Underpinning interior stone walls

[markrigby3]

Hi - new to this forum, looks really good!
We are converting a stone coachhouse (approx 30 m x 6.5m) into 3 holiday cottages. Exploratory digging has revealed that the exterior walls go plenty deep enough below the required finished floor height (we are lowering it 300mm). However, the two internal stone walls which go floor to roof at ca. 6.5m in from each end, do not. Having dug down deep enough to put in compacted base (50 mm) insulation (100mm) and floor ca. 150mm with underfloor heating we have exposed ca. 150 mm of earth below the stone of the interior walls. Ground is very firm slate / clay mix. Any advice from similar situations on how best to proceed would be welcome.
Cheers, Mark

 

[Tom]

We had to underpin two interior brick walls (later additions to the house, either side of the staircase). This was necessary because we dug down to put in a Limecrete floor with UFH. It didn't cause any particular problems. We just did it bit by bit, over a period of about 4 weeks, making sure there was plenty of run between any 2 bits being done at the same time and making sure each section had gone off before proceeding to the next.

 

[Jon Maine]

Easy process with experienced advice, not advice given through this forum, you need a professional to advise if you don't know what to do. It could be a job you are capable of doing but there may be other factors that would undermine ( quite literally) any advice given over this forum. The risks to life and property are too high.

Where are you in the country?

With the correct advice followed a couple of weeks hard graft with relatively cheap materials should sort it out for you.

 

[MdB]

Welcome to the forum Mike. Listen to Jon Maine and take look at this post on the dangers of undermining your walls: http://periodproperty.co.uk/forum/viewtopic.php?f=1&t=10747&p=130793&#p130876