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Old 04-27-2012, 05:59 PM   #1
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Shed roof question - rafter layout


Shed roof question - rafter layout-greenhouseb.jpg
Actually this is to be a greenhouse.
I'm a bit nervous about the way the rafters sit on the wall.
Do you think a supporting block screwed to the wall studs would help - if so how would you go about screwing it - the block would be 3 1/2" wide.
Shed roof question - rafter layout-greenhousec.jpg

Cheers!

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Old 04-27-2012, 06:59 PM   #2
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Shed roof question - rafter layout


if no over hang i adjust my rafter so the part you are proposing to put block under lands on top of wall then cut tail of rafter so it is flush with outside of wall.
i also will put a simpson strong tie h1 on the inside of wall on rafter layout before installing rafters to make it easy to hold on layout to nail rafter to wall then go back after all are set and nail hanger to rafter.
link to h1 hanger
http://www.google.com/products/catal...ed=0CEEQ8wIwAw

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Old 04-27-2012, 07:23 PM   #3
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Shed roof question - rafter layout


The drawing your showing has the rafters cut wrong. It should look like this.
http://images.search.yahoo.com/image...mb=cpCLpHoH11V
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Old 04-27-2012, 10:40 PM   #4
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Shed roof question - rafter layout


Will you be using ceiling joists or collar ties? Or a post under the ridge? What will keep the roof from trying to spread the walls?
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Old 04-28-2012, 06:16 PM   #5
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Shed roof question - rafter layout


Thanks for the replies!

Jay,
Good idea about having the rafter fully supported and the sharp end cut off. Also the ties. I'll do both.

Joe,
Yeah, I know what you mean - your way also provides for a gutter system if necessary and it also looks a lot better. However, this is a green house and I think the original designers thought an overhang would cut out too much light to the plants inside.

RatherBeFishing,
Well, they are not included in the original plans:
http://www.buildeazy.com/greenhouse5-1.html

But I was a bit nervous about the two rafters just being held together with a piece of plywood so I was actually thinking of collars ties, 1x4" would be OK, right? I never thought about the roof pushing the walls apart - wow! Would collar ties prevent that?

Here's another view with detail of the first rafter. The long rafters are joined with metal strapping and the short ones with blocking.
Shed roof question - rafter layout-rafters.jpg

Cheers!
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Old 04-28-2012, 06:32 PM   #6
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Shed roof question - rafter layout


2 X 6's would be better for collor ties, Less likly to split when nailed.
Without some over hang all the water running off the roof is going to end up running down the widows and siding which will end up causing problums.
Your also far better off having this shed no closer then 8" to the ground.
If not the sidings going to rot out.
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Old 04-28-2012, 06:52 PM   #7
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Shed roof question - rafter layout


Quote:
Originally Posted by joecaption
2 X 6's would be better for collor ties, Less likly to split when nailed.
Without some over hang all the water running off the roof is going to end up running down the widows and siding which will end up causing problums.
Your also far better off having this shed no closer then 8" to the ground.
If not the sidings going to rot out.
Collar ties must be min 1x4. Most builders use 1x4, from what I've seen. 2x6 seems like serious overkill
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Old 04-28-2012, 07:32 PM   #8
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Shed roof question - rafter layout


Joe,
Well, I didn't want to go with pressure treated wood but I think I'll have to. Thanks for pointing out the limitation of that roof design.

Cortell,
Thanks - I think I'll go with 1x4"s and use deck screws to attach to the rafters.

Cheers!

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