ianfish Posted September 29, 2021 Share Posted September 29, 2021 (edited) I have been carefully and steadily taking a 15 year old structure down that came close to our 1930's Metro style semi. The original kitchen house exterior corner wall will in time be removed being replaced with a 143mm steel column, rather than having heavier RSJs and the house "hanging" on the corner. This is for a bigger newer extension. Our SE has specified a new cast pad to support the column steel. What would people from here look at beginning this element of demo-underpinning? Your thoughts experience welcome Edited September 29, 2021 by ianfish add image Link to comment Share on other sites More sharing options...
saveasteading Posted September 29, 2021 Share Posted September 29, 2021 39 minutes ago, ianfish said: beginning this element of demo-underpinning? I don't really understand the question. Do you mean removing the brick corner and replacing with a steel column? Underpinning is horrible and expensive. Much easier to dig a hole from above. 1 Link to comment Share on other sites More sharing options...
ianfish Posted September 29, 2021 Author Share Posted September 29, 2021 Just now, saveasteading said: I don't really understand the question. Do you mean removing the brick corner and replacing with a steel column? Underpinning is horrible and expensive. Much easier to dig a hole from above. Its the sequence i'm after how would people tackle it. Yes the original corner is being removed in the final finish and a steel column with RSJ into the walls will be fitted, that bit I get. Its the need for the concrete pad and how to sequence its construction im after ideas for. Link to comment Share on other sites More sharing options...
saveasteading Posted September 29, 2021 Share Posted September 29, 2021 Prop the wall up on both sides. There are special fittings to go into the mortar beds/ Remove brick corner , dig hole and fill with concrete. Fix column, bed wall onto column. Remove props gently while holding breath. Move on to next area. Standard work for skilled builder. Scary for novice, and rightly so. What is above? another floor or a roof. Link to comment Share on other sites More sharing options...
ianfish Posted September 29, 2021 Author Share Posted September 29, 2021 (edited) 10 minutes ago, saveasteading said: Prop the wall up on both sides. There are special fittings to go into the mortar beds/ Remove brick corner , dig hole and fill with concrete. Fix column, bed wall onto column. Remove props gently while holding breath. Move on to next area. Standard work for skilled builder. Scary for novice, and rightly so. What is above? another floor or a roof. 1st floor.. Edited September 29, 2021 by ianfish add image Link to comment Share on other sites More sharing options...
ProDave Posted September 30, 2021 Share Posted September 30, 2021 Whilst I am all in favour of DIY work, I am not sure knocking out and propping up the corner of the house on a post is a DIY job. 1 1 Link to comment Share on other sites More sharing options...
Dave Jones Posted September 30, 2021 Share Posted September 30, 2021 it doesnt look that bad, acro the lintle in the door and a couple strongboy on the flank wall. I'd question why the steel in the first place and leave the corner as is, what is it going to be carrying ? 1 Link to comment Share on other sites More sharing options...
Marvin Posted September 30, 2021 Share Posted September 30, 2021 Pad foundation under a corner with a door opening to one side. I would want to have my method checked before commencing. How big does the structural engineer say the pad has to be? Link to comment Share on other sites More sharing options...
ianfish Posted September 30, 2021 Author Share Posted September 30, 2021 1 hour ago, Dave Jones said: I'd question why the steel in the first place and leave the corner as is, what is it going to be carrying ? We dont want a large or anything too square in what will be the middle of our new kitchen. I also didnt want to just have horizionfal rsj supports leaving the corner of the house just balanced. The column is part of the SE spec which is what id envisaged Link to comment Share on other sites More sharing options...
ianfish Posted September 30, 2021 Author Share Posted September 30, 2021 58 minutes ago, Marvin said: Pad foundation under a corner with a door opening to one side. I would want to have my method checked before commencing. How big does the structural engineer say the pad has to be? SE suggests a minimum of 1400 x 1400 by 500mm deep Link to comment Share on other sites More sharing options...
Dave Jones Posted September 30, 2021 Share Posted September 30, 2021 Well, you could make a feature of the wall/pillar and put the new RSJ on the outside to save the cost/expense/hassle. It wouldn't make the pillar that much bigger and would save you a packet. take some ideas https://www.houzz.co.uk/magazine/how-to-work-around-a-structural-pillar-in-your-kitchen-extension-stsetivw-vs~76437319 1 Link to comment Share on other sites More sharing options...
saveasteading Posted September 30, 2021 Share Posted September 30, 2021 3 hours ago, ProDave said: I am not sure knocking out and propping up the corner of the house on a post is a DIY job. If you have not done this sort of thing before, then this is not the one to start with. At least get an experienced builder to do the propping and column work, and you can assist. There is the window, too, and so there isn't much wall there anyway. Perfectly doable but you don't know how much you don't know....yet. Think of the worst that could happen. Now ask your house insurer if you would be covered. 1 Link to comment Share on other sites More sharing options...
Marvin Posted September 30, 2021 Share Posted September 30, 2021 1 hour ago, saveasteading said: If you have not done this sort of thing before, then this is not the one to start with. At least get an experienced builder to do the propping and column work, and you can assist. There is the window, too, and so there isn't much wall there anyway. Perfectly doable but you don't know how much you don't know....yet. Think of the worst that could happen. Now ask your house insurer if you would be covered. +1 Link to comment Share on other sites More sharing options...
Mr Punter Posted September 30, 2021 Share Posted September 30, 2021 Before you do anything, tidy up the site! 1 1 Link to comment Share on other sites More sharing options...
ianfish Posted September 30, 2021 Author Share Posted September 30, 2021 Just now, Mr Punter said: Before you do anything, tidy up the site! Just now, Mr Punter said: Before you do anything, tidy up the site! You know I had not thought to do that........ Link to comment Share on other sites More sharing options...
Mr Punter Posted September 30, 2021 Share Posted September 30, 2021 1 minute ago, ianfish said: You know I had not thought to do that........ Is the rest of the lean-to coming down? Link to comment Share on other sites More sharing options...
ianfish Posted September 30, 2021 Author Share Posted September 30, 2021 Just now, Mr Punter said: Is the rest of the lean-to coming down? No - that remains Link to comment Share on other sites More sharing options...
ianfish Posted October 5, 2021 Author Share Posted October 5, 2021 Two trips to the NEC in the next few days.. UK Construction week tomorrow then back for Grand Designs Link to comment Share on other sites More sharing options...
ianfish Posted July 10, 2022 Author Share Posted July 10, 2022 steels in...passed off by BC too Link to comment Share on other sites More sharing options...
ianfish Posted July 10, 2022 Author Share Posted July 10, 2022 Link to comment Share on other sites More sharing options...
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