Bumpy possibly damp concrete floor

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27 Feb 2006
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Lancashire
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Hello, I have just completed on a 1910 terrace house, the house has been a rental property of years The kitchen floor is concrete and is quite bumpy, I haven't measured it, but I would guess the highest to lowest is about 10-15mm. I pulled back the Lino and there is evidence of damp / black mould, however there is no smell of damp.

Before lifting the Lino my plan was to chisel down the very highest bits, then pour a self levelling screed.
Should I be worried about this damp? how can I confirm if this is historic damp, or an ongoing issue?

My current plan is to dispose of the Lino, give it all a good scrub with bleach, and then let it dry for a few days.
what then? buy a damp meter?

if it is damp, can I buy a waterproof seal to apply before/after the self level? or am I in for an expensive excavation laying a new DPC and slab?





IMG_4903.jpeg
 
You think about liquid membrane.
Like drybase?
I've seen tilers use it but I haven't.
 
OP,
Its possible that the concrete floor was poured without using a DPM (membrane).
Remove a convenient piece of skirting and look to see if, behind the skirting, the DPM was lapped up the wall a little?
Have all the floors been made solid or do some suspended floors still remain?
 

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