Hardwood deck screw selection

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Forum topic by panamawayne posted 08-31-2017 12:47 PM 413 views 0 times favorited 2 replies Add to Favorites Watch
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72 posts in 2268 days

08-31-2017 12:47 PM

Hey guys, I’m constructing a roof with hardwood Cumaru beams (similar hardness to Ipe) and Spanish Cedar 6 inch wide planks which are a mid hardness grade wood.

I was looking at the GRK R4 screws but am wondering if they or any type of screw with the cutting style point can be used without pre drilling? I don’t want to spend extra money on fancy screws if I’m going to have to pre drill anyways.

Just wondering what your experiences may be in regards to this?

I’m out of country so I can’t just go to Home Depot and buy samples of each to try.


2 replies so far

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5925 posts in 4052 days

#1 posted 09-01-2017 12:25 AM

If you are using a wood as hard as IPE, you are going to need strong screws. The GRK screws will be the strongest you can get, but may still be too weak for an IPE type hardness.I would just try driving them and if they start to break, then the wood is too hard and you will have to pre-drill. Don’t use stainless steel screws unless you pre-drill. They are weaker than the GRK screws. I am currently putting down a deck of southern yellow pine and using the GRK screws. They were recommended by my lumber yard over Stainless steel. SYP is probably a lot softer than your cumaru, so prepare to pre-drill no matter which screw you use.

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72 posts in 2268 days

#2 posted 09-01-2017 12:28 AM

Thanks for the response, kinda what I was thinking but wanted to hear it from someone else.

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