R
Russell
Well-known member
Why do some people use a lean concrete mix instead of type one for a sub base below pavers?
Shovelhands
Well-known member
I assume you mean block paving?
I prefer it, as once you’ve got the edges set on a bed of concrete/mortar, then there’s virtually nowhere for the sand to go. Unless the type one is perfect, then there’s a chance the sand can wash through or into it, resulting in the blocks sinking.
I see plenty laid round here on crushed hardcore, no surprise when it starts stinking.
Having done a job in resin bound aggregate recently, I shall not be bothered if I don’t lay another block or slab again
I prefer it, as once you’ve got the edges set on a bed of concrete/mortar, then there’s virtually nowhere for the sand to go. Unless the type one is perfect, then there’s a chance the sand can wash through or into it, resulting in the blocks sinking.
I see plenty laid round here on crushed hardcore, no surprise when it starts stinking.
Having done a job in resin bound aggregate recently, I shall not be bothered if I don’t lay another block or slab again
V8Druid
do it as well as you can,but learn to do it better
I assume you mean block paving?
I prefer it, as once you’ve got the edges set on a bed of concrete/mortar, then there’s virtually nowhere for the sand to go. Unless the type one is perfect, then there’s a chance the sand can wash through or into it, resulting in the blocks sinking.
I see plenty laid round here on crushed hardcore, no surprise when it starts stinking.
Having done a job in resin bound aggregate recently, I shall not be bothered if I don’t lay another block or slab again
...... this sort of thing James ??seen some locally, recently ..... I like it
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Stubota86
Well-known member
I assume you mean block paving?
I prefer it, as once you’ve got the edges set on a bed of concrete/mortar, then there’s virtually nowhere for the sand to go. Unless the type one is perfect, then there’s a chance the sand can wash through or into it, resulting in the blocks sinking.
I see plenty laid round here on crushed hardcore, no surprise when it starts stinking.
Having done a job in resin bound aggregate recently, I shall not be bothered if I don’t lay another block or slab again
What was the resin like to put down? I’ve a job coming up where they want resin but can’t decide whether to do the course myself and lay it or sub it out
What sub base did you have to lay it on?
Shovelhands
Well-known member
Yes much like that.
What was the resin like to put down? I’ve a job coming up where they want resin but can’t decide whether to do the course myself and lay it or sub it out
What sub base did you have to lay it on?
Resin was ok to lay, I’d recommend going on a course if you want to do it yourself. It’s not rocket science, but you do need to do it right, there are ways to cut corners and potentially f**k it up. I took the view that the product is too expensive to not make every effort to do it right.
I laid it on concrete, there are other sub bases suitable and possibly better? But I had more confidence in laying it on concrete, as it was the first time I’d laid it, that in itself had its complications which required a bit of outside the box thinking to best prevent future problems, but all came out well in the end
Stubota86
Well-known member
Yes much like that.
Resin was ok to lay, I’d recommend going on a course if you want to do it yourself. It’s not rocket science, but you do need to do it right, there are ways to cut corners and potentially f**k it up. I took the view that the product is too expensive to not make every effort to do it right.
I laid it on concrete, there are other sub bases suitable and possibly better? But I had more confidence in laying it on concrete, as it was the first time I’d laid it, that in itself had its complications which required a bit of outside the box thinking to best prevent future problems, but all came out well in the end
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Cheers mate, looks great!
I spoke to a few manufacturers and apparently tarmac or concrete is best
I actually had to strip an older resin bound floor up in an office reception that had been laid over ply and raised access tiles. Honestly one of the worst jobs I’ve ever had. Stuff had stuck so well we ended up replacing all the access tiles cos we just couldn’t get it off. All night work too just to really piss me off.
Shovelhands
Well-known member
Yes tarmac or concrete, but the company I used for the resin, do a grid system which potentially looks good, I just need to use it somewhere other than a customers job for the first time, just to be a bit more confident in using it, but it has a lot of installation benefits tbh.
Concrete was definitely the way for me on that particular job. Imo you can’t resin over any joints though, not long term anyway, so I made provisions for the concrete joints in the resin surface. In some ways this actually aided the installation process. But just things you’ve got to think about.
R
Russell
Well-known member
I did a course on the resin bound aggregate but didn't think much of it ( the course or resin). Like you say if you go over the joints in concrete it cracks with the heave of the ground. Also how do you clean the mixer out? I was told to be careful with what solvent I use as it could f**k up the next batch. Another thing I wasn't sure on is can it survive frost? There have been a lot done around here but most look rough a couple years later. Then you get stuff growing in it. With block pavers I thought type one is used as water is supposed to soak through that where as maybe not with concrete?
With concrete sub base how thick are people going for on a driveway? 100mm wouldn't save much digging. Is 50mm going to do anything?
With concrete sub base how thick are people going for on a driveway? 100mm wouldn't save much digging. Is 50mm going to do anything?
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Left hooker
Well-known member
Lean mix is quite porous if not heavily compacted and floated off
Shovelhands
Well-known member
As Left Hooker has said, a lean mix just compacted with a wacker is more the job I’m thinking, rather than actually laying a slab of concrete. A few inches over a well compacted crush or similar sub base is what I’d go for. Imo it just seals the sub base enough to stop the sand washing through.
As with anything, there are drawbacks and advantages. The resin is no different. You’ve got to believe in it and follow the manufacturers guidelines a much as possible, like I said previously, it’s easy to slap it down on the cheap for a wow factor, but long term that job may not last, which doesn’t do the perception of the product any good.
I will admit though, I didn’t go looking for the job, it was purely customer request. Saying that, I wouldn’t have done it unless I had some faith in it, I did the course, had good advice from the supplier and had confidence we could do a good job that would stand the test of time.
Clean up after the job can be a bastard tbh, because you’ve got a limited time to get the resin off your tools and the mixer, it’s a job where you need a few clued up hands on deck. A special solvent is available, from my supplier anyway (Vuba), which I used as instructed, to keep tools clean while working. Whilst it attacks the resin effectively, it evaporates quickly, so unless your literally pouring it on the resin itself, then there’s no harm done. We found using a gun wash worked well on basic clean up after the job, once everything is clean and dry then there’s no worry about compromising future mixes imo.
V8Druid
do it as well as you can,but learn to do it better
sounds like a bitch of a job ....... does look nice though .... local 'new' supermarket had all their footpaths done as it was being built and must say ... looks the bollox ... time will tell on it though and gets SOOOOOOOME use daily .... be interesting to see how it stands up ?
Furniss
Well-known member
We did some fair few years back a small area within a tarmac drive bordered by setts - we laid it on concrete, was a faff but it worked out fine and still looks good.
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