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Post subject:Chinese Roof Jack/ Round Cone Roof Track
 Posted: Jul 06, 2004 - 05:32 PM #1342
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Joined: Jul 02, 2004
Posts: 5
Location: El Paso, TX
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I’m taking the practical exam in New Mexico for the “Journeyman Sheet Metal” through Experior. Two of the fabrications to be made are;
1- Chinese Roof Jack
2-Round Cone Roof Track
Can any one explain what these are? I may know them through the trade lingo but not the exam name. |
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 06, 2004 - 05:38 PM #1343
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Webmaster
Joined: May 13, 2003
Posts: 1326
Location: Waukesha
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The first is more then likely the sane as the chinamans hat / cap I'll put up a drawing of it tonight. When is the exam?
Bud
I'm not sure on the other one, tell me more about it and I'll too get that drawing to you. |
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"If you make your job important it is quite likely to return the favor" Author Unknown
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 06, 2004 - 05:40 PM #1344
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Webmaster
Joined: May 13, 2003
Posts: 1326
Location: Waukesha
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Will you tell us more on the exam? what are they expecting, so we can be of better help?
bud |
_________________
"If you make your job important it is quite likely to return the favor" Author Unknown
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 06, 2004 - 05:53 PM #1345
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Joined: Jul 02, 2004
Posts: 5
Location: El Paso, TX
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The exam is July 21.
The shop project is two hours, construct one of three fittings (chosen by numbers), one sheet of metal provided.
Fittings are;
1-Sq. Round
2- Round Cone Roof Track
3-Flat roof Jack w/Chinese cap @ 30degree pitch
Drawings are;
1- Elbow
2- Based on scale |
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 06, 2004 - 06:27 PM #1347
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Webmaster
Joined: May 13, 2003
Posts: 1326
Location: Waukesha
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| I would take the Square to Round and the Flat roof Jack on 30 deg. (Correct me if I'm wrong, but the jack is on thirty degrees not the cap?) |
_________________
"If you make your job important it is quite likely to return the favor" Author Unknown
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 07, 2004 - 02:47 PM #1358
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Power User
Joined: Sep 03, 2003
Posts: 175
Location: edinburgh
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| Is a conical roof track a cone shaped skirt that fits round a flue [chimney ]as it exits through the roof ?.This is just a guess .aw ra best marky |
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 07, 2004 - 03:25 PM #1359
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Joined: Jul 02, 2004
Posts: 5
Location: El Paso, TX
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I see I’m not the only one here ‘thrown for a loop!’
Bud, I have the same idea that it was the roof pitch rather than the cap.
Marky, these exam companies need to be out in the field for awhile! I call that a vent pipe roof flashing, but not sure if that is what they mean.
I called to talk to the person who grades the exams at Experior and they refer me to Contractors Licensing Services, Inc., and then they refer me back to Experior. So now you know what I’m going through.
EPDUKES13 |
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 07, 2004 - 10:42 PM #1360
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Webmaster
Joined: May 13, 2003
Posts: 1326
Location: Waukesha
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I guess what we need to do is to get you to thoroughly understand triangulation and this will solve for any problem you come accross?
Click on printable practice problems on the "Shop Menu" and there are three different problems with square to round that will allow you to print and practice. I'll get the other ones together..what are your strong points in layout and what do you need help with? Knowing this we will be able to help you in a more timely fashion...
Bud |
_________________
"If you make your job important it is quite likely to return the favor" Author Unknown
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 13, 2004 - 05:09 AM #1397
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Joined: Jul 13, 2004
Posts: 1
Location: columbia missouri
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| it seems to me that a flat roof jack is a flat roof jack. the cone should be at a 30 degree angle to deflect the elements. |
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 16, 2004 - 12:17 AM #1401
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Joined: Mar 17, 2004
Posts: 16
Location: USA Ga
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Bud wrote:
I would take the Square to Round and the Flat roof Jack on 30 deg. (Correct me if I'm wrong, but the jack is on thirty degrees not the cap?)
It's been awhile since looking at the layout book for the chinese cap, but if memory serves right, one of the layout parts is that the cap slope should be 30 degrees angle to the pipe it is covering.
Could be wrong who knows? |
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 16, 2004 - 02:17 PM #1402
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Webmaster
Joined: May 13, 2003
Posts: 1326
Location: Waukesha
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| That makes sence to me as well, then we need to determine the cut out for the cap that when pulled together the cap becomes 30 degrees? |
_________________
"If you make your job important it is quite likely to return the favor" Author Unknown
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 16, 2004 - 02:55 PM #1403
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Power User
Joined: Sep 03, 2003
Posts: 175
Location: edinburgh
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What we really need here is a drawing ,because different countrys and even areas have different names for the same thing,what i call a chinamans hat was called a cooly hat when i worked down in england,so different areas different names ,who knows this exam board may have thrown us all a curved ball [in cricket thats a googlie .]and we all have the wrong answer or not . aw ra best Marky  |
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 16, 2004 - 03:13 PM #1404
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Webmaster
Joined: May 13, 2003
Posts: 1326
Location: Waukesha
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| How to develop the conical section of the cap can be very easy at any angle. Draw the elevation of the cap at the desired angle shown as 1 to 2 to x being the apex [Dark Shaded Area]. The circumference of the cap would be the length of A to B as shown in red. The radius of the cap will be X to 1. The red section would be the actual cap. It does not allow for seams and edges. The rest of the chimney can ce developed as parallel line? The stretchout for the pipe is the circumference plus the seam. |
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3345 Time(s) |
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 16, 2004 - 03:40 PM #1405
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Webmaster
Joined: May 13, 2003
Posts: 1326
Location: Waukesha
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Here is a link to more stuff that I had on and through site changes forgot to put back the link, it has a link to the Emerson ventilator
http://www.thesheetmetalshop.com/pn/ind ... ay&pid=121 |
_________________
"If you make your job important it is quite likely to return the favor" Author Unknown
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Post subject:An old Neubecker article I found
Posted: Jul 17, 2004 - 03:04 PM #1407
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Webmaster
Joined: May 13, 2003
Posts: 1326
Location: Waukesha
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| On Flaring Tops and caps, etc. |
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Download |
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Pattern_For_Flaring_Hood.pdf |
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16.9 KB |
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160 Time(s) |
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Post subject:an easy way....
Posted: Jul 18, 2004 - 12:30 AM #1409
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Power User
Joined: Sep 16, 2003
Posts: 213
Location: McEwen, TN.
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Bud wrote:
How to develop the conical section of the cap can be very easy at any angle. Draw the elevation of the cap at the desired angle shown as 1 to 2 to x being the apex [Dark Shaded Area]. The circumference of the cap would be the length of A to B as shown in red. The radius of the cap will be X to 1. The red section would be the actual cap. It does not allow for seams and edges. The rest of the chimney can ce developed as parallel line? The stretchout for the pipe is the circumference plus the seam.
BUD...divide the base (1 to 2) by 7...set your dividers with that dimension...step off 22 times your circumferance line (a to b)..that will give you the circumference of your china mans cap...[/quote] |
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 18, 2004 - 02:15 PM #1415
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Power User
Joined: Apr 17, 2004
Posts: 260
Location: Central Ohio
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| Ah yes, the old 22/7ths trick. So, 22/7=3.1428=pi Verrry interesting.... |
_________________
Steve
Blissfully Ignorant Copperhead
www.copperthings.com
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 18, 2004 - 02:42 PM #1416
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Webmaster
Joined: May 13, 2003
Posts: 1326
Location: Waukesha
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| I'm learning something new all the time. This is a constant learning (or relearning) experience, thats why I hang out here, this is what it's all about! Thank you for the knowledge you take time share:) Tips like this will help thousands. Priceless! |
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 20, 2004 - 03:44 AM #1448
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Power User
Joined: Sep 16, 2003
Posts: 213
Location: McEwen, TN.
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chinaman cap/flat roof jack
bordontn |
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3270 Time(s) |
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Post subject:RE: Chinese Roof Jack/ Round Cone Roof Track
Posted: Jul 22, 2004 - 11:23 PM #1460
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Joined: Jul 02, 2004
Posts: 5
Location: El Paso, TX
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 I PASSED!
A thanks for everyone’s input. I ended up fabricating the ‘square to round’ fitting. I practiced every one of the ideas posted from you techs.
The ‘Round Cone Roof Track’ is the roof flashing for a vent pipe/stack.
The ‘Flat Roof Jack w/ Chinese Cap’, the cap is at a 30 degree pitch not the RJ.
You know I posted these same questions the web site ‘HVAC Talk’ w/ only two replies.
Thanks One More Time,
Bernie L. Gonzalez
Principal HVAC Technician
El Paso Electric Co. |
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