The only disadvantage of weep holes is that they have to be inspected periodically as the weep holes get filled up quickly due to their small size.
Mortar goes into these holes when the holes make a weep hole in the brick masonry. As a result, mortar is also fixed and this waste is fixed with mortar and partially or completely closes the weep holes.
Rats and other insects get inside through these weep holes.
Mesh has to be provided to prevent rats and other insects.
The net, which is fixed to prevent rats and other organisms from entering the weep holes, closes the weep holes by trapping debris in the weep holes.