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Holding strength of pocket hole joinery

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Forum topic by pingpingpang posted 12-12-2012 08:04 AM 1758 views 0 times favorited 18 replies Add to Favorites Watch
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pingpingpang

12 posts in 746 days


12-12-2012 08:04 AM

I’m planning on doing a project that will involve using pocket hole joinery to connect a sheet of 3/4 Oak plywood to 1×4 Oak boards (as stair tread edge) for stair treads. Those stair treads will be connected on top of the old treads by liquid nail. I am just wondering if pocket hole joinery has enough holding strength. Or I just have a bad idea.
Thanks


18 replies so far

View Monte Pittman's profile

Monte Pittman

15513 posts in 1091 days


#1 posted 12-12-2012 09:57 AM

Should work. Don’t be cheap with number of screws used though.

-- Mother Nature created it, I just assemble it.

View bluekingfisher's profile

bluekingfisher

1107 posts in 1732 days


#2 posted 12-12-2012 10:02 AM

You may have issue with the overall rise of the tread. I looked into doing exactly that but was advised the additional rise created by the thickness of the new boards could create a trip hazard. Perhaps those providing the information were being a little over cautious, however they were building professionals.

Perhaps you should seek guidance on this…..just a thought!

-- No one plans to fail, they just, just fail to plan

View Rick  Dennington's profile

Rick Dennington

3613 posts in 1947 days


#3 posted 12-12-2012 02:12 PM

????..........???

-- " I started with nothing, and I've still got most of it left".......

View crank49's profile

crank49

3524 posts in 1724 days


#4 posted 12-12-2012 03:03 PM

If you add 3/4” to the top of every step there is no increase in the rise except the first and last treads will have more or less rise than all the others. All the rest of the steps are the same relative to each other.

Building code usually requires no more than a 1/4” difference in any step within a stair. It can be made stricter by local codes.

I have been living in my house for 36 years and just discovered a couple years ago that the steps between my great room and the rest of the house are almost 1” different from top to bottom in both rise and run. Never knew it till I went to replace carpeted steps with hardwood and had to cut new risers and treads. I think the trip hazard must be over rated.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

View Earlextech's profile

Earlextech

1024 posts in 1443 days


#5 posted 12-12-2012 04:23 PM

Pocket hole joinery with glue is plenty strong for that situation.

-- Sam Hamory - The project is never finished until its "finished"!

View a1Jim's profile

a1Jim

112936 posts in 2330 days


#6 posted 12-12-2012 04:33 PM

ditto Earlextech’s

-- http://artisticwoodstudio.com Custom furniture

View Loren's profile

Loren

7826 posts in 2401 days


#7 posted 12-12-2012 05:04 PM

If I am visualizing this well, you’d be driving pocket screws
into the back side of the plywood with the points coming
through and pointed at the flush corner of the solid oak
lipping. There won’t be a lot of material there to shape
without running into screw ends.

Gluing alone is sufficiently strong, but nails or countersunk
and plugged screws through the front edge allow one
to forgo a lot of work with clamps.

I would not do it with pocket screws, personally.

-- http://lawoodworking.com

View pingpingpang's profile

pingpingpang

12 posts in 746 days


#8 posted 12-12-2012 05:12 PM

Thanks for all replies.
Basically I want to put two pieces wood together by using kreg pocket hole jig and glue in order to get a stair tread. The edge of a stair will be 3.5 inch oak.

And Building code is now my concern.

View Loren's profile

Loren

7826 posts in 2401 days


#9 posted 12-12-2012 05:25 PM

The veneer on ply is very thin and not rated for
flooring and will not hold up.

-- http://lawoodworking.com

View pingpingpang's profile

pingpingpang

12 posts in 746 days


#10 posted 12-12-2012 05:33 PM

Loren,
You are right. I may need to change my plan

View DS's profile

DS

2132 posts in 1173 days


#11 posted 12-12-2012 05:36 PM

Also, keep in mind that most fasteners are only there to hold things until the glue dries.

Glue isn’t typically an optional accessory. (Just don’t tell some of those production guys.)

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

View MrRon's profile

MrRon

2991 posts in 1996 days


#12 posted 12-12-2012 10:45 PM

I would not use oak plywood or any plywood for that matter. The veneer on the plywood is much too thin to stand up to foot traffic.

View Mark Smith's profile

Mark Smith

498 posts in 793 days


#13 posted 12-12-2012 10:51 PM

Good catch Loren, I wasn’t even thinking of that either, but you are right.

-- Mark Smith, Tracy, CA., http://www.markscustomwoodcrafts.com

View 404 - Not Found's profile

404 - Not Found

2544 posts in 1722 days


#14 posted 12-12-2012 11:01 PM

Could you not use some semi solid flooring instead for the treads?

Just on the pocket screws, I recently ‘dismantled’ an early bookcase I made which was put together with pocket screws. It took some full on blows with 20oz Estwing to take apart and the material broke before the joints did in a couple of places, if that gives you an idea of their strength.

View pingpingpang's profile

pingpingpang

12 posts in 746 days


#15 posted 12-12-2012 11:11 PM

I will use my solid flooring for wood treads.

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