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Deck screws how many per board per joist

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Forum topic by MHW posted 05-09-2017 04:33 PM 2267 views 0 times favorited 10 replies Add to Favorites Watch
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MHW

8 posts in 191 days


05-09-2017 04:33 PM

Topic tags/keywords: deck screws

Do I really need 2 screws per joist on my deck boards rather than doing 2 screws for one joist and then one on the next joist? 10 ft p/t boards on 16” joists.


10 replies so far

View crank49's profile

crank49

4022 posts in 2755 days


#1 posted 05-09-2017 04:52 PM

Two screws to prevent cupping of deck boards.

View dday's profile

dday

127 posts in 1213 days


#2 posted 05-09-2017 05:07 PM



Two screws to prevent cupping of deck boards.

- crank49

this

View JCamp's profile

JCamp

417 posts in 334 days


#3 posted 05-09-2017 05:13 PM

2 is fine as long as its a 6inch wide board. I have, and have known ppl, that swear by using 3 screws in a 6in wide board. Slightly over kill but they will not move

-- Whatsoever thy hand findeth to do, do it with all thy might

View johnstoneb's profile

johnstoneb

2560 posts in 1956 days


#4 posted 05-09-2017 05:55 PM

You don’t say how wide. 4” 1 screw alternating side would work. 6” you need 2 per joist.

-- Bruce, Boise, ID

View LiveEdge's profile

LiveEdge

556 posts in 1404 days


#5 posted 05-09-2017 06:05 PM

If you are going to go through the work of doing your own deck, pay the extra $10 in screws and do the extra time to put the additional screws in. It’s not the place to try to cut corners.

View DrDirt's profile

DrDirt

4389 posts in 3526 days


#6 posted 05-09-2017 07:06 PM

Depends – There are also hidden fastners which is what I did with my decking… where there is a biscuit made out of plastic with a built in spacer, so that you would hold the board by its edges

https://www.mcfeelys.com/screw-fastener-web-store/deck-clips-deck-plugs/live-cylinder-eb-tys-with-screws-100-pk.html

Then I use two screws per board on the joist at each end.

For direct screw down… the screws hold the board in place, and prevent cupping, thus 2 is standard.

-- 'Political correctness is fascism pretending to be manners' ~George Carlin

View OldCoach's profile

OldCoach

47 posts in 658 days


#7 posted 05-10-2017 02:11 AM

Not to change the subject, but I built a deck 16 years ago using deck screws, the green ones. Never have I been so disappointed in a product. I cannot tell you how many screws failed due to rust and decay. I used two per joist on 6” wide boards by the way.

Last fall I removed this deck and replaced it with concrete. I would estimate that 90% of these deck screws were decayed to the point where they were no longer doing the job they were designed for. Plus the fact that now I have all this deck wood that I have to spend so much time just trying to get pieces of screws out in order to reuse for planter boxes or any other projects I want to use it for. I used 35 pounds of screws to build this deck. After demo, I have less than 5 lbs of screws that are not decayed that I can reuse on these other projects.

If I had to do it all over, I would use nails. Just my experience.

-- Play cowboy on weekends and make sawdust in between when not watching football

View Matt Hegedus's profile

Matt Hegedus

144 posts in 577 days


#8 posted 05-10-2017 04:19 AM

Built about 20 decks start to finish with a crew, and we always used 2 screws on wood decks, (torx head outdoor screws, predrilled with an 1/8” pilot hole) UNLESS we were using composite decking boards with hidden fasteners. Hidden fasteners required 1 screw per joist, but these boards were not prone to cupping.

-- From Pittsburgh, PA

View rwe2156's profile

rwe2156

2662 posts in 1264 days


#9 posted 05-10-2017 01:45 PM

Countersink/predrilling make for a professional job. This is especially critical on butt ends.

And don’t over screw the screws even counter sinking this can result in splitting.

I think sanding and using a stain/sealer really makes it a good job, even with PT wood.

I’ve built quite a few decks and I really think 12D stainless steel ring shank nails are worth considering.

-- Everything is a prototype thats why its one of a kind!!

View ArtMann's profile

ArtMann

635 posts in 600 days


#10 posted 05-10-2017 04:33 PM

All I want to say is that I have built several decks and I agree 100% with rwe2156. Ring shank nails are great but I would shoot them with a pneumatic nail gun. I am too lazy to hammer them in.

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