Slabbing on top of suspended concrete lintels

[chequers]

Hi
Last part of the garden can really only be done with decking on a slope which at its highest point is about 1.2m
the width is about 2.5m x 10 m length
I was looking at purchasing 2.5m concrete 100mm x 65 mm lintels and laying them on a larger concrete lintel back to a concrete footing on the ground
It would then allow me to slab on the top which i would so prefer as it would be in keeping and not have the maintenance of the timber
2.5 m span x 4 for every 450mm slab would provide 2x 50mm edge ,two x 100m thus only 150mm would be unsupported
Any thoughts

[lutonlagerlout]

I would say No
those pre stressed lintels are designed to have a load on them to work right
if you want to do something like this a block and beam construction would be better
or use the R15 lintels which are 150 by 100
cheers LLL

[chequers]

Thanks for the reply
yes i think probaly block and beam 2.5m lengths with 450mm infill blocks should replicate the decking and then take the slabs on top.

[lutonlagerlout]

sounds like structural plan mate
those 65mm lintels are note designed for this
LLL

[sy76uk]

I'd worry a little about the camber in the beams. Might cause the odd slab to rock.

[lutonlagerlout]

you would still have to lay on a bound bed though si?
LLL

[sy76uk]

Dunno Tony. I think a 50mm slab would sit alright in between the beams, it's just the camber and trying to get them to sit without rocking?
The hollow sound would do me. I had to lay flags on pedastalls once. Didn't fell or sound right.

[Tony McC]

Speaking of pedestals, has anyone else used them? I'm trying to determine a reasonable laying rate using them with, say 450x600mm flags.

I think it would be a little slower than 'normal' laying but the Italians who are trying to convince me otherwise reckon it's twice as fast.

I'm thinking that, if we reckon on 35m² of flags laid in a day on a mortar bed by a 1+1 gang, then I could expect 30-32m² on pedestals, mainly due to 'effing-about time' adjusting the screws to get the correct levels.

Any thoughts?

[PavingSuperstore]

Our landscaping guys have used pedestals before - can ask them, but re the original post, I can provide some photos of work in progress using beam and block if this helps at all.

[ilovesettsonmondays]

I have used pedestals on a few roof terraces over the years.First time was pedestals on top of like a kingspan type base .it was awfull that was on barings bank .slow and headtesting.The next time i did it we cleaned up money wise .a black click together plastic membrane was laid and then saxon 450s just clicked into the pedestals no screwing up or down. We got a pound a slab and all cuts were done by portuguese stone masons on daywork .we were laying 50 an hour my mate and me on a massive roof garden on a multi storey carpark.The third time was in old street london on a garden terrace for flats .These were screwable pedestals .the roof was out .the slabs were granite and were not all the same thickness 3mm to 7mm out etc .had to put mm spacers on the stools or chip bottoms off slabs .it was hard going as well.it probably took a week to do seventy m2 .main factors check roof check pedestals check slabs

[lutonlagerlout]

I reckon 35m2 per day for a 2 man team day in day out is ambitious
I aim to lay 20-25M2 with a 3 man team on a mortar bed,had really good days,but 1 off day can ruin the week
LLL

[ilovesettsonmondays]

I agree 20m2of Indian random 2 men a good days work

[sy76uk]

I only used pedastalls the once. The screw ones all in bus shelters. The went down really quick if I remember correctly but it was about 15 years ago.

I aim for 20m2 a day random with with 1 labourer.

[Tony McC]

I’m slightly surprised by those laying figures. Back when I was contracting, we based our rates on being able to lay a minimum 120m² per 1+1 gang per week.
We reckoned on 4 days @ 30m² and a fifth day to cover for bad weather, material delivery delays, cutting, jointing and general effing about.
I can appreciate that 30-35m² per day of patio or driveway work might not be achievable every day, due to the nature of the site, but 20-25m² per day? That does surprise me.

There’s no way I could do it now, but before I was injured, myself and one good labourer working on large highway or commercial projects would regularly lay 80-100 @ 3x2s (45-55m² ) per day, every day. Maybe that’s why I’m knackered now!

[r896neo]

I work on my own mainly and routinely lay 20-25m on my own of random sandstone in a day. This is using readymixed mortar so i just have to barrow it in.

Not including Bond bridges or anything either.

I just laid 55m of coursed width in 2 very manageable days 8 - 4

I get mortar delivered into tubs and the minimum is 1 cube which usually lays about 20m so i sort of have no choice as the tubs need emptied to be filled the next day.