Padstone size - confused

6 Aug 2019
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United Kingdom
I have the spec of my padstones from my SE - but he has gone AWOL and I am unable to clarify with him what exactly he means.

This is a single RSJ, with top plate, that will be supporting an old, standard brick cavity wall (approx. 300mm wide).

The structural calcs refer to "Padstone 1 & 2" - which I assume means there is one single stone at each end.

He has simply written - "USE MIN 300 LONG x (275)(200ACT) x 215 HIGH MASS CONC"

What on earth does that mean? I cannot see any padstones for sale that meet that size.

Is he suggesting the 300mm long dimension would sit across the cavity, or two separate stones at each end, one sat on each leaf of the cavity wall? What does 275 200act mean???

Thanks in advance.
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No idea what that means.

Are you supposed to cast these things on the ground and lift them into position? Or is he expecting you to cast them insitu? in which case you could ask him how to stop the concrete going down the cavity; and how you are to achieve the required crushing strength.

Lazy specifying IMO.
Is it a 275 cavity? If so it means the total width is 275mm, but the actual bearing 200mm (100mm each leaf)
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Would the simplest solution be to get the next size up padstone (300x300x215) and cut to the width of the wall as required?

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