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Working with Cumaru9/12
I have a interior stair build using Cumaru for treads my concern is what's the best glue to use for installing nosing returns on the treads should I wipe the edges with thinner before applying the glue and what would be the best adhesive to use for gluing the treads to the stringers would screw and plug be the best fastening method as well? After researching this wood specie apparently it is fairly unstable would sealing the treads be recommended on all surfaces before installation any advice would be most appreciative!
The stair in the photo has Cumaru treads, returns and nearby column caps. The customer did his research and rejected my Rift White Oak preference. He later confessed that he chose it because he read it was very hard and difficult to work. Just to make us work harder, even though he is the one that paid for it. Some people have strange motivations.
But the Cumaru..... It is hard and has a mind of its own that may change at any point. We saw the tread returns stay tight for the 3 years I had access to the stairs. However, we made flat, glued for width, caps for the 'columns' nearby, and those developed splits and cracks- along both glue lines and in the wood. Shrinkage and over zealous nailing that allowed no movement were to blame, but it never would have happened with other woods.
As one person said when all done and in place "What an ugly wood!"
David S. the decorator has greatly differing tastes than I do. Ugly wood fits right in.
More importantly than the wood being too hard and checking. Who carved the bottom newel?