dropped concrete
- Thread starter sam1987
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All you can do, is carefully chop out the pointing, between the bricks, and the slabs, clean it out, and repoint it, with sand/cement, 3 to 1. Push the new mortar, well into the gap.
Not something I would recommend, but it seems a popular shortcut in the US!
How do control/decide how much foam to pump in?
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I think it's a combination of sequential fills and guess work, probably a low expansion foam variant as well.
I don't understand how that works. Looks cool though. Perhaps it is applied under massive PSI and lifts before being able to escape.
The following makes more sense to me, but both seem to be short term fixes.
For the record, I often use expanding foam to "lock" existing skirting boards and stair strings in place, but I do so knowing that any excess will shoot out of the hole that I drilled and squirted it in to.
Nope, I would not have thought so - it just needs a small amount of pressure, spread over a large area, to create lots of lift. The use inflatable bags, to lift lorries which are on there sides. I am in my caravan at the moment, and I use an inflatable bag, under a tyre, which I then inflate to make the caravan perfectly level. Pressure in the bag, is only about 20PSI, and it is lifting maybe 3/4 of a ton.
My only question, is how they determine they have put the right amount in, to get the desired amount of lift?
Seeing as you can build roads and embankments or anything really on EPS which is really just a dense expanded polystyrene then using foam to lift a slab would seem to be an effective method, it seems popular in the States and is available here but not for the likes of garden slabs, it'd be cheaper to recast it.
I get what you are saying about the bags, but from the video, the foam is able to escape out of the sides. A bag is sealed.
Where it rapidly sets up, once exposed.
I think the UK uses more resin injection than foam so I would think that's more controllable.
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