Entry XIV · Tuesday
A staircase for Gaddesden
I have been asked how we make a stair that does not creak. The honest answer is that we make it twice: once on paper, and once in the workshop with the treads dry-fitted before a drop of glue goes near them.
The flight at Gaddesden has sixteen risers and rises 2.64 metres. We started with a rod, a long pine stick marked with every riser and every tread, and carried it up and down the old stair until it agreed with the house.
A rod never lies. A drawing sometimes does.
The stringers are cut from a single oak board, so the grain climbs with the flight. Each tread is let into a housing, a groove cut with a router plane to the depth of a shilling, and held from below with a pair of wedges. Tap them home, glue the wedges, and the tread cannot move.
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