New foundations overlapping old ones?

[loply]

Hi folks,

I've got a situation where I want to knock down a garage/outhouse and build a new one adjoined to the building.

Trouble is the new foundations partially overlap the old ones (see image below).

Generally speaking is there any option other than to smash up and remove the old founds? Particularly on the northernmost strip where they run parallel and more or less on top of each other. It's about a 6m run.

If they do need smashed up, reckon it's at all practical by hand with a breaker? Or does it need a JCB with a breaker on the end?

Cheers,
Rich

 

[ban-all-sheds]

This was built without the aid of JCBs.

 

[loply]

how many slaves and over how many generations?

Anyway, that might have been aliens.

 

[ban-all-sheds]

"It is believed to have taken about fifteen years to build, employing between 800 and 1,000 workers."

I've been there a couple of times, and it's a seriously impressive piece of work. Can't help wondering if this nearby structure will still be standing in 2000 years time...

 

[TheVictorian]

I visited the Pont du Gard last year and was amazed by it, really is an epic piece of Roman engineering.

 

[ban-all-sheds]

I first went before it became a proper tourist attraction which you had to pay to visit. Just found somewhere to park and walked to it. Back then this gate wasn't there

and you could get up onto the top if you wanted.

As you say - epic Roman engineering. Mostly built without any mortar. Even more impressive is that it's only part, of course, of a much longer aqueduct, one stretch of which had to be built with a fall of less than 1:14000.

 

[noseall]

If they do need smashed up, reckon it's at all practical by hand with a breaker? Or does it need a JCB with a breaker on the end?

A lot will depend upon how thick the concrete is.

We are using a 3 tonne digger presently and it will hoof out huge lumps of concrete with ease.

A 1.5 tonne digger will also remove surprisingly large chunks but requires a bit more skill and savvy digger positioning for it to work.

It is handy to have a breaker so that you can fracture the concrete into smaller sections for ease of removal and handling, even though you have a digger on site. You will need to make an 'incision' into the concrete so that you can make a start with the digger bucket, otherwise it will just skid off the conc'.

 

[loply]

I guess I need to make a test hole to find out how far down and how massive they are.

Any guesses how thick the concrete is likely to be? Old double garage, probably 70s era, used to belong to the council.

 

[noseall]

I guess I need to make a test hole to find out how far down and how massive they are.

Any guesses how thick the concrete is likely to be? Old double garage, probably 70s era, used to belong to the council.

Prolly aboot 10" thick, max. We have had one or two surprises with foundations of this age but fortunately they are rare. I would imagine they will hoof out with a 1.5 tonne excavator.

Be aware that there may be things running through the foundation concrete that you may not want just ripping out.