I am refering to 'self certifying' by NHBC. The NHBC is reguarly exposed by the media to be nothing more than an insurance/trade company funded/(in effect owned) by the large building companies. Owners of houses with major defects have often found their NHBC 10 year garrantees to be effectively worthless. If anyone has missed the media coverage concerning the NHBC just google 'NHBC scam' to get started.
Wall position on foundations
- Thread starter plantyroo
- Start date
I am refering to 'self certifying' by NHBC. The NHBC is reguarly exposed by the media to be nothing more than an insurance/trade company funded/(in effect owned) by the large building companies. Owners of houses with major defects have often found their NHBC 10 year garrantees to be effectively worthless. If anyone has missed the media coverage concerning the NHBC just google 'NHBC scam' to get started.
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Building regs, nhbc etc are guidlines for any old bod to come along and build something without the need to actually do any design work.. so in 20yrs the building will still be there..
Walls can be placed eccentrically to foundations (do it all the time for large commercial/industrial units).. but doing this increases the bearing pressure on the edge of the foundation exponentially.. so for standard cavity walls its not normal practice to put the footing anywhere but under the wall centrally..
In the end of the day you are looking to have the centre of gravity of the wall within the middle third of the strip footing width..
Inner leaf loading tends to be about 2x that of exterior brickwork..
So either get an engineer involved to calc if the footings are ok for the bearing pressure, or do as suggested and increase the footing so they are central and therefore no need to check design..
Walls can be placed eccentrically to foundations (do it all the time for large commercial/industrial units).. but doing this increases the bearing pressure on the edge of the foundation exponentially.. so for standard cavity walls its not normal practice to put the footing anywhere but under the wall centrally..
In the end of the day you are looking to have the centre of gravity of the wall within the middle third of the strip footing width..
Inner leaf loading tends to be about 2x that of exterior brickwork..
So either get an engineer involved to calc if the footings are ok for the bearing pressure, or do as suggested and increase the footing so they are central and therefore no need to check design..
Just bear in mind that the loads are probably very small here and the foundation is probably twice as large as it needs to be.
Having said that the person that should decide, really, is the designer that carries the PI insurance. Everybody else, including the BCO, is irelevant.
If the BCO does say it's OK I suppose you could ask him for a copy of his PI insurance - tell him it's just in case something goes wrong. You might want to stand back when you do in case you get injured in the back-peddelling.
PS. If I remember correctly, it's the centrum of the wall that should be directly on the centre of the foundation. But I might have dreamed that bit.
Having said that the person that should decide, really, is the designer that carries the PI insurance. Everybody else, including the BCO, is irelevant.
If the BCO does say it's OK I suppose you could ask him for a copy of his PI insurance - tell him it's just in case something goes wrong. You might want to stand back when you do in case you get injured in the back-peddelling.
PS. If I remember correctly, it's the centrum of the wall that should be directly on the centre of the foundation. But I might have dreamed that bit.
Youtube it!
Had to look that one up, http://www.thefreedictionary.com/centrum
Maybe you mean centroid, http://www.thefreedictionary.com/centroid
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