Best Fasteners for Joist Sistering
I have several sagging joists which I’d like to raise with sister joists. The joists are southern pine, interior 2x10x14’6″ and presently sag approx. 1″.
What I’m not certain is which is the best fastener. The existing joists are 70 years old and in my experience older wood grows brittle and often splits when hand nailing. Even though pre-drilling for bolts is tedious I would think bolts would perform better than nails or screws because the wood is less likely to split.
My list of options would be one of the following, and the attached image shows the spacing.
1. 1/4-20 Bolts with washers and nuts
2. 3/8-16 Bolts with washers and nuts
3. HeadLok #10×2 7/8″ Screws
4. Spax #10×3″ Torx Drive Screws
5. 10D x 3″ Nails
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