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Scarf Joint On Long Crown Molding

 
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Old 04-29-2019, 07:00 PM   #1
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Scarf Joint On Long Crown Molding


I have a crown molding job i need to start tomorrow on short notice. It is 4 1/2 inch oak that i am going to clear coat with polyurethane. I have two runs of 26 feet. I am thinking of doing the scarf joint in my shop and sanding it out then finish with poly. Has anyone ever done a scarf joint of this length and then hauled it to the job? i figure i could put a 40 foot ladder on my racks and tie it down. I could defiantly get a nicer joint in my shop than on the job. I work alone but would probably have to have help getting into the job and held in place.

thanks......nicko
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Old 04-29-2019, 07:16 PM   #2
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Re: Scarf Joint On Long Crown Molding


Are you actually saying that you would connect, haul, and install one piece?
Is there an OCD hotline?

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Old 04-29-2019, 07:34 PM   #3
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Re: Scarf Joint On Long Crown Molding


Will it fit in the door and around the corner?


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Old 04-29-2019, 07:40 PM   #4
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Re: Scarf Joint On Long Crown Molding


If it will fit Id do it. It will look so much better that way.
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Old 04-29-2019, 07:56 PM   #5
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Re: Scarf Joint On Long Crown Molding


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Are you actually saying that you would connect, haul, and install one piece?
Is there an OCD hotline?
Thats funny! Yes i am little OCD.
I am going to go to the house in the morning and see if i can get it into the house and in the room i need it to be in. I think i can but i am going to check it out. It will be a nicer joint and ill save a lot of time on the job trying to get a nice joint.

thanks...nicko
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Old 04-29-2019, 08:24 PM   #6
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Re: Scarf Joint On Long Crown Molding


I have done it already, I used a pc of 5/4x3 Saran wrapped to the crown and cut it off after it was lifted onto supports just below its position
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Old 04-29-2019, 08:50 PM   #7
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Re: Scarf Joint On Long Crown Molding


If you don't want to ding it up or possibly crack it, you'll do it like tri. The only difference I do is using moving wrap instead of saran wrap.

Personally I'd prep the two pieces as a butt joint and assemble on site. I mostly use scarf joints in boatbuilding joining plywood, but it's more like a 1 in 12 angle.
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Old 04-29-2019, 11:47 PM   #8
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Re: Scarf Joint On Long Crown Molding


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Originally Posted by nickko View Post
Thats funny! Yes i am little OCD.

I am going to go to the house in the morning and see if i can get it into the house and in the room i need it to be in. I think i can but i am going to check it out. It will be a nicer joint and ill save a lot of time on the job trying to get a nice joint.



thanks...nicko






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Old 04-30-2019, 03:09 PM   #9
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Re: Scarf Joint On Long Crown Molding


I scarfed an 18' piece and it went together well. I glued a strip of 1/4" plywood to the back and stapled it with 3/4" narrow crow staples and then sanded it. It looked good but its hard to move around without the joint opening. As long as its laying flat it looks good. I didn't put a biscuit in it but i don't think it would have helped much. So i am going to just scarf the 26 footers on the wall. Its a dimly lit bedroom so that should help

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Old 04-30-2019, 06:24 PM   #10
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Re: Scarf Joint On Long Crown Molding


If its thick enough you could pocket screw it using a butt joint. With a scarf joint there would be no way to biscuit it really
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Old 04-30-2019, 07:03 PM   #11
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Re: Scarf Joint On Long Crown Molding


Depending on light, etc. I might break it up using two scarf joints, each far from the center.
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Old 04-30-2019, 10:08 PM   #12
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Re: Scarf Joint On Long Crown Molding


Quote:
Originally Posted by nickko View Post
I scarfed an 18' piece and it went together well. I glued a strip of 1/4" plywood to the back and stapled it with 3/4" narrow crow staples and then sanded it. It looked good but its hard to move around without the joint opening. As long as its laying flat it looks good. I didn't put a biscuit in it but i don't think it would have helped much. So i am going to just scarf the 26 footers on the wall. Its a dimly lit bedroom so that should help



nicko


I prefer to change out the light bulbs for dimmer on my finish work.


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Old 04-30-2019, 11:36 PM   #13
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Re: Scarf Joint On Long Crown Molding


I don't do scarf joints for something like that. A butt joint and a biscuit work better as long as it will fit. At 26 feet I'd glue and screw or staple a pc of 1/4" to the backside to help it with stiffness at the joint.

Now if you could do a true scarf joint that is 8-10" long then you'd have more than enough surface area for glue to not worry about it.
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Old 05-09-2019, 11:19 AM   #14
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Re: Scarf Joint On Long Crown Molding


I would do the scarf joint on site. Take your time, fit it properly and it will turn out well. Plus a lot less effort, frustration, worry, time, and no need to pay someone to help you.
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Old 05-09-2019, 11:22 AM   #15
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Re: Scarf Joint On Long Crown Molding


Not in prefinished.
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Old 05-09-2019, 11:24 AM   #16
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Re: Scarf Joint On Long Crown Molding


Why not? I’ve never had a problem with it. Sometimes it’s difficult, but definitely possible, especially if it’s stain-grade.
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Old 05-09-2019, 11:29 AM   #17
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Re: Scarf Joint On Long Crown Molding


Quote:
Originally Posted by nickko View Post
I have a crown molding job i need to start tomorrow on short notice. It is 4 1/2 inch oak that i am going to clear coat with polyurethane. I have two runs of 26 feet. I am thinking of doing the scarf joint in my shop and sanding it out then finish with poly. Has anyone ever done a scarf joint of this length and then hauled it to the job? i figure i could put a 40 foot ladder on my racks and tie it down. I could defiantly get a nicer joint in my shop than on the job. I work alone but would probably have to have help getting into the job and held in place.

thanks......nicko
How did it turn out? Pictures?
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Old 05-09-2019, 11:29 AM   #18
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Re: Scarf Joint On Long Crown Molding


When you walk away it might look beautiful. When the seasons change it's going to open up. If you make the pc in the shop and clamp it up so it becomes one, then it won't move.

You will get better results from stain grade than prefinished pigmented. And when the stain grade moves you can colorize it with markers or crayons to make it disappear. It's harder to do that with a pigmented cabinet finish, and I avoid it at all costs.

Can you do it and make it look OK, yep. Will it last, likely not, but possible if it's really put together well. Stain can be hidden after the fact and it's much tougher to hide pigmented after the fact.

If it's a brush on paint then go for it, easily hidden later on.

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