crack, unless you are putting a sheet of rebar under the floor.
Sorry - missed the bit about existing floor.
[Edited on 22/7/09 by DarrenW]
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eccsmk
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| posted on 22/7/09 at 10:13 AM |
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its not a huge amount but
i need to go and buy bags of cement and ton bags of sand
i just need to know how many of each to get delivered
im not very good at this sort of thing
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Mr Whippy
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| posted on 22/7/09 at 10:14 AM |
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concrete mix (not plain sand) tends to come in 1 ton bags anyway. All you add is the cement powder and water.
[Edited on 22/7/09 by Mr Whippy]
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DarrenW
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| posted on 22/7/09 at 10:14 AM |
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Builders merchants will advise qty's of each no probs. I cant remember the preferred mix for a floor.
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DarrenW
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| posted on 22/7/09 at 10:16 AM |
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quote:
Originally posted by Mr Whippy
concrete mix (not plane sand) tends to come in 1 ton bags anyway. All you add is the cement powder and water.
[Edited on 22/7/09 by Mr Whippy]
Good point well made. Cheaper to buy dumpy bags too (and if you have an account probs free delivery). Id be tempted to get a few bags of cement and
start mixing / pouring. You can always buy more bags if needed.
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eccsmk
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| posted on 22/7/09 at 10:17 AM |
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it is going on top of a concrete base (is on the site of an old outbuilding) but the base is below the level of my drive which we made deeper last
year
i will add a membrane over the existsing site
and add some wire mesh (about 3mm thick)to the concrete to limit movement (we have used this before on the drive way and it hasnt cracked yet(fingers
crossed  )
quote:
Originally posted by DarrenW
Roughly;
17ft is about 5.5m.
7ft is about 2.5m
3" is about 0.075m
5.5 x 2.5 x 0.075 = roughly 1 cubic metre.
3" isnt a lot though. Depending on how the base is prepped (and for a garage probs not the same as a house) it may be subject to a little
movement and could crack, unless you are putting a sheet of rebar under the floor.
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eccsmk
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| posted on 22/7/09 at 10:30 AM |
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thank you folks
im now going to get it all ordered
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nick205
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| posted on 22/7/09 at 10:31 AM |
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To give you a rough idea I laid a shed base last summer of 8' x 6'. I dug out 3 inches and filled with hardcore then laid concrete in a
4" deep frame over the top. No DP membrane or wire mesh as it's a simple garden shed base.
I used exactly 1 tonne bag of hardcore and 1 tonne bag of ballast. IIRC I got through 6-7 bags of cement powder too.
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eccsmk
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| posted on 22/7/09 at 10:45 AM |
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thanks nick205
ill get over to the merchants and get it ordered
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designer
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| posted on 22/7/09 at 11:14 AM |
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If you have an old floor already down.
http://www.pureadhesion.co.uk/category/38/self-levelling-compound
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Blackcab
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| posted on 22/7/09 at 11:17 AM |
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You would be better off getting a mini mixer concrete truck to deliver it .. the cost difference is not that much and the quality will be loads better
and loads quicker to do
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smart51
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| posted on 22/7/09 at 11:25 AM |
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Blatant thread hijack
I've been thinking of concreting the lane that leads to the garage at the back of my house, well my bit of the lane anyway. How deep would I
have to make it and what is the typical cost of ready mixed concrete per cubic metre?
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mookaloid
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| posted on 22/7/09 at 12:46 PM |
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if you are going to mix your own a good mix for a garage floor would be 4:2:1 i.e. 4 parts gravel, 2 parts sharp sand and 1 part cement ( by volume)
Cheers
Mooky (City and Guilds in Concrete Technology)
"That thing you're thinking - it wont be that."
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DarrenW
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| posted on 22/7/09 at 12:53 PM |
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quote:
Originally posted by smart51
I've been thinking of concreting the lane that leads to the garage at the back of my house, well my bit of the lane anyway. How deep would I
have to make it and what is the typical cost of ready mixed concrete per cubic metre?
What you can get away with might depend on what the substrate is and what traffic goes up the lane. If your neighbour decides to do the same and gets
a 20T cement mixer in then they may smash yours up. If you are only ever on it with your se7en then you might be able to get away with less.
Depending on area you sometimes have to put expansion joints in too. Sounds like you might het away with a standard domestic type driveway. 2 foot of
hardcore and 18 inches of high quality concrete may do the trick. All dug and mixed by hand of course
Ref OP - ready mix would be worth a quote. Some places mix on the spot so you pay for what you use. Some get you to order what you need and drop it
off - if too much you have to think quick. Some mix only and you barrow it into place (they are quite quick so if you arent fit prepare to be
exhausted) Some places might even do a cash job on a sat morning before they go to their main job.
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richardR1
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| posted on 22/7/09 at 01:54 PM |
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Just get cube of readymix, far easier and prob as cheap. Better quality too.
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Nick Skidmore
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| posted on 22/7/09 at 02:13 PM |
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Having had a 8m x 3m x 15cm base put down this year I was advised not to mix myself as price would be higher and a lot more work.
A cube will be about 70 to 90 quid. Get a slag mix not a cement mix to give you working time.
I had mine power floated after and it is very smooth. The spirit level bubble does not go beyond the lines at any point.
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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nick205
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| posted on 22/7/09 at 02:19 PM |
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quote:
Originally posted by Nick Skidmore
I had mine power floated after and it is very smooth. The spirit level bubble does not go beyond the lines at any point.
Great for flat floor set-up of the car then 
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Peteff
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| posted on 22/7/09 at 02:22 PM |
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You buy ballast in ton bags.
A metre is a lot to mix by hand, even with a mixer just throwing it in is a lot of work. I had to do it that way on the back as it is inaccessible
and tipping the ready mix and barrowing it is a pain as well. I reckon a metre is about 2.5 tonnes so work your quantities out accordingly.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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eccsmk
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| posted on 22/7/09 at 03:56 PM |
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i managed to price my materials today but didnt manage to get across to order it (needed to work out complete cost before i ordered
anyway
ballast is £14 per ton
cement £3 per bag (25kg i think)
and the mixing can be done for free (arent brothers useful to have )
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