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Old 09-13-2012, 06:08 PM   #1
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insulting shed


I built a 10x16 shed with scraps leftover from our house we built.

I used 2x4 framing in the walls with r11, sandwhiched 2" rtek foamboard on the outside sheathed with 1/2" cdx for the exterior. I used 2x6 framing with insulation for the floor with 1.5" polyiso with 2x4 floor joists to support it on the interior side. I used 3/4" t&g subfloor to help insulate it a little more. for the ceiling I used a gable roof with r-38 insulation.

I siliconed and spray foamed each joist in the walls and ceiling and sealed every gap. I am wondering how I should vent the attic and walls. I was looking at a 12x18 gable vent for the attic. What additional vents do I need.

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Old 09-13-2012, 06:15 PM   #2
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It is a shed right? You would not vent the walls, as for the attic, what shed has one, when it is that small.

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Old 09-13-2012, 06:46 PM   #3
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It is a shed right? You would not vent the walls, as for the attic, what shed has one, when it is that small.
I was concerned about moisture building up on the inside, I was planning to have a small oil fired heater in there for winter use.
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Old 09-13-2012, 07:22 PM   #4
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You will need to leave the door open or window open to allow combustible air in that case, unless the unit you plan on using is high efficient, and draws and exhausts to/from the outside.
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Old 09-13-2012, 07:38 PM   #5
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You will need to leave the door open or window open to allow combustible air in that case, unless the unit you plan on using is high efficient, and draws and exhausts to/from the outside.
Correct, it is a direct vent Toyotomi stove. It pulls air from the outside and vents exhaust out. Temps here can hover in the -50f range for weeks I didn't want to under-insulate.
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Old 09-13-2012, 07:48 PM   #6
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I take it that you must be up in either Manitoba or Alberta then. Helps when you put in the location. Remember, if there is no way for air to recycle from inside the structure, yes any moisture from breathing in there will stay in the space. Making something too air tight is where you have issues.

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