Padstone

kinhell · 25 Dec 2007

I need to make a padstone under an rsj.
What is the best mix of concrete and any how long should it be left to set before removing the acrows?

Bowness72 · 26 Dec 2007

A common way is to get a precast concrete lintel and cut it to the appropriate length, which means you dont need to wait and the concrete strength is more than adequate.

seasickstevie · 26 Dec 2007

Bowness, are you saying that a concrete lintel does not need padstones? And if that's the case, is 150mm sufficient without the padstone?

Bowness72 · 26 Dec 2007

No, sorry if my last comment was a bit misleading. The cut down precast concrete lintel would be the padstone, and the length should be just as if it were a cast in-situ concrete padstone, sized to suit the relevant loads and masonry strengths being used, usually specified by the same person that specified the beam size - i.e. structural engineer ?

Robert too · 26 Dec 2007

Chopping in a concrete block also makes for a good padstone

Bowness72 · 27 Dec 2007

That could work if the beam is lightly loaded but if you use a concrete block, you need to make sure the block is quite a high strength block (and be stronger than the masonry below it - which it is unlikely to be if the wall is brickwork ?) otherwise it will crush under the concentrated load from the beam and not really be much use. Engineering bricks can also be used as a padstone.

kinhell · 27 Dec 2007

I created the padstone with a 1:3:6 mix of cement:sand:20mm gravel,

One side was a good mix but the other side a bit sloppy and ended up tamping it down to make sure with a batton. Not sure what happens if its too sloppy. Anyone have any ideas?

The two 8'' x 4'' x 13ft support a non weight bearing gable end.

How long do people leave the concrete to set before removing acrows ?

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Padstone

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