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how to enclose with curved angle

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Forum topic by scotty2394 posted 01-29-2011 01:08 PM 824 views 0 times favorited 8 replies Add to Favorites Watch
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scotty2394

3 posts in 1428 days


01-29-2011 01:08 PM

Any suggestions on how to enclose this duct work over my hood? I want it to look like a chimney that curves from the top to the base. It will bend 1/4” sheet rock over whatever framing I end up with and then mud it to look like plaster. I plan on using plywood “ribs” that are cut in the curved shape from the hood to the top of the duct. Sides and front aren’t a problem, I am stumped on the corners. They will need to be at a diagonal angle in order to meet the front and side ribs at the top corners. I will start at the top, bring it down straight for 20 inches or so and then have it gradually curve out to the outside edges of the hood. Hope this isn’t too confusing.


8 replies so far

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fredf

495 posts in 2453 days


#1 posted 01-30-2011 12:40 AM

hmmm maybe a sketch of what you have in mind? I cant quite picture it a rectangular chimney that curves out as it goes down?

-- Fred, Springfield, Ma

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TopamaxSurvivor

15058 posts in 2419 days


#2 posted 01-30-2011 12:59 AM

I would cut the ribs, use some very thin lathes to frame the verticle and lay the 1/4 sheet rock over it.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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scotty2394

3 posts in 1428 days


#3 posted 01-30-2011 03:40 AM

Thanks for the replies…......vertical ribs with horizontal lathe style sounds like it will work. This is the pic of what I am trying to accomplish. I need mine to be straight at the top in order to stay between the windows.

Topamax….....Will 1/4’’ sheet rock bend easily without breaking or will I need to kerf it on the back side?

View Gofor's profile

Gofor

470 posts in 2531 days


#4 posted 01-30-2011 03:45 AM

Make a mock up out of card board. When doing so, the first two pieces of the mock up would be straight square pieces of cardboard set in from the front corners diagonally to the pipe. On these, sketch out your curve, and then smooth out your hand lines using a flexible rule, etc to get a good continous flowing curve. This will give you a template for corner plywood ribs to which you can attach cross braces to support the sheet rock.

Two ways to do the cross braces:

Most difficult, with the ply corner ribs in place, pick up the compound angles for each cut (which will be different for each and every cross brace). trim back to length maintaining the angle.

Easiest: make two more ply supports for each rib. These will set back towards the pipe the thickness of your cross slats and will be affixed to each side, giving you a “rabbet” of sorts to nail the cross braces in to. (they only need to be an inch or so wide). Then you can lay the cross brace in position and get the angle cut you need. Won’t fit exact, and won’t be pretty, but will be strong enough when toe nailed or screwed to support the outside cover.

You may want to use 1/4” ply or something more flexible than sheet rock to lay up the curves on which you plan to plaster. In my experience, that is too much curve for sheet rock. With 1/4 ply you won’t need but a couple cross braces, and a nailer at top and bottom. Seal the ply or latex paint it before applying the faux plaster mud.

Just one way

Go

PS. I like your idea. I think it will be an attractive addition.

-- Go http://ncwoodworker.net/pp/showgallery.php?cat=500&ppuser=730

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GrandpaE

14 posts in 1634 days


#5 posted 01-30-2011 05:04 AM

Sheetrock can be moistened to assist with bending in a fairly tight radius. You might look on some of the remodeling sites for more info.

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TJK

14 posts in 1763 days


#6 posted 01-30-2011 05:30 AM

A drywall supplier (not a big box) will have bending rock. It’s 1/4” drywall that is more flexible than normal 1/4”. Should easily conform to the radius you need.

-- Tim - He who knows best knows how little he knows.

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TopamaxSurvivor

15058 posts in 2419 days


#7 posted 01-30-2011 05:47 AM

Whew!! I got out of that one easy ;-))

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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Gofor

470 posts in 2531 days


#8 posted 01-30-2011 06:04 AM

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