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Small Cabin Forum / Cabin Construction / Flush trimming rough openings
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WILL1E
Moderator
# Posted: 21 Oct 2021 08:09
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What's your best method for this?

Do you just mark the corners, snap a line and circular saw it?
Freehand it with a sawzall riding along the stud?
Get it close with the above and then hand router with a bit that works well on plywood?

Nate R
Member
# Posted: 21 Oct 2021 08:20 - Edited by: Nate R
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I've done this different ways. After using a sawzall years ago, I wanted something different. I tried a panel bit on a router on my garage last year. Eh, it was so-so....kinda burny on OSB.

Then found a framing guy on Instagram that uses a spiral panel bit, and that's what I used on my cabin. Expensive but WORTH it. Just drill a hole in the RO somewhere, and go to town with the router.

https://www.amazon.com/gp/product/B000HPYOJ6/

WILL1E
Moderator
# Posted: 21 Oct 2021 10:35
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Bought it! I've got enough windows to do to justify it!

Brettny
Member
# Posted: 21 Oct 2021 11:15
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Typicaly I use a sawsall from the inside. If it's done from the outside with a circular saw blade it does come out a bit better. This way you can also over cut a bit into the stud, setting the blade depth is important.

Nate R
Member
# Posted: 21 Oct 2021 11:45
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You won't regret the router bit. I find it MUCH easier and faster than a sawzall or circ saw for this.

travellerw
Member
# Posted: 21 Oct 2021 11:58
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I just used a long sawsall blade and did the cutting from the inside. Didn't even bother drilling a hole, just used and extreme angle to start the blade. Worked like a charm and was super quick. 1 $12 blade did all my openings (8 windows and a door). Was done in like 20 min!

ICC
Member
# Posted: 21 Oct 2021 12:06
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Router bit. Nicest cut edge, accurate, easy.... All the same reasons drywall guys use routers to cut holes for electrical boxes, etc. I know the appearance does not matter with the rough carpentry but it makes me happier with my work.

WILL1E
Moderator
# Posted: 25 Oct 2021 08:11
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Nate R that router bit was the bomb!! That bit in my Porter Cable router around 15k RPM made that 1/2" plywood feel like butta'!! Thanks for another great recommendation!

Nate R
Member
# Posted: 25 Oct 2021 11:38
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No problem! After trying it, I was a convert

toyota_mdt_tech
Member
# Posted: 27 Oct 2021 20:35
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Quoting: WILL1E
What's your best method for this?



Rotozip with a flush trim bit (used for sheetrock)

Or get close then use a router with a flush trim bit. That is what I used.

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