I AM IN SEARCH OF A OLD FRAMING BOOK
THIS BOOK WAS IN PAPERBACK FORM AND HAD EVERYTHING
IN THE INDEX OF THE BOOK WERE EQUATIONS FOR HOW TO CUT THE ECLIPSE FOR DIFFERENT SIZE PIPE PENETRATIONS THOUGHT ROOF SHEATHING, THE OTHER EQUATION IT OFFERED WAS FOR FINDING THE BEVEL AND ANGLE FOR FASCIA. I AM INTERESTED IN THE CUTTING FASCIA FOR SQUARE CUT 6″ PITCH RAFTER TAILS WHERE THEY COME TOGETHER ON 45 AND 90 DEGREE HIPS
THANKS PETE ERNST
Replies
Try This...
http://www.josephfusco.org/article_donations_page.html
not sure if its what your looking for or not...
paul
Development of Flashing intersectsion with Main Roof
This page doesn't show the ellipse dimensions. The Minor Axis remains the same as the diameter of the circle, the Major Axis = Diameter/cos Pitch Angle, where the value of the Pitch Angle = arctan (rise/run).
The development is drawn as follows: The circle was divided into equal angles; hence equal arc lengths. Beginning on the left (this point is the highest point on the slope of the roof), mark each arc length on the horizontal. The vertical dimension is found by multiplying the arc length × rise/run. The resulting curve is a sinusoid.
Only half of the sinusoid is shown in the image; the development is flipped to create a mirror image about the vertical axis. To make the elliptic ring another curve is traced above the first one (3" in the example). If a lap is required the curves may be extended.
Square Tail Fascia intersects Hip Rafter Calculator
There are links to diagrams, models and the theory or geometry behing the calculator.
Hope this helps. :)
Joe Bartok
Edited 12/11/2006 10:18 am ET by JoeBartok
I don't know anything about which books might be the best, but here are a couple of links to my twisted view of "Advanced Roof Framing":
Timber Roof Framing and Joinery Math
Online Math Notes and Sketches Joe Bartok
I don't recall that one but have you seen:
A Roof Cutters Secrets by Will Holaday (sp?)
One of the best framing books I've read..more than roofs but the bulf of it deals with pretty much all I've ever needed and much more .
HTH
10saw
Typing in all capital letters is sorta like shouting, and is considered to be rude.
A: He was disbarred.
from a previous thread:
Here's a way to use a scrap of 4x4 to make a model of all the angles in a hip roof with a square-cut fascia. Angle a is the roof angle (i.e. 7:12), line 2 is drawn from the corner perpendicular to line 1. Line 3 is then marked at a length equal to line 2. From the end of line 3, lines 4 and 5 can be drawn.
http://forums.taunton.com/n/mb/at.asp?webtag=tp-breaktime&guid=220717D9-6204-48C2-94D6-A10189A32C2F&frames=no
The second pic shows how the model relates to the actual hip roof.
http://forums.taunton.com/n/docs/docDownload.aspx?guid=DD0C208F-DE1D-4A55-B8EC-A54131673207&webtag=tp-breaktime
"Down these mean streets a man must go who is not himself mean, who is neither tarnished nor afraid...He must be, to use a rather weathered phrase, a man of honor, by instinct, by inevitability, without thought of it, and certainly without saying it." - Raymond Chandler
Edited 12/12/2006 10:04 am ET by Gumshoe
This doesn't answer your specific questions but there are links to what certainly qualifies as "Advanded Roof Framing":
Timber Framers Guild
Joe Bartok
Edited 12/13/2006 11:07 am ET by JoeBartok
Might try locating a copy of "The Roof Framers Bible" by Barry D.Mussell
It has a page on ellipse layouts and may have the formulas you are looking for.