Hi, I am currently in the process of converting my loft. I have the drawing and today they have been approved by the bc to start the work! However I have been advised by the architect to use 8+8 rsj with either side of the house to hold the new weight. But I am confused to the pad stones he has put on the drawing! He has stated to use 900mm+100+150 pad stones to support the steel however I'm sure that this size don't exist so I'm confused to how this drawing has been approved! Can some 1 give me some advice on what to use to support the 8+8 steel's please
Loft structure Help!!
- Thread starter Tyrone1990
- Start date
The length of the padstone is partly a function of the load transmitted to it by the beam, and partly a function of the strength of the bricks/blocks in your wall. Softer material, such as Celcon or other lightweight block will need a longer padstone than conventional common brick.
900 does seem very long, though. Because of the way the load disperses down through the padstone from the underside of the beam, (at 45 degrees) the normal maximum length of padstone for an 8" beam will be about 500mm; any length in excess of this could well be redundant.
Ask your designer for an explanatiion.
900 does seem very long, though. Because of the way the load disperses down through the padstone from the underside of the beam, (at 45 degrees) the normal maximum length of padstone for an 8" beam will be about 500mm; any length in excess of this could well be redundant.
Ask your designer for an explanatiion.
There was a recent thread regarding bearing sizes (bearing plate in the thread but the priciple for area of bearing is the same).
http://www.diynot.com/forums/building/bearing-plates.347786/#2605548
Once again, it seems like a very long bearing for a loft beam...
For an 8 by 8 beam, a 900 long mass concrete pad would need to be at least 350mm deep. A prestressed lintel could be less deep and a steel plate (as in the link above) much thinner still.
Or you could build a 900x375 area of engineering bricks as a pad.
http://www.diynot.com/forums/building/bearing-plates.347786/#2605548
Once again, it seems like a very long bearing for a loft beam...
For an 8 by 8 beam, a 900 long mass concrete pad would need to be at least 350mm deep. A prestressed lintel could be less deep and a steel plate (as in the link above) much thinner still.
Or you could build a 900x375 area of engineering bricks as a pad.
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