What size biscuit to use?

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Forum topic by EFA posted 1867 days ago 1392 views 0 times favorited 5 replies Add to Favorites Watch
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6 posts in 2003 days

1867 days ago

I’m working with 5/8” baltic birch and have a several T-joints. Should I use #10 or #20 biscuits?

Thank you,

5 replies so far

View LesB's profile


1058 posts in 2038 days

#1 posted 1867 days ago

You didn’t say but I will assume you are working with a face frame??
Biscuits won’t add much in the way of strength if that is why you are using them and the smaller size will help even less. They are best for keeping things aligned as you glue them up.
If they won’t show I would use Kreg pocket holes and screws to hold it together. Even if they are visible you can plug the holes.
If you can’t use the screws and still want to strengthen the joint consider dowels inserts or there are other joints you can make, such as lap joints, and mortise and tenon.

-- Les B, Oregon

View Greg The Cajun Box Sculptor's profile

Greg The Cajun Box Sculptor

4927 posts in 1903 days

#2 posted 1866 days ago

I would use the #10’s. The 20’s might be a little deep for the 5/8 if you are butt joining them.

-- Every step of each project is considered my masterpiece because I want the finished product to reflect the quality of my work.

View Moron's profile


4666 posts in 2488 days

#3 posted 1866 days ago

2 cents

I politely and respectfully dissagree with LesB but not to say that there arent stronger joinery techniques out there

10s or 20s will work

-- "Good artists borrow, great artists steal”…..Picasso

View LesB's profile


1058 posts in 2038 days

#4 posted 1866 days ago

4 cents
There have been several test done by various magazine on joinery and the conclusions were pretty unanimous that biscuits add very little strength to the glue joint but then again if it is glued properly the bonds are usually stronger than the wood it self. For face frames it probably makes little difference because the glue bond to the case reinforces the face frame joints. Kreg screws is still the best in my opinion and allow for faster assembly with no clamping.

-- Les B, Oregon

View GaryK's profile


10262 posts in 2583 days

#5 posted 1866 days ago

I always use the largest I can get away with.

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

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