Securing subfloor planks to floor joists

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VanTry2DIY
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Securing subfloor planks to floor joists

Post by VanTry2DIY » Wed Aug 21, 2019 1:33 pm

Hi all,
We are almost done securing and leveling the subfloor in the first room of a second story hardwood flooring project. The subfloor planks are varying lengths of 1.5" x 5" tongue and groove. Since some planks were loose, we secured them to the joists as needed with 3" decking screws.

My question is on guidelines for attaching these planks to the floor joists--is there any risk of weakening a floor joist by having too many screw holes in it? Could fastening the planks to a joist in too many different places inhibit its function or natural movement? Is it OK to add screws to the middle of a floor plank, or should they only be at the ends? Anything else we should be careful of?

Thank you for any input!
Attachments
20190821_142444.jpg
Additional fasteners - countersunk 3" exterior screws
20190821_142444.jpg (238.66 KiB) Viewed 125 times
20190821_142427.jpg
20190821_142427.jpg (223.93 KiB) Viewed 125 times

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Shannon
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Re: Securing subfloor planks to floor joists

Post by Shannon » Wed Aug 21, 2019 1:55 pm

They need to be secured to every joist. A couple screws at each joist is enough. Also I would pull any old nails you find. Other then that you should be fine.
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A. Spruce
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Re: Securing subfloor planks to floor joists

Post by A. Spruce » Wed Aug 21, 2019 8:21 pm

Agreed. 8-)
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VanTry2DIY
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Joined: Sun Mar 31, 2019 12:33 am

Re: Securing subfloor planks to floor joists

Post by VanTry2DIY » Thu Aug 22, 2019 9:20 am

Many thanks Shannon and Spruce for your input. If each plank should be secured at every joist, it seems they were woefully under-secured when the house was built. Most planks are blind nailed at the ends only. Someone previously added screws in some places, but because they did not countersink the holes, those screw heads are now the highest points on many planks and will need to be redone.

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