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Old 05-27-2012, 01:56 PM   #1
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Rebuilding a garage roof - rafter vs truss


We are in the process of buying a weekend home in the country. I've completed an inspection of the house with all systems in pretty good shape. The roof of the detached garage (approx 20 x 20) however needs to be rebuilt. It sags and there is visible rotten wood. The rest of the structure appears sound. I suggested to my home inspector that I would rebuild the roof to the existing dimension and specs. I'm assuming it is a rafter structure - there is drop ceiling and a bunch of tarps up there currently so I couldn't see up in the existing structure.
As mentioned the garage is approx 20 x 20
It's a simple gable roof.
I intend to do do the work myself with a couple of friends.
Does it make sense to go rafters or would I be better off buying trusses?
Thanks for any suggestions.
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Old 05-27-2012, 02:09 PM   #2
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Rebuilding a garage roof - rafter vs truss


For something like that it doesn't get much easier than trusses.

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Old 05-27-2012, 03:15 PM   #3
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Rebuilding a garage roof - rafter vs truss


Second that.
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Old 05-28-2012, 06:05 AM   #4
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Rebuilding a garage roof - rafter vs truss


Thanks for the feedback. Certainly it would save me a ton of time. I'm curious about the cost difference between the two methods. Any thoughts there?
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Old 05-28-2012, 09:17 AM   #5
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Rebuilding a garage roof - rafter vs truss


Part of the cost of working with trusses is the installation. A lot of people hire a crane for a day to lift the trusses into position. There are other ways to do it, but a crane is fast and simple, but of course the rental costs on a crane may be on the order of $500 per day or more, depending on where you are. Stick built avoids the problem of lifting a whole truss into position, but of course takes longer. The only way to figure total cost is to contact a truss supplier, and get a price. They may have access to a crane for installation, so can roll that price into the cost of the trusses.
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Old 05-28-2012, 09:59 AM   #6
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Rebuilding a garage roof - rafter vs truss


It would only take three people to lift and set trusses that small. We have done it with two so I know it can be done.

Is this a wood sided or block walls.
If it's wood it's important to pull stings on the walls and set it straight before setting the trusses with 2 X 4 angle braces.

Set up a strong back on the outside wall on the end to support the first truss.
A strong back is simple 2, 2 X 4's nailed together in the shape of an L.
Pre mark all the top plates for truss locations.

The trusses get set inside the building upside down, one person on each side of the building and one inside with a pole made up to push on the middle of the truss to flip them over.
I'd bet there's a video on You Tube.

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Old 05-28-2012, 12:11 PM   #7
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Rebuilding a garage roof - rafter vs truss


Trusses are more costly if you hire a company to supply and install. If you do it yourself, you will need three or four others to lift the truss into place.

If you use trusses, you will lose your storage space. Trusses should never have anything heavy placed on them, such as a kayak, metal poles, etc. since they are engineered to carry the weight of the roof and no additional weight. If you plan to store objects in the attic of a truss roof, you should have the trusses designed so that they can handle the additional weight.
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Old 05-28-2012, 12:16 PM   #8
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Rebuilding a garage roof - rafter vs truss


http://attictruss-garages.com/
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Old 05-28-2012, 12:40 PM   #9
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Rebuilding a garage roof - rafter vs truss


It will take longer to get the trusses engineered/ made/ delivered, than it would be to stick build. Other than that, kind of a toss up...
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Old 05-28-2012, 01:44 PM   #10
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Rebuilding a garage roof - rafter vs truss


You can buy 20' 4/12 trusses at Menards for $48 each. Cash and Carry.
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Old 05-29-2012, 07:21 AM   #11
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Rebuilding a garage roof - rafter vs truss


Quote:
Originally Posted by kwikfishron View Post
You can buy 20' 4/12 trusses at Menards for $48 each. Cash and Carry.
Yes and I can strap them to the top of my car

I put 25 of these up by myself (helper flaked out). I used a manual genie lift i rented to get them up, they are not very heavy I have seen 2 guys just lift them on the roof with a couple of ladders.

After doing it and figuring the costs including the sheathing and the shingles I figure I may have been better off tearing the building down completely and putting up prefab metal building.
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Old 05-29-2012, 04:27 PM   #12
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Rebuilding a garage roof - rafter vs truss


Quote:
Originally Posted by joecaption View Post
The trusses get set inside the building upside down, one person on each side of the building and one inside with a pole made up to push on the middle of the truss to flip them over.
I'd bet there's a video on You Tube.
I can't say I've ever seen or done it that way before, sounds like a good way to get hurt.

It's pretty easy to set up a temp catwalk/plank down the middle of the garage for the trusses to rest on.

Your stick man would be way more productive on the plank then on the ground.
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Old 05-29-2012, 07:34 PM   #13
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Rebuilding a garage roof - rafter vs truss


Quote:
Originally Posted by joecaption View Post
It would only take three people to lift and set trusses that small. We have done it with two so I know it can be done.

Is this a wood sided or block walls.
If it's wood it's important to pull stings on the walls and set it straight before setting the trusses with 2 X 4 angle braces.

Set up a strong back on the outside wall on the end to support the first truss.
A strong back is simple 2, 2 X 4's nailed together in the shape of an L.
Pre mark all the top plates for truss locations.

The trusses get set inside the building upside down, one person on each side of the building and one inside with a pole made up to push on the middle of the truss to flip them over.
I'd bet there's a video on You Tube.
Joe,

You have experience doing this. Homeowners setting 20' trusses for the first time can be very dangerous unless they have an experienced person there who sets trusses.
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Old 05-29-2012, 07:44 PM   #14
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Rebuilding a garage roof - rafter vs truss


Quote:
Originally Posted by KevinPh View Post
Trusses are more costly if you hire a company to supply and install. If you do it yourself, you will need three or four others to lift the truss into place.

If you use trusses, you will lose your storage space. Trusses should never have anything heavy placed on them, such as a kayak, metal poles, etc. since they are engineered to carry the weight of the roof and no additional weight. If you plan to store objects in the attic of a truss roof, you should have the trusses designed so that they can handle the additional weight.
And you can just pile up weight on some 20' 2x8's right?

One experienced guy and a helper can do 20' trusses any day of the week. Lot of questionable info posted in this thread.
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Old 05-29-2012, 08:13 PM   #15
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Rebuilding a garage roof - rafter vs truss


Quote:
Originally Posted by Joe Carola View Post
Joe,

You have experience doing this. Homeowners setting 20' trusses for the first time can be very dangerous unless they have an experienced person there who sets trusses.
So a homeowner cutting their roof is somehow less dangerous???

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