The damp proof membranes used during construction of concrete floors are often thin and can easily become torn before they are laid rendering them ineffective.

Rising damp in concrete floors.
How to damp proof concrete floors permagard httpswwwpermagardcoukskinfrontendpermagarddefaultimagespermagardlogopng 2017 10 24 165034 2019 04 02 143340 category.
Damp proofing damp rising through concrete floor slabs is fairly common when a damp proof membrane has failed or was not installed before the floor was laid.
A relatively common example of the effect of inserting a damp proof material into a structure is the appearance of fresh rising damp in walls following the laying of a new concrete floor with a damp proof membrane.
This is most often done when a suspended floor structure is replaced by a solid floor or when a breathable stone slab floor is.
Remove obstructions from sub floor ventilators if they have become partially or completely blocked.
Rising damp is the wicking of water through the footing into the concrete wall and its evaporation inside the building.
There are however two options for damp proofing concrete floors without needing to replace the floor itself.
Rising damp increases the moisture load which leads to dampness and mold.
In principle all concrete floors should include a damp proof membrane across the whole floor area and this should be linked to the damp proof courses in the surrounding walls to provide continuity of protection against ground moisture.
Apply damping agent for existing concrete floor.
If you are replacing existing timber floors with carpet or another type of floor when renovating you should address any rising damp issues before laying down a concrete slab.
Damp rising through concrete floor slabs is fairly common causing damp issues on carpets and floor coverings warping wooden floors and increasing the likelihood of low level mould growth.
In this method damping agent such as liquid epoxy damp proof membrane is applied for an existing concrete floor system.
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