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Lay new slab for extension over existing path.

Lantus · 2016-04-09 19:35:32

We are building an extension and there is 180mm from the top of the path to the ffl of the existing slab. Plenty of room for insulation and some screed given its just a few sq metres. Has anyone experience of just building over this rather than dig it all up?

09-04-2016 7:35pm

#1

Lantus

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We are building an extension and there is 180mm from the top of the path to the ffl of the existing slab. Plenty of room for insulation and some screed given its just a few sq metres. Has anyone experience of just building over this rather than dig it all up?

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#2 09-04-2016 8:41pm

893bet

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You are digging foundation for walls?

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#3 09-04-2016 9:20pm

air

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Dig it up or you risk differential settlement and problems down the line.

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#4 09-04-2016 9:26pm

Lantus

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It's not for foundations. Just the ground floor slab. Of the 35m2 we are extending its about 3 m of path that would be easier not to dig up.

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#5 09-04-2016 9:29pm

Metric Tensor

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Ask your engineer. He's the one designing and certifying the foundations.

If he's happy to go with it then you're fine although I STRONGLY doubt he will be!

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#6 09-04-2016 9:31pm

air

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If it's 3m2 out of 35 why are you even asking.
If your builder is getting lazy about something as fundamental as this this I'd consider getting a new one.
Most paths are laid pretty thinly in my experience.
It could probably be broken out in no time at all.

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#7 09-04-2016 10:58pm

BryanF

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http://www.boards.ie/vbulletin/showthread.php?t=2055036302

Refer to section 1.5

Thread closed

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