Cold joint at floor/wall leak - sealing

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Hi

After investigating a damp smell from a cupboard in my converted basement I found that there was water ingress from the wall area. Further investigation shows that a small trickle of water is penetrating at a small area where the concrete floor meets the wall as shown in the attached picture. The wall to left and above leak are not wet to the touch.

A local builder has had a look and quoted £875 to do the following, all exterior:
. Take back existing stone
. Cut back membrane around perimeter of ground level from slope to main back area
. Dig down past Dpc level
. Clean brick
. Seal brick
. Apply a water base cement to brick works
. Apply bitumen to walls
. Apply new membrane
. Place stone back to existing place (non contaminated )

However it has been suggested that it may be possible to flood the internal area with bitumen to provide an adequate seal. Anyone got any thoughts on this approach as it is obviously the much cheaper option. Maybe using something like this http://www.wickes.co.uk/invt/241217/?source=123_75

Cheers
Neil

 
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Would sealing the walls in this way cause problems with water/dampness still being present inside the brick?
 

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