Most of the drainage problems we are called to in Kettering are above ground rather than below it, and they trace back to how cheaply the rainwater system was originally specified.
On the artisan housing the gutters and downpipes were sized for the rainfall patterns and the roof areas of the day, and sized tightly. A single small downpipe frequently serves an entire roof slope. That was adequate for a long time. It is noticeably less adequate now, and the symptom is a gutter that copes for eleven months of the year and overflows in every genuinely heavy downpour, soaking the wall head at the same spot each time.
Because it only happens in heavy rain, people rarely see it happen. What they see is the damp patch inside, two or three years later, which then gets diagnosed as rising damp, penetrating damp or a wall problem, and treated at considerable expense. The cause is a hundred millimetre gutter doing the work of a hundred and twenty five.
So on this stock we look at the rainwater goods before we look at the wall. Upsizing a gutter, adding a second outlet or correcting a fall that has dropped over a century is cheap work with a large effect, and we would far rather sell you that than a chemical injection you did not need.
On the larger houses the roofs are bigger but the goods were specified properly, and the recurring issue is condition rather than capacity: cast iron that needs painting inside and out, and joints that need maintaining.
Our drainage work page covers surveys, repairs and new connections.