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Old 02-25-2018, 09:31 PM   #1
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Garage Attic insulation


I live in Toronto Canada. Gives you an idea of climate I am dealing with.

I have read different opinions and wanted to hear what is the best approach for getting my garage attic ready for blown in insulation.

After I air seal garage ceiling, do I need a vapour barrier installed before the blown in insulation?
I have a garage heater that is set at around 15 degrees Celsius.

Also since I have continuous soffit vents, if I installed the pink baffle vents would it make sense? Or can I install plywood or use batt insulation to create a barrier and prevent blown insulation from covering the soffit.

I have attached some pics of my garage attic.

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Old 02-26-2018, 05:29 PM   #2
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Re: Garage Attic insulation


Anyone has some direction on my post?

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Old 02-26-2018, 06:23 PM   #3
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Re: Garage Attic insulation


Quote:
Originally Posted by notchy12000 View Post
Anyone has some direction on my post?

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Vapour barrier goes up before drywall
Do not cut the truss to make the hole bigger. frame around access for 14" to contain the insulation.
You can do either plywood or bats to stop the insulation from falling out to the soffet area.
Insulate the access door and weather strip it and have a lock down system.
At this point you are going to rely on drywall finish and paint for vapour barrier.

Last edited by Nealtw; 02-26-2018 at 06:27 PM.
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Old 02-27-2018, 05:12 PM   #4
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Re: Garage Attic insulation


[quote=Nealtw;5217937]Vapour barrier goes up before drywall
Do not cut the truss to make the hole bigger. frame around access for 14" to contain the insulation.
You can do either plywood or bats to stop the insulation from falling out to the soffet area.
Insulate the access door and weather strip it and have a lock down system.
At this point you are going to rely on drywall finish and paint for vapour barrier.
[/quote @Nealtw what do you mean "Do not cut the truss to make the hole bigger"

Also what part of the country do you live in? Curious about your winter and summer climate based on your suggestions.

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Old 02-27-2018, 05:17 PM   #5
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Re: Garage Attic insulation


[quote=notchy12000;5222097]
Quote:
Originally Posted by Nealtw View Post
Vapour barrier goes up before drywall
Do not cut the truss to make the hole bigger. frame around access for 14" to contain the insulation.
You can do either plywood or bats to stop the insulation from falling out to the soffet area.
Insulate the access door and weather strip it and have a lock down system.
At this point you are going to rely on drywall finish and paint for vapour barrier.
[/quote @Nealtw what do you mean "Do not cut the truss to make the hole bigger"

Also what part of the country do you live in? Curious about your winter and summer climate based on your suggestions.

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60 miles east of Vancouver.

Sealing the ceiling of the bathroom is about keeping moisture out of the attic. Anywhere you live.
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Old 02-27-2018, 05:23 PM   #6
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Re: Garage Attic insulation


[quote=Nealtw;5222137]
Quote:
Originally Posted by notchy12000 View Post
60 miles east of Vancouver.

Sealing the ceiling of the bathroom is about keeping moisture out of the attic. Anywhere you live.
Ok thanks .. but my post is about an unfinished attic over a heated garage.

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Old 02-27-2018, 05:27 PM   #7
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Re: Garage Attic insulation


[quote=notchy12000;5222185]
Quote:
Originally Posted by Nealtw View Post
Ok thanks .. but my post is about an unfinished attic over a heated garage.

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Sorry mixed up the threads.
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Old 03-03-2018, 06:30 AM   #8
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Re: Garage Attic insulation


Can anyone else have anything to add?

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Old 03-03-2018, 07:14 AM   #9
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Re: Garage Attic insulation


Hi notchy,
While i review the thread I saw where you mentioned heating the garage. Will it still be used as a garage with snow and rain coming in?

Bud
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Old 03-03-2018, 07:22 AM   #10
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Re: Garage Attic insulation


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Hi notchy,
While i review the thread I saw where you mentioned heating the garage. Will it still be used as a garage with snow and rain coming in?

Bud
Yes it will have cars in and out of the garage on a daily bases during the winter

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Old 03-03-2018, 07:34 AM   #11
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Re: Garage Attic insulation


In the soffit area you want to keep the insulation out and allow the air to flow under the bottom of the roof until it gets past the insulation.

Since vehicles will be bringing in snow and water a vapor barrier will be needed to keep that moisture out of the cold attic and in Canada I think it is required by code. Where to put it now becomes the question. Same for walls. To note, I have see ½" of ice behing insulation left without the drywall and VB all from melted snow. That water evaporated and goes straight for the cold walls.

You will need the plywood or something to block incoming wind from washing right through the insulation. Batts are usually very open to allowing air flow. Some baffles have a built in flap to cover the end to prevent this wind washing.

I assume you have some form of high venting to give the air flow a place to go.

If that attic space is continuous with the attic over the house then the ceiling below will need to be treated as a fire barrier or whatever is required by your code.

Bud
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Old 03-06-2018, 02:56 PM   #12
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Re: Garage Attic insulation


Quote:
Originally Posted by Bud9051 View Post
In the soffit area you want to keep the insulation out and allow the air to flow under the bottom of the roof until it gets past the insulation.

Since vehicles will be bringing in snow and water a vapor barrier will be needed to keep that moisture out of the cold attic and in Canada I think it is required by code. Where to put it now becomes the question. Same for walls. To note, I have see ½" of ice behing insulation left without the drywall and VB all from melted snow. That water evaporated and goes straight for the cold walls.

You will need the plywood or something to block incoming wind from washing right through the insulation. Batts are usually very open to allowing air flow. Some baffles have a built in flap to cover the end to prevent this wind washing.

I assume you have some form of high venting to give the air flow a place to go.

If that attic space is continuous with the attic over the house then the ceiling below will need to be treated as a fire barrier or whatever is required by your code.

Bud
Just a follow up for the curious.
I ended up going with batt insulation. No wind washing will occur and no need to deal with vent baffles

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