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It’s a bit ambiguous. Two courses above floor level in the garage (what I’d interpret it to mean), or two courses above the level of the soil.
I’d imagine you’d want to tank the inside to above the soil level, but I’d imagine you’re after a moisture level below what most people would find acceptable for a garage.
Nef
@Dammit
Garages - built in IIRC 1932 I'm very doubtful that there is a DPM under the slab.
Whilst the site is on top of a hill, the soil in the garden that backs onto the garages is around a metre above the floor level in the garage.
I described this to the chap quoting for grinding and sealing the floors and he responded with this:
"They are most probably right that there would be no damp course due to the age and the hill behind could defiantly be a concern for the longevity of the floor,they are also right the best way to move forward would be to use a polyurethane as that is essentially a liquid dpm.
I would approach it slightly different, I would use a polyurethane as a liquid dpm and go up at least two courses of bricks,then apply a re-enforced smoothing compound then apply the final coats of epoxy primer and paint. (please see pictures attached) although using a heavier coat of polyurethane is not incorrect in it self you do need to have that layer of concrete on top to ensure the longevity of the floor, creating the concrete polyurethane(dpm) concrete sandwich is the correct method to move forward with and will ensure any warranties in place will cover for any potential issues that may accrue."
If I read that correctly he's suggesting tanking the garage to above the level of the garden behind?