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how to calculate seat cut/plumb cut angles for a shed dormer??

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Discussion starter · #41 ·
shanewreckd said:
Say you had a rise of 300mm for the dormer, and it had a run from ridge to plate (level with the plate line) of 600mm. Your formula would look like: 300/600 = X/250... Which you would cross multiply. Ends up looking like X=(300x250)/600. So your plumb cut would be marked on X, or 125 in this case.

Anyway, hopefully that didn't come out too confusing, that's just how I was taught. Knowing how a framing square works is always useful.
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HI again Shane,
thank you very much for the example,just a question,do you measure the run from the center of the ridge to the outside of the plate?maybe is a stupid question..but is worth ask!do you work both with metric and imperial system?have you ever seen a metric framing square in canada?i found only a metric speed square,but learn how to use a framing square would be,like you and many other suggested,very helpful!thanks for the reply!
 
#42 ·
Snickare85 said:
HI again Shane,
thank you very much for the example,just a question,do you measure the run from the center of the ridge to the outside of the plate?maybe is a stupid question..but is worth ask!do you work both with metric and imperial system?have you ever seen a metric framing square in canada?i found only a metric speed square,but learn how to use a framing square would be,like you and many other suggested,very helpful!thanks for the reply!
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Since you are building in place, I would just go from outside of plate to face of ridge. That way there is no extra shortenings involved, just a straight measurement. In Canada we use both systems, since we export dimensional lumber to the states, it all comes in imperial. I mainly work in metric, as most commercial work has switched over to it. I have a metric framing square yes, in fact an old foreman of mine apprenticed with the guy who invented them (supposedly).
 
#43 ·
shanewreckd said:
Say you had a rise of 300mm for the dormer, and it had a run from ridge to plate (level with the plate line) of 600mm. Your formula would look like: 300/600 = X/250... Which you would cross multiply. Ends up looking like X=(300x250)/600. So your plumb cut would be marked on X, or 125 in this case.

Anyway, hopefully that didn't come out too confusing, that's just how I was taught. Knowing how a framing square works is always useful.
Click to expand...
I'll admit, math isn't my strong suit, but you confused the heck outta me. lol
 
#44 ·
jb4211 said:
I'll admit, math isn't my strong suit, but you confused the heck outta me. lol
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Haha sorry Jon, I have a bit of a math brain. That's how I was taught during my school portion of my apprenticeship. Actual rise times framing square run, then divided by actual run gives you the framing square rise. On a small enough scale, that shouldn't matter as you could fit it on a square anyway. But proportioning it down let's you fit those same dimensions on the blades of the square without changing the angle.
 
Discussion starter · #45 ·
thanks Shane for the detailed explanation,just one more question,what´s the brand of your metric framing square?i found a Chapell metric framing square but is extremely expensive,do you know where i can find one?thanks!
 
#46 ·
Snickare85 said:
thanks Shane for the detailed explanation,just one more question,what´s the brand of your metric framing square?i found a Chapell metric framing square but is extremely expensive,do you know where i can find one?thanks!
Click to expand...
Mine is just a run of the mill Stanley. It was cheap and available at the time. When it needs replacing I'll be buying a Frederickson metric framing square.
 
Discussion starter · #47 ·
shanewreckd said:
Mine is just a run of the mill Stanley. It was cheap and available at the time. When it needs replacing I'll be buying a Frederickson metric framing square.
Click to expand...
hi again Shane,
i searched online for this Frederickson framing square but i can´t find any seller,do you have any idea where i can get one from?thanks for the help!by the way this Frederickson comes also with a booklet in metric with different roof tables..very useful..
 
Discussion starter · #48 ·
Just for talking guys i´m dividing myself between this mirror that i finished today,some furniture details work and the playhouse..if there is someone from Canada or US anyway,that knows where i could find the Fredrickson metric square,that Shane as mentioned,please let me know,it would be a nice thing to have for me..unfortunately i can´t find anyone online that seems to sell this metric framing square..
 

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