Need help on building a roof for a bird house. That’s right a bird house.
The shape of house is a decagon ( 10 sided ). It is 11″ high and the outside diameter is 12″. the side are made of 3/4″ stock.
I want to have a single peaked roof that is in proportion to the size of the house. I am thinking that the roof peak should be about 6″ above the top of the house. It will have a 1″ overhang. I am not sure if there is a ratio of house size to roof size.
I need to know how to figures the size of each section and what angle to cut the sides to so they the mesh with other as the sections go around the roof. I will then shingle the roof with some king of made up wood siding.
I have been messing with Skectch Up but my lack of skills make it difficult to make a model and take measurements from it.
A little project but a lot of thinking to get the roof correct.
Can anyone help? Thank You
Replies
My initial reaction was "beats the shit outta me".
I'm no framer, tho I do frame and have struggled through hips, valleys and some other odd shaped multidimentional shapes....................and I'm definitely not in tune with trig.
The late Joe Fusco probably has the calcs on his site if it's still up.
With a pc of paper and a dull pencil and the memory of a crown job a few months ago...................
The flat angle of those ten sides is 36 deg. and (what you'd mitrecut each pc is 18 deg.) which you probably figured out.
If I'm wrong with the above, don't bother reading the rest.
If it was crown and you could cut it in your mitrebox standing up at the angle it would go on the wall (upside down and backwards), you'd set the angle to 18 degrees. Doing it this way, you don't need to know the spring angle.
But, it would take a pretty good sized mitresaw to cut anything that stands 6" high (maybe a 12").
So, to do it on the flat, you'd need to consult a table of mitre/bevel cuts (according to the spring angle). Delta used to have one online, Dewalt too maybe.
or
You could use the Bosch digital angle finder. Punch in the spring angle, next set the 36 deg. side-push the button-bevel setting, push it again-mitre setting.
I've done this watching the news and answering the phone-I might be real off with this. If I were doing it I'd get some wood and head for the saw. I think I'd use plywood-no grain problems and you can cut it easily.
Best of luck.
When you figure this out, come back with some pictures for those of us who think we're carpenters.
thanks.
Simply plug your dimensions into the appropriate trig formulas on your calculator or spreadsheet.
Dont know trig or geometry?
a. take a class or get an on-line or library book and learn - you will use it the rest of your life.
b. Bondo and putty knife.
Don't hold me in suspense.
I'm anxious to know what I don't know.
thanks.