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Leak in house

There is a leak on the corner of the house when it pours with rain. At first we thought it was due to blockage of the drainage in the ranch slider but a handyman has advised water appears to be coming up from the ground. Gib board is not wet. House was built 2005 - constructed by polystyrene with plaster (with a cavity). Is someone available this Saturday afternoon 6th Sept to come and have a look and let us know what it might be due to? Willing to pay up to $80 call out fee.