Padstone query.

[Bouba]

When putting in padstone on a internal wall for rsj, are normal clay bricks good under padstone.( piers on each side of opening)

What is the compressive strength of LBC bricks. Would it be beneficial to put a few concrete bricks under padstone.

Thank you.

 

[^woody^]

Use what ever the wall is made of

 

[Bouba]

Sorry woody. Are you saying if I am leaving piers on both sides, just put padstone on bricks which are already there. The wall is made of LBC brick which is marked LBC PHORPRES. Will these have enough compressive strength to support padstone and Rsj.

 

[^woody^]

The padstone deals with the load and is designed to just sit on the existing masonry what ever it is

 

[RonnyRaygun]

Bouba, you just need to ensure that the pad stone is of a sufficient size that the load is spread sufficiently that the compressive strength of the masonry isn't exceeded.

Note that the compressive strength of the masonry is considerably less than the compressive strength of the bricks.

 

[Bouba]

7x4 2.6 metre with 200mm on each side.
Pillar left from wall on either side= 55 cm.
Padstone 215x100x 450 long

 

[tony1851]

Working backwards;

The Phorpres bricks will have a crushing strength of around 20N, but as RR pointed out, the brickwork as a whole will be less, approx. 6N or thereabouts.
If your pad is 100 x 450, then the maximum design load the brickwork would carry in theory will be approx. 96 KN, about 9 tonnes?

Probably well in excess of your actual design loading, if it's only supporting a half-brick wall and a floor.

If the beam is only bearing 200, and the pad is 450 long, the stress distribution on the brickwork below the pad will not be even, but will be higher near the opening and lower further in. Even so, you should be well within the limits here. Personally, I'd cut the pad in half and make it 225 long and save a lot of graft.