Split chair seats can be repaired with a series of 1 8 inch dowels wooden pegs along the break and reinforced with metal mending plates.
Repair split wooden chair seat.
Drill holes for the dowels in each side of the broken seat about 1 inch deep or as deep as possible and spaced about 4 to 6 inches apart.
A split seat on a wooden chair often sends it to the junk heap but this solution may save one at your house.
If you split the rear legs or your seat is shield shaped try using a band clamp around the seat to close the split.
Use a wood stir stick to have more leverage and to protect the finish of the wood from scratches and dents.
How to repair cracks in a chair seat.
Instead they glue planks together edge to edge to form a single plank wide enough.
Then add some pressure across the grain anywhere you can get a clamp to hold.
Old glue that remains on the frame can be chiseled off.
Furniture makers seldom fashion chair seats from a single piece of wood.
If nails were used previously in the repair of the split chair seat pull them out with the help of angled pliers.
With the seat clamped up reassemble the chair.
The seat must be completely removed for doweling.