Re: raft vs strip (sorry, don't have the patience to dissect your post!), can you explain why raft foundations are not the norm if they are so much faster, easier and cheaper? They are obviously more structurally sound which makes it even more intriguing.
I had planned on strip foundations. However, I just got a call this minute from the earth mover saying that they've hit rock and will require a rock breaker. Does this mean I will have to go with a raft foundation?
This side of the Shannon is almost exclusively rafts, for the reasons above.
Someone - or you - needs to get a look and see how much is involved.
galwaytt,
I am amused that you think a raft foundation is cheaper than strip foundations.
------- Declared interest: we build SIP houses on rafts all the time ----
Have a look at one of our standard details, as an example:
Raft foundation (also note quality of ground works - grass still intact.....)
Engineer & builder recommended a raft foundaton for my self-build. The reason they agreed on this was due to the changeable nature of the soil across the site. In our case the raft foundation is the better option & will reduce settlement cracks etc. Will cost approx. 1k more than strip but we believe it is money well spent in our case.
Syd, I've found the price of steel has come down dramatically from the highs of c. E1000 not too long ago. Haven't had cause to buy cut and bent steel lately, but A393 mesh is literally half the price I paid a year ago. What it could possibly also be is the chippies labour rates for the formwork which they might price on time now rather than M2.
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