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I am securing a cantilever umbrella baseplate to a deck. The decking timber will be reinforced with a pine nog between the deck joists.

The options that I have are to use 10mm stainless steel coach screw that will be embedded into a 70mm nog.

Alternatively I can use a 10mm bolt, washer and nylock nut that will be secured through a 50mm nog.

The timber will be the same grade wet H5 pine. The deck plate is the same size and thickness, as is the material of the screw / bolt.

Which method will be stronger. I can't use a longer bolt due to the limitation of space under the decking timber in order to fit the nut.

Thanks

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  • $\begingroup$ Perhaps a plate to spread the load rather than a washer under the nog? $\endgroup$ Mar 5 at 7:55
  • $\begingroup$ can you provide a sketch of what you plan to do? $\endgroup$
    – mart
    Mar 5 at 9:33

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