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Old 08-09-2017, 12:03 PM   #1
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Insulating/venting shed


Hi. New to forum and diy, so please be kind.

I am converting a shed into a studio for music and am currently stuck. It has a corrugated metal roof laid over wood planks. I haven't yet looked too see what, if anything, is between metal roofing and wood planks. Someone has already put insulation batt in rafters. I want to drywall the ceiling for a more finished look.

Should I:
1) leave insulation, put up sheetrock for ceiling and call it good.
2) take out insulation and put new insulation in ceiling joists instead, then do sheetrock.
3) leave insulation in rafters AND add insulation in joists and then sheetrock.
4) do any of the preceding ideas and add some sort of vent(s)

I live in Seattle. The enclosed space ("attic"), after adding sheet rock we'll measure only approximately 100 cubic feet.

The "living space" is well ventilated with two windows.

Attached are some pictures.

Thank you for any help you offer.

Joe
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Insulating/venting shed-20170809_094131_1502297939338.jpg   Insulating/venting shed-20170809_094102_1502298055099.jpg  
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Old 08-09-2017, 03:03 PM   #2
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Re: Insulating/venting shed


Will you be cooling or heating the shed.
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Old 08-09-2017, 03:15 PM   #3
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Re: Insulating/venting shed


Hi Kunkel and welcome to the forum.
If you add drywall across the bottoms of those ceiling joists then you do not want the insulation in the rafters. A standard approach would be to move that insulation down to the ceiling and then create some ventilation for the attic space above. There is not a lot of room up there and I doubt you will need to meet local energy codes for this small space but as much as reasonably possible would be good. Soffit vents for low venting and ridge or gable vents for high.

Bud
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Old 08-09-2017, 05:47 PM   #4
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Re: Insulating/venting shed


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Will you be cooling or heating the shed.
Good question. In the coldest months of winter, I will be using an oil-filled space heater.

Joe
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Old 08-09-2017, 06:00 PM   #5
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Re: Insulating/venting shed


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Hi Kunkel and welcome to the forum.
If you add drywall across the bottoms of those ceiling joists then you do not want the insulation in the rafters. A standard approach would be to move that insulation down to the ceiling and then create some ventilation for the attic space above. There is not a lot of room up there and I doubt you will need to meet local energy codes for this small space but as much as reasonably possible would be good. Soffit vents for low venting and ridge or gable vents for high.

Bud
Thanks for the response and welcome, Bud.

Is the venting going to be more about moisture or energy codes? Would I need to do BOTH ridge venting and soffit venting? Attached is what the eaves look like. The soffit venting might look like something in the second picture, yes?Insulating/venting shed-20170809_155413-1-.jpg

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Old 08-09-2017, 06:06 PM   #6
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Re: Insulating/venting shed


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Originally Posted by Kunkel19 View Post
Good question. In the coldest months of winter, I will be using an oil-filled space heater.

Joe
If you are not adding heat or cooling insulation is a waste of effort.

I would pull the insulation and make sure you have venting under the eaves on both sides. If you can't get venting at the ridge then second best would be a small vent one each gable end. Lay non papered batts across the joists and then the paper faced between the joists. In order to stop the insulation from blocking the vents at the eaves you would need chute stapled to the roof sheeting.
http://www.homedepot.com/p/ADO-Produ...4480/100533902

That will save you a few degrees in summer and really help in the winter.
When you do drywall it will want to be taped filled and painted to keep moist out of the attic,
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Old 08-09-2017, 06:11 PM   #7
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Re: Insulating/venting shed


Quote:
Originally Posted by Nealtw View Post
If you are not adding heat or cooling insulation is a waste of effort.

I would pull the insulation and make sure you have venting under the eaves on both sides. If you can't get venting at the ridge then second best would be a small vent one each gable end. Lay non papered batts across the joists and then the paper faced between the joists. In order to stop the insulation from blocking the vents at the eaves you would need chute stapled to the roof sheeting.
http://www.homedepot.com/p/ADO-Produ...4480/100533902

That will save you a few degrees in summer and really help in the winter.
When you do drywall it will want to be taped filled and painted to keep moist out of the attic,
Thanks for all the info! If the insulation isn't wet or crushed at all, do you think I could reuse it?

Joe
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Old 08-09-2017, 06:19 PM   #8
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Re: Insulating/venting shed


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Originally Posted by Kunkel19 View Post
Thanks for all the info! If the insulation isn't wet or crushed at all, do you think I could reuse it?

Joe
Let it dry if it is wet. Just throw it out in the sun for a few days.It is just glass.
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Old 08-09-2017, 06:20 PM   #9
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Re: Insulating/venting shed


Venting the attic space is about moisture. During cold conditions any air that seeps through to that space will find a cold roof and form condensation/ice.

You would want some of each, high and low venting. I don't think the normal rules apply as no showers, large gatherings, cooking (minimal), and other normal moisture sources so some venting is probably close enough.

Is that heater you are considering vented to the outside. Being a combustion appliance it will also need combustion air coming in. If well insulated electric heat might be more appropriate for that size space.

Bud
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Old 08-09-2017, 06:30 PM   #10
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Re: Insulating/venting shed


Quote:
Originally Posted by Bud9051 View Post
Venting the attic space is about moisture. During cold conditions any air that seeps through to that space will find a cold roof and form condensation/ice.

You would want some of each, high and low venting. I don't think the normal rules apply as no showers, large gatherings, cooking (minimal), and other normal moisture sources so some venting is probably close enough.

Is that heater you are considering vented to the outside. Being a combustion appliance it will also need combustion air coming in. If well insulated electric heat might be more appropriate for that size space.

Bud
It's one of these jobbers in the picture below. I don't think combustion is part of it. Maybe I misnamed it?

I have a working wall mounted electric heater I was considering actually...

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Old 08-09-2017, 06:44 PM   #11
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Re: Insulating/venting shed


If the one pictured is oil filled electric that would be fine, the oil adds mass to release the heat at a slower rate. But ant electric heater would be fine. Let the hot air blow through a stack of bricks and you have the mass advantage. The key is, for a small space you don't want any combustion.
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Old 08-11-2017, 04:55 PM   #12
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To help me with my understanding, could someone please explain why it would not be good to put up drywall and just leave insulation in rafters?

Thanks,
Joe
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Old 08-11-2017, 07:51 PM   #13
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Re: Insulating/venting shed


Small amounts of moisture are still going to move through drywall due to its permeance. Same reason food products get freezer burn when wrapped in plastic, the moisture can move through it. With fiber insulation it traps that moisture and creates the conditions necessary for mold. Different type of ceiling but same results pictured in this link.
http://www.greenbuildingadvisor.com/...hedral-ceiling

Bud
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Old 08-17-2017, 04:57 PM   #14
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[QUOTE=Bud9051;4515881]Small amounts of moisture are still going to move through drywall due to its permeance. Same reason food products get freezer burn when wrapped in plastic, the moisture can move through it. With fiber insulation it traps that moisture and creates the conditions necessary for mold. Different type of ceiling but same results pictured in this link.

Thanks again. So I thought there was Ridge venting because of foam I saw under cap. When I took the cap off, I found this (picture). To make this an actual vent, do I need to saw a hole through this black paper to the open air in the attic below?
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Old 08-17-2017, 05:18 PM   #15
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Re: Insulating/venting shed


If there was an actual ridge vent over that and it was intended to be ventilation and not decoration then the black paper, underlayment, should probably have been cut away to permit air flow. I hedge a little as this is a shed and hard to be positive from my chair.

Bud
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