DIY breeze blocks

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sda
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DIY breeze blocks

Post: #284149 sda
Sun Mar 29, 2015 12:11 pm

I'd like to make some hollow concrete breeze blocks, the ones with the two square holes in. Is there an easy way to produce a mould that doesn't require cutting wood, etc? They won't be for building work.

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Re: DIY breeze blocks

Post: #284162 Skippy
Sun Mar 29, 2015 9:42 pm

Not really , a wooden mould or shutter is probably the best choice and can be used over and over again.
That said you could take four blocks that you wish to copy and place them so they enclose a space the same size as a block , that'll mean the edge corners are just touching. Then line with thin plastic to stop the concrete sticking and use something like recycled polystyrene packaging to form the "holes" in the blocks and fill in the rest with concrete.

Problem of course is that you would be using plastic and polystyrene on a pretty much single use basis whereas a wooden shutter will be far more fitting for a green building forum :(

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diggernotdreamer
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Re: DIY breeze blocks

Post: #284164 diggernotdreamer
Sun Mar 29, 2015 9:57 pm

don't they cost like 50p each to buy, probably cheaper and easier to buy them ready made

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Re: DIY breeze blocks

Post: #284181 Skippy
Mon Mar 30, 2015 6:23 pm

I think they are a bit dearer than that but as you say not hugely expensive , and even cheaper if you ask on free cycle .

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Re: DIY breeze blocks

Post: #284197 dave45
Wed Apr 01, 2015 10:39 pm

£2.97 here http://www.buildingmaterials.co.uk/concrete-blocks.html

I built two garden walls with them, and can inform you that they are not precision-manufactured.... i.e. its a challenge to lay them accurately if you assume they are

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Re: DIY breeze blocks

Post: #284199 Skippy
Thu Apr 02, 2015 8:41 pm

Didn't think they were that expensive . I was thinking the regular 4" blocks were about a quid each. To be honest I have a large pile of blocks that haven't cost me anything as I generally keep an eye on builders skips ( clue in my username ) where it's common to find a few at a time left over , new and just dumped. Sometimes they are used but clean up really easy. Granted though the hollow blocks are rarer to find.
We never asked sad what the blocks were to be used for , perhaps there are alternatives.

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Re: DIY breeze blocks

Post: #284200 Odsox
Fri Apr 03, 2015 7:53 am


...and I thought things were expensive here !

Standard 4" concrete blocks here are about 50p and 8" hollow blocks about £1.00.
I've got through lots of blocks since moving here, oh and that price is delivery as well.
It's notoriously difficult to find Irish prices online, but I found this one ..... https://www.build4less.ie/bricksblocks-c-8_10.html
Tony

Disclaimer: I almost certainly haven't a clue what I'm talking about.

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Re: DIY breeze blocks

Post: #284201 diggernotdreamer
Fri Apr 03, 2015 7:34 pm

WHAT!!!!!! you found an Irish price online, I don't believe it. We went to Quinns and bought the double cavity blocks and they cost us 75 cent each, I think we are lucky here as building materials are very cheap, unlike everything else which is expensive

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doofaloofa
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Re: DIY breeze blocks

Post: #284202 doofaloofa
Sat Apr 04, 2015 8:35 pm

@ sda

What are you using the blocks for?
ina wrote: die dümmsten Bauern haben die dicksten Kartoffeln

sda
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Re: DIY breeze blocks

Post: #284214 sda
Sun Apr 05, 2015 7:24 pm

I want to make an enclosure as a slightly raised bed and use the holes to pot flowers in. I thought I might use a large plastic tub of some sort and put a couple of boxes or jars in to make the holes, put the concrete in and tip the form out and leave it to dry. A 20kg bag of concrete mix is only six or seven pounds.

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Re: DIY breeze blocks

Post: #284215 doofaloofa
Sun Apr 05, 2015 7:42 pm

How many blocks can you buy for £7?

Hate to be a dick, but precast concrete products are very often better value for money than poured

Economy of scale or something
ina wrote: die dümmsten Bauern haben die dicksten Kartoffeln

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Re: DIY breeze blocks

Post: #284216 Skippy
Sun Apr 05, 2015 7:47 pm

Next question would I suppose be how many blocks you need. A tonne sack of sand and gravel will lower the costs per block and a reusable mould would be the way to go , however , that would then need to be equated with the time spent if that time could be used more productively.

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Re: DIY breeze blocks

Post: #284218 doofaloofa
Sun Apr 05, 2015 9:47 pm

@6:1 (aggregate:cement) you will get approx 0.1m3 per sack, that's about 11 standard 9" blocks

That will be about 36 shovels of aggregate, or 2 barrow loads
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