Different types Padstones?

Nitell · 5 Jul 2021

Hello guys

My surveyor says to get RC35 Padstones.

I asked Builders Merchants if they can supply RC35.

Answer they gave?. 'Presumably', they do. Not helpful. If they sell the stuff and can't be specific, how can I know what to get?.

Are there different standards for Padstones?.

Please advise.

Thank you.

tony1851 · 5 Jul 2021

The number 35 refers to the crushing strength of the concrete (in Newtons per sq. mm). Most padstones are actually RC50 so RC35 is a bit on the low side.

Nitell · 6 Jul 2021

Thank you.

What size padstone for 215 mm wall, please?.

tony1851 · 6 Jul 2021

Nitell said:
Thank you.

What size padstone for 215 mm wall, please?.

Sorry, no idea.
It depends on the load the beam is putting onto the padstone, and also the bearing capacity of your brickwork. Your SE should advise on the size of padstone; if he hasn't told you the size required, he's not done his job.

^woody^ · 7 Jul 2021

Did your "surveyor" mean something like this? Ask at Jewsons if any in stock

Nitell · 7 Jul 2021

Thank you.

I guess someone will know more about this attachment than I do.

Please have a look.

bsr · 7 Jul 2021

Do you not have any section drawings? I would look on these for padstone size.

Paulg31 · 8 Jul 2021

Its about time your Structural Engineer learnt to use up to date design codes. BS449 was replaced by BS 5950 and then years later by BS EN 1993.

The masonry design code is also out of date but still used by some older engineers.

tony1851 · 8 Jul 2021

Yes, 449 and 5950 are superceded, but I've still seen a few figures done under 449. It's still accepted by many LABC checking engineers for smaller domestic work; the advantage is that its quicker but it is also conservative, and smaller sections can be obtained by using the later Codes.
I stick with 5950 and have never had any queries raised. EC 3 potentially gives even lighter sections, but I rarely use that, not being into pain.

Nitell · 9 Jul 2021

I never hired a such surveyors before for this type of work but I began to feel he could be more involved, and what you have quoted here confirms my thinking. I am fed up with him that is why I put my queries here.

As far as section drawings are concerned, the best info I have found for Padtones is what I have attached here. I will consider the Codes you have given me.

Thank you.

^woody^ · 9 Jul 2021

That bloke has specified a concrete lintel as an alternative. Use those and you don't need padstones.

Alternatively, as the steel beam is so small, use 2 solid blue bricks instead of a padstones.

jeds · 9 Jul 2021

For a 2500 span you could probably set it on two of my mum's jam tarts and it would be ok.

tony1851 · 9 Jul 2021

So what's the characteristic compressive strength of your Mum's jam tarts (in N/mm²)?

bsr · 11 Jul 2021

I have a 3.2m span, single storey, on a 100x150x250mm padstone which is barely more than a brick. As above I think anything will do really.

jeds · 12 Jul 2021

tony1851 said:
So what's the characteristic compressive strength of your Mum's jam tarts (in N/mm²)?

Not sure. I just know they would be classed as dangerous weapons if you were caught with one outdoors.

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Different types Padstones?

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