Carpentry & Home Improvement Skills : How to Build Rafters

[HammerFist1970]

Thank you!

[kmendiola59]

Man that was a great illustration simple and precise.

[EfrenChavez205]

Here's an easy way to find the length of your rafter. Overhang + run x factor(hypotenuse) - half the ridge board and that will = the distance of your rafter. Ps make sure you square root your factor before you multiply it. Thumps up if this was helpfull to you!

[homeostasis4me]

Oh. Instructional.  Thanks.....meh....

[thompsontricia39]

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[brotherjesus]

I am building a ramp for my shed, sounds simple. My run is 48 inches my rise will be 10.5 inches, what is my pitch? This is where it gets difficult instead of the rafter (which is actually my ramp stringer) resting on the top of a wall it will be resting on top of a concrete footing, so the bottom must be cut so it will lay flat, while the stringer rests square against the side of the shed (which could be considered the ridge), then I need to cut a birds mouth to rest on angle iron shed side.

[FueledByTyeler]

@brotherjesus in standar notation your pitch is 2.513, 12

[kevinflynn1980]

use pythagoras theorm. your run is 6 foot, whats your rise? 6squared + your rise squared= you true lenght squared. sample 6x6 +4x4=T.Lsquared so root 60=T.L

so 7.7 is your true lenght of your common.

[bryans710]

Every freakin video Ive found doesnt tell you how to get the length of the rafter. I used to do it 10,yrs ago but Ive forgoten. I was taught to cut the seat cut and put the tape into the corner of the cut and measure across the board to the peak. If the building width is 12'. Half is 6' but the rafter would be a little longer. whats the math?

[FueledByTyeler]

@bryans710 if your building is 12' wide and the ridge is in the middle then your 'run' is half that, it's 6'. if your pitch is 8/12 like this guy says, then for every 12 inches of run you have 8 inches of rise. since 6 feet is 6 sets of 12 inches you'll have six sets of 8 inches meaning your 'rise' will be 48 inches. since this forms a right triangle (rafter being the hypotenuse) you can do rise squared times run squared equals rafter squared. in this case (48^2)(72^2)=(x^2) x=the rafter length

[canubelieve]

What if you don't know the length of the rafter, which is the case nearly all the time? Usually you just know the width of the building.

[73Mackem]

why not join the rest of the world and get metric...feet n inches died years ago...as for that tuition, crap......i doubt u could level water...

[dexsmasher]

to get the pitch of a roof can you measure up thee rafter 12 inchs put a level across the mark and when its level you measure the gap.? say its 7 inchs from the bottom of the level to the mark on the rafter and that would be a 7/12 roof? is that the right way to do it?

[DRNEFDR]

wow all the sudden everyone becomes an expert huh just use a construction calculator if your to cheap to buy one then use the Hypotenuse formula and if didnt understand anything get someone who knows personally I dont like to use a framing square because its not exact on longer rafter remember each pencil line is almost 1/16" thick

[wildwill1970]

@DRNEFDR Also on most framing squares it has the multiplier right next to the inches. You just times the lenght of the run by that number and don't forget to subtract half the diameter of the ridge. Bingo, rafter length.

[andybarnes20]

the bird mouth is alway a 3rd of the timber what ever and it alway the plumb cut is 90 % of your seat cut

[andybarnes20]

quick sqaure and recker lol

[8reste]

Thank you for common sense, Other video's were a bit confusing, Once again...Thanks

[beanbag84]

the pitch is 1/3rd not 8/12, the SLOPE is 8/12, he is usiong the wrong term, and the birdsmouth should be 1/3rd of the material, it dsnt mater what the plate is made of,

[embitteredshurpa]

This is the most ridulous way to lay out a rafter. You walk the rafter length out with the square and not measure from the ridge because the ridge height hasn't been established yet. NEVER use square nuts because they come loose and you won't realize it till after it is too late.Your birds mouth has depth cut requirements you just don't measure 3.5" for the wall plate your birds mouth is required to overlap your exterior sheathing.Hire a professional framer unless your building a chicken coop