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Old 08-17-2017, 05:36 PM   #16
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Re: Insulating/venting shed


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Originally Posted by Bud9051 View Post
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
Thanks one more time for all the help you're offering. I really appreciate you and this forum.

The shed was originally sort of storage area that has been slowly added to by the previous owner and myself. If I had to guess, I would suppose that it is not officially vented. The foam pieces that lie between the ridge cap and the roof sections are not perforated and the gap between the meeting roof pieces does not always have the gap pictured. In many places there is virtually no gap.

That being said, to make this a legitimate roof vent, could I cut through the underlayment (it's very easy to get through), replace the solid foam with a vented foam material and reattach the cap? Do you think that would be acceptable? If so, how wide should the gap in the underlayment be and for what length of the roof should it be cut?

Or would it be better to go with gable vents?

Thanks a million,
Joe
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Old 08-17-2017, 05:45 PM   #17
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Re: Insulating/venting shed


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Originally Posted by Kunkel19 View Post
Thanks one more time for all the help you're offering. I really appreciate you and this forum.

The shed was originally sort of storage area that has been slowly added to by the previous owner and myself. If I had to guess, I would suppose that it is not officially vented. The foam pieces that lie between the ridge cap and the roof sections are not perforated and the gap between the meeting roof pieces does not always have the gap pictured. In many places there is virtually no gap.

That being said, to make this a legitimate roof vent, could I cut through the underlayment (it's very easy to get through), replace the solid foam with a vented foam material and reattach the cap? Do you think that would be acceptable? If so, how wide should the gap in the underlayment be and for what length of the roof should it be cut?

Or would it be better to go with gable vents?

Thanks a million,
Joe
Usually an inch on each side of center or if there is ridge board in the way 1 1/2 - 2 inches on each side
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Old 08-17-2017, 05:59 PM   #18
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Re: Insulating/venting shed


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Originally Posted by Nealtw View Post
Usually an inch on each side of center or if there is ridge board in the way 1 1/2 - 2 inches on each side
So I would set a circular saw to go through the underlayment and sheathing, measure out from both sides of the ridge, cut most of the length of the roof, leaving some room at either end, lay down something like this:

http://www.bestmaterials.com/detail....hoChaMQAvD_BwE

And screw the cap back on? Is that correct?

Is this more or less work/money than gable venting?

Joe
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Old 08-17-2017, 06:01 PM   #19
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Re: Insulating/venting shed


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Originally Posted by Kunkel19 View Post
So I would set a circular saw to go through the underlayment and sheathing, measure out from both sides of the ridge, cut most of the length of the roof, leaving some room at either end, lay down something like this:

http://www.bestmaterials.com/detail....hoChaMQAvD_BwE

And screw the cap back on? Is that correct?

Is this more or less work/money than gable venting?

Joe
Yes..............
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Old 08-19-2017, 11:18 PM   #20
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Re: Insulating/venting shed


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Originally Posted by Kunkel19 View Post
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
if you drywall the sloped ceiling then you could leave the insulation, but because you are planning to drywall the flat ceiling, you would create a dead air space that is not conditioned. this will cause convection to occure and will eventually warp and discolor the drywall.

i would pull the fiberglass out and dense pack celllulose in the flat ceiling and then drywall. you can net the ceiling before you blow the ceiling and then hang the drywall over that.

cellulose is 90% sound deadening as well. i used it in my band spot in my 20's. kept the police from ticketing us for noise violations.

Joseph

www.AIRLOCK-Insulation.com
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Old 08-20-2017, 04:27 AM   #21
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Re: Insulating/venting shed


I agree with Airlock regarding where the insulation should be... between the ceiling joists... and in addition think that for a shed, gable vents would be preferable. If you have a ridge board, it doesn't look like you have 3" between your metal roofing anyway... and removing the foam closure to allow ridge ventilation could allow wind blown rain and/or snow in. Just a thought.
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Old 08-20-2017, 09:05 AM   #22
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Re: Insulating/venting shed


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Originally Posted by XSleeper View Post
I agree with Airlock regarding where the insulation should be... between the ceiling joists... and in addition think that for a shed, gable vents would be preferable. If you have a ridge board, it doesn't look like you have 3" between your metal roofing anyway... and removing the foam closure to allow ridge ventilation could allow wind blown rain and/or snow in. Just a thought.
yes! great point.

Gable vents are cheap and easy to install and will help prevent problems such as condensation and overheating in the attic. this will help it last a lot longer by not warping and wetting the attic space. that is why ventilation is necessary. In my opinion

Joseph

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Old 08-20-2017, 09:17 AM   #23
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Re: Insulating/venting shed


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Originally Posted by Kunkel19 View Post
So I would set a circular saw to go through the underlayment and sheathing, measure out from both sides of the ridge, cut most of the length of the roof, leaving some room at either end, lay down something like this:

http://www.bestmaterials.com/detail....hoChaMQAvD_BwE

And screw the cap back on? Is that correct?

Is this more or less work/money than gable venting?

Joe

cutting out the ridge for installing a vent is a good idea, it is more work than installing gable vents, and you have to go up on the roof. but can be very effective for adding air flow.

Joseph

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Old 08-20-2017, 11:38 PM   #24
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Re: Insulating/venting shed


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Originally Posted by AIRLOCK View Post
if you drywall the sloped ceiling then you could leave the insulation, but because you are planning to drywall the flat ceiling, you would create a dead air space that is not conditioned. this will cause convection to occure and will eventually warp and discolor the drywall.

i would pull the fiberglass out and dense pack celllulose in the flat ceiling and then drywall. you can net the ceiling before you blow the ceiling and then hang the drywall over that.

cellulose is 90% sound deadening as well. i used it in my band spot in my 20's. kept the police from ticketing us for noise violations.

Joseph

www.AIRLOCK-Insulation.com
Care to explain how you get a dead air space above a flat ceiling when you have ridge vents and what does that have to do with fiberglass?
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Old 08-31-2017, 09:26 AM   #25
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Re: Insulating/venting shed


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Originally Posted by Nealtw View Post
Care to explain how you get a dead air space above a flat ceiling when you have ridge vents and what does that have to do with fiberglass?
sure. thanks for asking that question.

IF Ridge vents are installed, or gable vents are installed to where there is adequate ventillation, then there would not be dead air space.

leaving the existing insulation is not the best, because it can cause dead air space can and does happen if baffles (air vents) are not installed. i would remove the fiberglass to eliminate the condensation that will ocure between the fiberglass and the sheathing.

also if the fiberglass is removed, you can see the under side of the roof if there is ever a leak. you can pin point it easier. small detail but i like to see the attic roof if possible.

i hope this makes sense. let me know if i can clarify better.

Joseph Wolf
www.AIRLOCK-Insulation.com
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Old 08-31-2017, 04:20 PM   #26
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Re: Insulating/venting shed


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Originally Posted by AIRLOCK View Post
sure. thanks for asking that question.


Joseph Wolf
www.AIRLOCK-Insulation.com
Thank you; I miss read the other post. Oops
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