Wideslab 100mm or 150mm hollowcore

Moggaman · 25-02-2021 01:48AM #1

Hi
I recently got a price for hollowcore from a precast manufacturer. They quoted me for 150mm hollowcore. I noticed since that they do a wideslab 100mm option. Just wondering why this wasnt given as an option or is there limitations with it. I am struggling for height and the extra 50mm may be worth it?
Thanks

DOCARCH · 25-02-2021 07:15AM

What does your engineer say/recommend?

Moggaman · 25-02-2021 09:41AM

DOCARCH wrote: »

What does your engineer say/recommend?

I have not discussed it with him yet.. I am researching prices and just wondered about the differences between the two products .
I presume the wideslab means less loading on the walls but possibly less ability to build dense block work on the first floor?.

DOCARCH · 25-02-2021 01:15PM

Too little information for anybody to comment and you are verging on a structural question (which is not permitted)!

You should discuss with your engineer.

Metric Tensor · 25-02-2021 03:15PM

You need to get an engineer to give appropriate loadings to the slab manufacturer and they will then happily provide you with a price for any of their products that can support the relevant loads.

If you are leaving it to the slab manufacturer to pull the loading values out of their own arse the quality and safety of the end result will depend on the quality of arse from which the figures are plucked!

Penn · 26-02-2021 02:47PM

Moggaman wrote: »

I have not discussed it with him yet.. I am researching prices and just wondered about the differences between the two products .
I presume the wideslab means less loading on the walls but possibly less ability to build dense block work on the first floor?.

The thicknesses are based on the proposed loading. You need to give the suppliers the loading for them to give the appropriate thickness, design and specification.

It's not a decision to make based on price. It's entirely dependent on the loading, which your engineer needs to provide to the supplier.

Moggaman · 26-02-2021 03:06PM

Penn wrote: »

The thicknesses are based on the proposed loading. You need to give the suppliers the loading for them to give the appropriate thickness, design and specification.

It's not a decision to make based on price. It's entirely dependent on the loading, which your engineer needs to provide to the supplier.

Thanks . That what I was wondering ... the wideslab is a bespoke slab in reality then

Calahonda52 · 26-02-2021 03:24PM

Moggaman wrote: »

Thanks . That what I was wondering ... the wide-slab is a bespoke slab in reality then

No, it is not, it is a solid slab as opposed to a hollow-core slab, it is generally wider: 2.4 versus 1.2 for HC.

As it is solid, it may actually be heavier than the HC, at 100 vs 150

Its a design issue with pros and cons which are stated on many sites
google PRE-STRESSED WIDESLAB FLOOR SLABS

As for being worried about 50mm at this stage, the mind boggles

Moggaman · 26-02-2021 09:55PM

Calahonda52 wrote: »

No, it is not, it is a solid slab as opposed to a hollow-core slab, it is generally wider: 2.4 versus 1.2 for HC.

As it is solid, it may actually be heavier than the HC, at 100 vs 150

Its a design issue with pros and cons which are stated on many sites
google PRE-STRESSED WIDESLAB FLOOR SLABS

As for being worried about 50mm at this stage, the mind boggles

Ah I’m not worried! I was never changing from HC.. I was just wondering about the different situations they might be used in.. and in fairness I’ve gotten a through answer . Thanks

Wideslab 100mm or 150mm hollowcore

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