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Old 07-14-2009, 09:55 PM   #16
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How should I insulate my shed?


hey folks,

so if i raise the ceiling joists up one foot the raised ceiling height will be 8' 6" which would be perfect.

here is my drawing:



i'm a newbie at this stuff so please bear with me here.

the span where the bottom of the rafter meets the bottom of the joist (red beams) is going to be right at 12 feet and it's going to fall at about 1 to 1.5 feet up the rafter board from where the rafter meets the top of the framing. the roof pitch is 5:12. i'm planning on using 2 x 8's for the ceiling joists at 24" on center. the way i understand it, if the joist is attached to the rafter and it is in the bottom third of the height of the top of the roof to where it meets the rafter, then it is considered a rafter tie and could help form a stronger roof system. the collar ties are every 48" and they're staying! i will not be using what's left as attic space for any type of storage. i just want to hang sheetrock for a ceiling and add insulation in that space.

i have a few more questions so here goes:

1) do you think i should sister the rafter with another 2 x 6 in this 2 foot region (from the frame up past where the rafter meets the ceiling joist) to help brace the rafter against the new vertical load of a 2x8 plus 1/2" sheetrock? i'm not sure how much this would help since the joists will be pretty close to the base of rafter and framing.

2) would it be necessary or a good idea to place a strongback or ribband down the center of the joist span to prevent bowing and swaying?



3) how should i actually attach the joists to the rafters? nails? screws? or 1/2" 4" long hex bolts?

4) i've spent a few days searching the web for examples of what i'm doing and i've found others who have discussed doing the same but haven't seen any finished photos or even summaries of how it turned out. *sigh* would you consult a structural engineer?

thanks everyone - i'm probably overthinking this but i really want to have a solid plan before i begin.

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Old 07-14-2009, 09:58 PM   #17
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How should I insulate my shed?


If the shed isn't built then 9' walls might be a better/easier idea
I did 9' walls in my sunroom - big difference
And then you can just put ceiling joists straight across
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Old 07-15-2009, 11:26 AM   #18
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How should I insulate my shed?


yes, dave, i think you're right. 9' walls would be the easiest but it's not really possible and not worth the expense at this point. i'm just going to run 2x8's at 16 o.c. straight across the top plate of the framing. that'll give me a solid 7' 7" or 7' 8" ceiling. with recessed lighting that should be sufficient for a nice conditioned workspace and enough attic space for insulation.

thanks for setting me straight with this issue. i needed some direction there.
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Old 07-15-2009, 11:30 AM   #19
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How should I insulate my shed?


Another thought
If they use 8' studs & have a bottom & top plate that equals 8' 3"
Every little bit helps
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Old 06-21-2010, 08:50 AM   #20
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How should I insulate my shed?


KBIzzle shidizzle wizzle nizzle !

LOL - Sorry, I couldn't resist.

I have a very very similar project going on and I'm about to finish up. I would like to know how yours turned out and if you have had any moisture problems in your mini-attic area and did you go with vents in the mini-attic or did you seal it all off and go with a hot roof design? Hot roof, basically means you have no ventilation up in the attic.

I am thinking about going hot roof, because I have gone to much great length to air seal the shed off from the outside (lots of bugs around here) and I wanted it to be as efficient as possible energy-cooling-wise.

I am thinking about if I should put insulation over my ceiling sheetrock or just not put any, because I have radiant barrier laminated to the underside of the roof sheath/decking. Without a ceiling in there yet it seems to do pretty well temperature wise with no a/c assistance, but I am wondering how it will do after I put a ceiling in and it has less air to circulate and move with.

I was thinking, if i do it all like this, that maybe I could put 2 small ceiling vents, strategically placed, and my a/c would cool the workspace area and slowly vent/condition the attic area too...whilst all I'd have up in the attic is the radiant barrier on the roof decking and I was thinking about putting foamular insulation right above and in contact with the ceiling sheetrock sealed at the edges with spray foam.

There is not much space that would remain in the mini attic, so I really don't think it would impact my a/c bill much.

Here is a graphic of what space I'm dealing with and keep in mind that the ceiling/sheetrock/insulation don't exist yet.


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