Dampcourse

[geome]

I have built an attached garage onto the side of my house
The floor of the garage is 150mm below the dampcourse in the house wall (2 bricks) so these two brick courses are not going to have a damp corse in the garage side of the house wall
How can I provide a dampcourse to this area

 

[HuwRoberts]

Im not sure why this wasnt installed during construction of the garage???

Under the garage slab, do you have a Visqueen (or similar) DPM installed and if yes does this run up the side of your slab (house side)?

If yes to the above, you will probably be better off tanking (painting) the two courses of brickwork as to prevent any moisture coming into the garage and keeping it within the brickwork / cavity.

If no to the above I do not really have the answer as your cavity tray will be ushering water to the slab edge therefore making the whole slab damp.