Welcome to the The Garage Journal Board forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   The Garage Journal Board > The Garage > General Garage Discussion

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Search this Thread Display Modes
Old 06-30-2009, 10:48 PM   #1
nate379
Banned
 
Join Date: Feb 2009
Location: Palmer, AK
Posts: 7,298
Default Any reason to not make my own rafters?

I am starting to build a shed, looks like it will be 16x18 and I was thinking of building my own rafters. My Dad did this in 1990-91 when he built his 1st shop with a gambrel roof and no problems.

I need 8 for 24" oc and it would be about $25 in materials per, so under $200 for everything

Last edited by nate379; 06-30-2009 at 10:51 PM.
nate379 is offline   Reply With Quote
Old 06-30-2009, 10:53 PM   #2
tcianci
Senior Member
 
tcianci's Avatar
 
Join Date: Feb 2009
Location: Walpole, Ma
Posts: 3,015
Send a message via AIM to tcianci
Default Re: Any reason to not make my own rafters?

Nate, what is the pitch of the roof? 24 OC is a little light for anything but a steep pitch with minimum 5/8 sheathing
__________________
People are doing either what they THINK is right or what they KNOW is wrong.
tcianci is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 06-30-2009, 10:56 PM   #3
GSSFC
Senior Member
 
Join Date: Apr 2008
Location: Wolfeboro, NH
Posts: 423
Default Re: Any reason to not make my own rafters?

How do you buy pre-made rafters? Never heard of that?

Also, I see you are in Alaska. I would recommend 16" of even 12" on center if you experience high snow load. I would NOT do 24" unless you plan to remove the snow immediately, and even then...

If you run the eaves along the 18' length you need 14 sets of rafters for 16" oc.



Tim

Last edited by GSSFC; 06-30-2009 at 10:59 PM.
GSSFC is offline   Reply With Quote
Old 06-30-2009, 11:44 PM   #4
nate379
Banned
 
Join Date: Feb 2009
Location: Palmer, AK
Posts: 7,298
Default Re: Any reason to not make my own rafters?

My house is 24" on center for the rafters, so figured that is setup right, the shed would be fine.

Not sure on the pitch. It will be the same as the house and I haven't measured that yet.

My Dad built another garage in Maine last summer and he did premade trusses (didn't have time to make his own) and they are 24" OC. They get lots of snow... (17ft last winter).

We don't get much snow that builds up on the roofs it seems. I have never shoveled a roof living here, but in Maine I would do them 3-4 a year depending on teh winter.

Was going to use 3/4" sheathing. That is the normal.
nate379 is offline   Reply With Quote
Old 07-01-2009, 01:07 AM   #5
tcianci
Senior Member
 
tcianci's Avatar
 
Join Date: Feb 2009
Location: Walpole, Ma
Posts: 3,015
Send a message via AIM to tcianci
Default Re: Any reason to not make my own rafters?

I guess it varies by region, The 3/4 inch sheathing is a big plus if you are going to frame on 24 inch centers. The only place I see 24 OC around here is on cheap sheds from HD and such .The norm in these parts is 16 OC with 5/8 sheathing. I have seen trusses on 24 inch centers with purlins running 90 degrees to the truss and the sheathing applied to them. Trusses are stronger than rafters as far a weight bearing but you dont want to have sheathing developing sags between them. I guess if you have that type of construction already in your house and it is allowed and you do not see sagging telegraphing through you roof shingles, go with it
__________________
People are doing either what they THINK is right or what they KNOW is wrong.

Last edited by tcianci; 07-01-2009 at 01:10 AM.
tcianci is offline   Reply With Quote
Old 07-01-2009, 01:16 AM   #6
nate379
Banned
 
Join Date: Feb 2009
Location: Palmer, AK
Posts: 7,298
Default Re: Any reason to not make my own rafters?

What is the difference between a truss and rafter? I thought they were the same?
nate379 is offline   Reply With Quote
Old 07-01-2009, 01:48 AM   #7
mulepackin
Senior Member
 
mulepackin's Avatar
 
Join Date: Dec 2006
Location: Montana
Posts: 909
Default Re: Any reason to not make my own rafters?

A truss is what you are thinking of building. It is an engineered, prefabricated structural element that incorporates the the "rafter", the ceiling joist, and any bracing that is deemed necassary for the particular application. A rafter is a framed in place element that runs at the angle of the pitch of the roof. Rafters are nailed to a ridge board, and then the top plate of the wall.
http://www.homeadditionplus.com/fram...of-Rafters.htm

This shed plan from Popular Mechanix uses a site built truss.http://www.popularmechanics.com/home...t/1276536.html I used this plan as the basis for my shed, and altered it to suit my needs.
Attached Images
File Type: jpg 100_2331.jpg (53.2 KB, 20 views)
File Type: jpg 100_2330.jpg (56.4 KB, 16 views)
__________________
There's nothing heat and pressure can't overcome.
mulepackin is offline   Reply With Quote
Old 07-01-2009, 01:48 AM   #8
Justanoldguy
Senior Member
 
Justanoldguy's Avatar
 
Join Date: Jun 2008
Location: Mangakino New Zealand
Posts: 2,804
Default Re: Any reason to not make my own rafters?

In my experience.
A truss is a triangulated series of timbers creating a roof shaped structure.
A Rafter is a single length of timber varying in size depending on spacing and span.
Justanoldguy is offline   Reply With Quote
Old 07-01-2009, 01:57 AM   #9
Justanoldguy
Senior Member
 
Justanoldguy's Avatar
 
Join Date: Jun 2008
Location: Mangakino New Zealand
Posts: 2,804
Default Re: Any reason to not make my own rafters?

This is pretty normal in New Zealand.
Trusses at 1200mm (4ft) centres.
Black building paper over that.
Then galvanized corrugated iron roofing on top.



Thousands of these are put up every year.
Usually 20ft x 20ft or 20ft x 30ft.

Simple cheap and effectively doing the required job.
Justanoldguy is offline   Reply With Quote
Old 07-01-2009, 01:59 AM   #10
Justanoldguy
Senior Member
 
Justanoldguy's Avatar
 
Join Date: Jun 2008
Location: Mangakino New Zealand
Posts: 2,804
Default Re: Any reason to not make my own rafters?

Here is a shot of the outside.



.
Justanoldguy is offline   Reply With Quote
Old 07-01-2009, 09:15 AM   #11
rsanter
Senior Member
 
rsanter's Avatar
 
Join Date: Dec 2007
Location: visalia ca
Posts: 10,903
Default Re: Any reason to not make my own rafters?

there is no reason you cant do it yourself
that is the way it was done for many years before the prefab truss was created

it is just that it is up to you to fab and design it to the requirments it will see, that is part of the reason that the industry has moved in the prefab direction along with increased labor and decreased skill levels in the construction industry

bob
__________________
my wife says that I have never met a tool I havent liked. people on the other hand......
rsanter is online now   Reply With Quote
Old 07-01-2009, 09:54 AM   #12
wot sales
Junior Member
 
Join Date: Dec 2007
Location: ann arbor
Posts: 22
Default Re: Any reason to not make my own rafters?

My new garage addition, 16’x28’, doesn’t have rafters or trusses. It’s built the same as my house – plank on beam construction. That’s not ‘post and beam’. Roof decking is 2x6 Douglas Fir tongue and groove, beams are glulams on 8’ centers, 5-1/8x16-1/2 in the center and 3-1/2x12 at the sides – no ridge beam either – gusset plates at the center. Roof is 3 in 12 pitch.
Expensive maybe, but looks cool and all open the roof. Only disadvantage is no rafters to store junk.
Attached Images
File Type: jpg DSCN0951.jpg (150.7 KB, 54 views)
File Type: jpg DSCN0944.jpg (143.5 KB, 66 views)
File Type: jpg DSCN0952.jpg (147.8 KB, 56 views)

Last edited by wot sales; 07-01-2009 at 09:59 AM. Reason: add photo
wot sales is offline   Reply With Quote
Old 07-01-2009, 10:07 AM   #13
Stuart in MN
Senior Member
 
Stuart in MN's Avatar
 
Join Date: Sep 2005
Location: Minneapolis
Posts: 8,309
Default Re: Any reason to not make my own rafters?

Depending on local codes and inspections, you may or may not be able to get away with building your own trusses. For a shed it's probably okay but for a house these days I suspect the trusses have to be commercially built and/or have an engineer sign off on them.
Stuart in MN is offline   Reply With Quote
Old 07-01-2009, 01:40 PM   #14
blkhonda1991
Senior Member
 
Join Date: May 2008
Location: Connecticut
Posts: 546
Default Re: Any reason to not make my own rafters?

Quote:
Originally Posted by nate379 View Post
What is the difference between a truss and rafter? I thought they were the same?
conventional framed roof


truss roof
blkhonda1991 is offline   Reply With Quote
Old 07-01-2009, 01:46 PM   #15
kbs2244
Senior Member
 
Join Date: Nov 2006
Posts: 6,390
Default Re: Any reason to not make my own rafters?

If you are going to have to have it inspected talk to them first.
I helped on an addition to a church once.
We were just going to make the existing room longer.
It had a very low crown on the prefab trusses, but they were about 3 feet deep and 30 long.
We told the inspector we were going to make out own but copy the existing ones.
He said that was OK.
But we glued and screwed the joints with plywood gussets instead of the gang nails used on the prefab ones.
He was upset about that and made us find a used glue tube to show him what was used.
He ended up passing us, but the trouble could have been avoided with a little conversation beforehand.
kbs2244 is offline   Reply With Quote
Old 07-01-2009, 07:01 PM   #16
Kev442
Senior Member
 
Kev442's Avatar
 
Join Date: Jan 2009
Location: Wi
Posts: 2,580
Default Re: Any reason to not make my own rafters?

Made my own trusses for the pole building. Followed the free Canadian instructions. 24" OC, 3/4" sheathing. Used the PL (forgot which number, 400?), screwed and nailed. The only thing the inspector had me do different was use a steeper pitch.

Oh yeah,why did I do it? Because I would have had to cut down 30 or 40 trees to get a truss truck and crane in there.
Kev442 is offline   Reply With Quote
Old 07-01-2009, 08:29 PM   #17
nate379
Banned
 
Join Date: Feb 2009
Location: Palmer, AK
Posts: 7,298
Default Re: Any reason to not make my own rafters?

No inspection. I don't even need to pull a building permit.

I'm pretty sure I'm going to do it. They are going to be 18ft so not anything huge. 2x6 top beams and 2x stringer and supports (whatever you want to call them). Instead of using simpsons I will just cut some OSB or plywood for gussets.

Last edited by nate379; 07-01-2009 at 08:35 PM.
nate379 is offline   Reply With Quote
Old 07-01-2009, 09:56 PM   #18
Kev442
Senior Member
 
Kev442's Avatar
 
Join Date: Jan 2009
Location: Wi
Posts: 2,580
Default Re: Any reason to not make my own rafters?

Google Canada Plan Service and you will find the 2 or 3 pertinent to trusses.
Kev442 is offline   Reply With Quote
Old 07-01-2009, 11:52 PM   #19
Justanoldguy
Senior Member
 
Justanoldguy's Avatar
 
Join Date: Jun 2008
Location: Mangakino New Zealand
Posts: 2,804
Default Re: Any reason to not make my own rafters?

Quote:
Originally Posted by nate379 View Post
No inspection. I don't even need to pull a building permit.

I'm pretty sure I'm going to do it. They are going to be 18ft so not anything huge. 2x6 top beams and 2x stringer and supports (whatever you want to call them). Instead of using simpsons I will just cut some OSB or plywood for gussets.
Well I for one, would steer way clear of OSB for gussets.. Use ply, glued and screwed.
Justanoldguy is offline   Reply With Quote
Old 07-02-2009, 12:17 AM   #20
nate379
Banned
 
Join Date: Feb 2009
Location: Palmer, AK
Posts: 7,298
Default Re: Any reason to not make my own rafters?

I will more than likely use it. My Dad has been working at an OSB mill for 27 years and they are talking of shutting down the plant. If I can buy a couple sheets here and there maybe it will keep him in a job. Can only hope huh?

http://huberwood.com/
nate379 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 11:15 PM.