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Scarfing trim joint

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Forum topic by RobS888 posted 08-13-2018 04:05 PM 454 views 0 times favorited 5 replies Add to Favorites Watch
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RobS888

2483 posts in 1961 days


08-13-2018 04:05 PM

Hi,

I have several pieces of trim to put up in a 14’ x 14’ foot dining room and all I have is rough 8’ red oak. I did a smaller room and tried butt joints (pretty bad) and a scarf joint (meh). I was adding the second piece to an existing piece. I think I’m going to try scarfing the pieces together before installing, the pieces are part of a craftsman trim approach and will only have medium walnut Danish oil on them, so caulk and paint are out to hide the joint.

I know some people use biscuits to join pieces of trim together before attaching, but I was thinking of a scarf joint with maybe a 30 degree angle.

Anyone tried anything like this?

-- I always suspected many gun nuts were afraid of something, just never thought popcorn was on the list.


5 replies so far

View rwe2156's profile

rwe2156

3069 posts in 1597 days


#1 posted 08-13-2018 05:20 PM

Glueing together and installing as one piece is definitely the way to go with trim. For scarf joints I usually use 22.5° simply because that is more reproducable setting on a miter saw.

Lots of trim guys use cyanoacrylate glue. I don’t know who well that would work on red oak, with its extremely porous endgrain. You may have to size it first. Worth testing out.

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

View builtinbkyn's profile

builtinbkyn

2633 posts in 1056 days


#2 posted 08-13-2018 06:11 PM

..... I was thinking of a scarf joint with maybe a 30 degree angle.

Anyone tried anything like this?

- RobS888


Use splines, loose tenons or half lap. Butt join them. Or you can even use pocket holes, but I think one of the first three would be better.

-- Bill, Yo!......in Brooklyn & Steel City :)

View bilyo's profile

bilyo

302 posts in 1219 days


#3 posted 08-14-2018 03:44 AM

With a well done glued scarf and matching grain to the extent possible, the joint will nearly disappear.

View Woodknack's profile

Woodknack

12329 posts in 2496 days


#4 posted 08-14-2018 06:06 AM



With a well done glued scarf and matching grain to the extent possible, the joint will nearly disappear.

- bilyo


+1

I’ve done scarf joints, in trim and on stringed instruments. They are very strong and as said above, if the grain is well matched are not very noticable.

-- Rick M, http://thewoodknack.blogspot.com/

View RobS888's profile

RobS888

2483 posts in 1961 days


#5 posted 08-14-2018 02:00 PM

Thanks guys, I definitely want to sand and finish this as one piece.

-- I always suspected many gun nuts were afraid of something, just never thought popcorn was on the list.

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