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johnsuchow 10-17-2006 09:45 AM

rafters
 
how to measure,cut, and install rafters and do the birdsmouth on a gable roof?????

Joe Carola 10-17-2006 04:52 PM

Quote:

Originally Posted by johnsuchow (Post 21058)
how to measure,cut, and install rafters and do the birdsmouth on a gable roof?????

John,

This is what I posted to you in the other thread you started.

1) What is the width of the building?

2) What size rafters?

3) What size Ridge?

4) What size is the overhang?

5) What is the pitch?

6) What is the wall thickness, 2x4 or 2x6?

Are you using a framing square, speedsquare ,calculator, rafter table book to figure your rafter length?

joasis 10-17-2006 08:33 PM

I hate to say it, but a self help book from Lowes or HD can give some basic information on how to do it in easy to follow steps....

IHI 10-22-2006 07:13 PM

Not to sounds too crudimentry;) but a real simple way would be to mock up a piece of wood in the locatiuon the ridge beam will be so it is flush with the outside wall. Take your rafter lumber and with a helper hold it upto the outside edge of the ridge beam (where the rake overhang would be) and have your helper hold it against the outside wall by the top late making sure you get a full heal on the top plate.

Then it's just a matter of tracing the angles with a pencil onto the rafter board and cutting it out-simple as that and is faster than doing math to figure it out, unless you do this sort of thing enough to be profiecent at it. KISS method in full effect:)

Joe Carola 10-22-2006 09:30 PM

Quote:

Originally Posted by IHI (Post 21530)

Then it's just a matter of tracing the angles with a pencil onto the rafter board and cutting it out-simple as that and is faster than doing math to figure it out, unless you do this sort of thing enough to be profiecent at it. KISS method in full effect:)

Sorry, but that has got to be the furthest thing from the truth.

You're given a pitch on the plans. How is this guy going to know where and how high to even set the ridge?

Even if he did, which he won't because he would have to know math to set the ridge at the exact height and allow for the thickness of the rafter birdsmouth and HAP cut. By the time he tries to figure it out and then get the ridge up there and braced level and perfectly in the center, you could have the whole roof cut already.

The rafter length can be figured out in 4 seconds with a calculator or maybe 1-2 minutes if you stepped it off with a framing square.

You cut four rafters and nail them in place at each end of the house and then lift the ridge up and slide it in between the four rafters. They hold up the ridge and that's it. I've never seen anyone set the ridge first and there's no need to except for certain structural ridges.

IHI 10-22-2006 10:13 PM

Joe, I know what your getting at, but this is a DIY site so laying out/marking rafters based of a formula is no different than telling the average joe, "building stairs is easy, just do some simple math and lay it out with a framing square". There are probably a select few guys that could handle it after scerwing a few up and having the light bulb turn on, but for the average DIY guy what your getting at is typically like speaking greek. This is all you do so like most of us in the trades certain things turn into a no brainer and we cant understand why nobody understands what we're trying to tell them on how to do it-would be like you asking how do I build a rocket on a rocket building forum. You probably know very little about it so most of the things they tell you to do, your going to be scratching your head thinking...ahhh, sure.

As for setting the ridge beam, everytime I/we do an addition that requires hand framing I always set the ridge first from the house to the end of the rake on the new addition for a gable or inset for a hip roof. I was just giving a very basic, hard to screw it up way of marking it out since he obviously has an idea of what he wants for roof pitch so heigth is already figured out, just a matter of getting the rafter cut and birdsmouth to line up-then it's all gravey. For an average joe I promise by the time they figure hoiw to make sense of a math formula, apply it, figure out how they're going to lay it out, more than likely screw that inital piece up; they will easily be on their way marking the remaining rafters with my easy layout method.

Joe Carola 10-22-2006 10:27 PM

Quote:

Originally Posted by IHI (Post 21548)
Joe, I know what your getting at, but this is a DIY site so laying out/marking rafters based of a formula is no different than telling the average joe, "building stairs is easy, just do some simple math and lay it out with a framing square". There are probably a select few guys that could handle it after scerwing a few up and having the light bulb turn on, but for the average DIY guy what your getting at is typically like speaking greek. This is all you do so like most of us in the trades certain things turn into a no brainer and we cant understand why nobody understands what we're trying to tell them on how to do it-would be like you asking how do I build a rocket on a rocket building forum. You probably know very little about it so most of the things they tell you to do, your going to be scratching your head thinking...ahhh, sure.

As for setting the ridge beam, everytime I/we do an addition that requires hand framing I always set the ridge first from the house to the end of the rake on the new addition for a gable or inset for a hip roof. I was just giving a very basic, hard to screw it up way of marking it out since he obviously has an idea of what he wants for roof pitch so heigth is already figured out, just a matter of getting the rafter cut and birdsmouth to line up-then it's all gravey. For an average joe I promise by the time they figure hoiw to make sense of a math formula, apply it, figure out how they're going to lay it out, more than likely screw that inital piece up; they will easily be on their way marking the remaining rafters with my easy layout method.

If you have a fixed ridge height then yes you can set the ridge height first alevel and center and then scribe. That would be fast for a diy'er.

I'm talking new framing here. If a diy'er wants to cut rafters, then he should find out how to lay one out because it would be a hell of a lot faster and safer to just set the four rafters in place.

They want to take on a framing job and frame a roof, that's no ltlle task for a diy're or anyone else. So they have to learn something to make it easier for them. To cut a new roof, learning how to lay out the rafter length is one of them.

IHI 10-22-2006 10:50 PM

Quote:

Originally Posted by Joe Carola (Post 21549)
They want to take on a framing job and frame a roof, that's no ltlle task for a diy're or anyone else. So they have to learn something to make it easier for them. To cut a new roof, learning how to lay out the rafter length is one of them.

I agree, but since I deal almost exclusively with old construction and DIY good intention repairs/redo's nothing will stop a DIY from attempting anything LOL!! even if it's wrong:eek:

Blocklayer 10-25-2006 01:34 AM

Is this online roof framing calculator of any use to you?

http://www.blocklayer.com/roof/gableeng.aspx


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