[Patrick]

Can anyone direct me to a really old thread where installing/dealing with crown on a radius was covered? Ie at the top of a staircase or in a gable on a cape.

 

[Robie]

This is the results of a search from April 2010.

http://www.contractortalk.com/search.php?searchid=6129496&pp=25

 

[griz]

maybe one of these?

http://www.contractortalk.com/f49/ceiling-wall-radius-help-49370/

http://www.contractortalk.com/f13/another-crown-angle-question-23807/

 

[Patrick]

Thanks guys !

 

[ubcguy89]

whats so difficult about putting crown on a radius? you just need relief cuts in the back. Dependin on how tight the radius is you may need to get the crown made from a shop.

 

[Leo G]

http://www.contractortalk.com/f13/bullnose-crown-slideshow-53530/

 

[Robie]

http://www.contractortalk.com/f13/bullnose-crown-slideshow-53530/

Yeah, that's the way I've always done it....:whistling

 

[Leo G]

I know, I watched you do it. :whistling

 

[Robie]

I know, I watched you do it. :whistling

You lie and I'll swear to it.....

 

[StrongTower]

whats so difficult about putting crown on a radius? you just need relief cuts in the back. Dependin on how tight the radius is you may need to get the crown made from a shop.

I've never had any luck with kerfing out crown for a radius. I believe your piece with fight you every inch of way.... Unless you're doing something I'm not.

 

[ubcguy89]

I've never had any luck with kerfing out crown for a radius. I believe your piece with fight you every inch of way.... Unless you're doing something I'm not.

IDK whay you are doing, I did walnut crown on an 80' dome 40' radius and had alot of luck just putting relief cuts in the back. It took some time to figure out the depth of the cut and how often to cut it. It turned out great. I broke the radius every 20' on center and ran the crown into plinth blocks,
dont get me wrong I broke a few pieces, and walnut is easy to break when trying to bend it with relief cuts in it, but eventually I figured it out

 

[B.Scott]

With most of the wood today, I'd have to straighten it some in order to fit in a forty foot radius.

 

[basswood]

Here is a slideshow of how I do it. This is for a very tight radius (bullnose corner), but the process for larger radii is similar:

http://s436.photobucket.com/user/knottree/slideshow/bullnose crown

 

[ubcguy89]

Here is a slideshow of how I do it. This is for a very tight radius (bullnose corner), but the process for larger radii is similar:

http://s436.photobucket.com/user/knottree/slideshow/bullnose crown

now lets just say we are talking stain grade, or prefinished trim. You better get to kerfing your trim, wet it, soak in water overnight, whatever.

 

[StrongTower]

Only way you're getting a stain grade piece of crown around a drywall bull nose is with a molded piece of crown or faux finishing what Bass does.

I personally think its cool wrap the crown like that, but it does take away the mitered profile that makes crown look great. I'd rather have the drywallers put a transition for a 90 degree corner.

 

[Leo G]

Bring the crown to a wood turner. Tell him the radius you need and have him turn you a quartered turning. It will need to be ban sawed for the inner radius. But that will get you a correct species round corner.

 

[ubcguy89]

Only way you're getting a stain grade piece of crown around a drywall bull nose is with a molded piece of crown or faux finishing what Bass does.

I personally think its cool wrap the crown like that, but it does take away the mitered profile that makes crown look great. I'd rather have the drywallers put a transition for a 90 degree corner.

I was thinking more on the lines of a radius wall with a large radius. We all know your not going to wrap a bullnose outside corner

 

[B.Scott]

What's all this talk about kerfing crown? I can't think of a situation where kerfing would allow it to bend except maybe that one story about the 80' dome.

If its a radius and stain grade with a matching wood species you have a millwork shop make the moulding to the radius.

For paint grade or faux finish look into something like a flex trim product. Again, specify the radius.

Nice plaster crown Bass.

 

[basswood]

Bring the crown to a wood turner. Tell him the radius you need and have him turn you a quartered turning. It will need to be ban sawed for the inner radius. But that will get you a correct species round corner.

Or you just turn 4 corners at once, like turning a finial. Then you can drill out the center to get the inside radius of all 4 corners at once.

Glue up the 4 quarters on paper and you can part the corners without sawing.

 

[basswood]

I was thinking more on the lines of a radius wall with a large radius. We all know your not going to wrap a bullnose outside corner

The technique is the same for larger radii, that is why I posted it.

Kerfing back of crown would only really work on HUGE radii, and even then it would want to be installed flat without a spring angle, which looks dumb, of course. Otherwise you are truly fighting the wood.

Forcing the bottom of the crown into a larger radius than the top puts the bottom in tension and the top in compression, not a good situation. From a physics standpoint, you would really need to kerf the front edge of the top of the crown, which would not look pretty.

Save kerfing for bending in the plane perpendicular to the kerf, and mostly with flat stock, rather than profiled.