The inspector was down today, he checked over the footings and didn't
seem too unhappy. Unfortunately the holes I dug for him to inspect the
footing seem to be on clay near the house. His suggestion as a fix if
the clay goes any deeper, is to tie a lintel into the house foundations
and sit it on the footings further down. This would tie the porch into
the existing footings. So I guess you're right, lintels can be used in
conjunction with existing footings. Assuming the lintel is up to spec
as are the footings.
I must admit, I'm not sure how much I like this idea. If the front of
the porch starts to settle it's going to have a significant upwards
thrust on the column the lintel will be tied into.
But I've dug down another foot and seem to go through the clay layer.
So hopefully no work with have to be done to the main building.
Not only that, but as I've dug another foot down (must be 100-120cm
under ground now), I've exposed some rubber trunking. I can't make out
what it is, all I can feel and see (before the hole fill up with water
and sand) is that it's rectangular and about 5cm wide, but 15cm deep, at
a bit of a strange angle. Fingers crossed it's just rubbish thrown into
What a faff.
=================================Since the inspector has effectively endorsed the use of a lintel I would
suggest that you get your builder to tell you exactly how he intends to
implement the job since the suggestion came from him originally.
Personally I wouldn't want to risk any disturbance to the house footings
by tying in new to old for something as minor as a porch.
It would be sensible to get a written statement / description from the
builder to ensure that he accepts responsibility for the modifications
made necessary by his error. Photographs would be a sensible precaution,
although I doubt if there's any serious risk of things going wrong if the
lintel is properly installed. I would ask your builder about my
suggestion of a possible pier + block foundation at the mid point of the
lintel since it appears that the lintel will need to be about 2.8 metres
As far as the rubber trunking is concerned, I have no idea what it could
be but you could try tracing it in a narrow trench until you find what it
is - better to be safe than sorry.
Using Ubuntu Linux
In all honesty, I really don't want to tamper with the existing
footings. I'd have to give very serious consideration to even having
the porch built if that was the case. Either that or reduce the porch
to a much smaller storm shelter type thing or UPVC conservatory.
I contacted the building inspectors just for some advise and have found
that the porch does require building regs after all. So it will get a
full inspection and rectification work carried out accordingly. I'll
post here (as a new thread) what the building inspector came back with
and the actual work done.
But from what I was explaining over the phone, he said it will require
either dowels (not sure if I've spelled that right), to bind the two
footings. Or as an alternative, dig another trench to the correct depth
by the existing footings and do another pour to 15cm above the existing
footing. I've had to dig an inspection trench for the inspector, the
concrete down there is between 20-30cm deep (mostly 30cm). Shame it's
just too far off centre to use.
I guess the cost of a load of concrete will probably determine the
solution they go for. I guess it would probably be about 600l.
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