penetrating dampthrough solid brick wall

[pistonbroke]

I have a serious problem with penetrating damp. The house is of solid brick construction (Yellow Stocks with Lime Mortar courses)built in about the 1870's.The damp is coming in at a height of about 2-3 metres on an external corner,spreading about 1 metre on either side of the corner.The walls are Sandtexed. I've checked the brickwork and pointing,but can find no obvious faults.
Is there a waterproofing product that can be applied on top of Sandtex,or do i need to strip back the affected area to bare brick ?
Alternatively.Is there a waterproofing product that can be applied to the interior walls ?
Thanks
Barry

[stoneyboy]

pistonbroke,
Are the external walls sandtexed or are they brick?
end

[TheDoctor5]

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