Attic converted to bedroom - Proper ventilation?

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Old 08-21-19, 08:19 AM
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Attic converted to bedroom - Proper ventilation?

I have an attic that is on the same level as our second story. It was drywalled a long time ago but the drywall goes right to the peak of the roof, but I tore all that out. So there is no ventilation from the outside wall or roof. What is the proper way to vent it to be more comfortable for a bedroom?

My plan was to level it off at about 8 feet and leave about a foot of the peak open above and put a gable vent on the outside of the house wall. Is that enough? Or would I need roof vents above that too?

I attached photos of what the attic looked like before I tore out the drywall. Insulation is all still good besides in a couple spots I need to replace.

Any ideas would be great.

Thanks!
 
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Old 08-21-19, 08:21 AM
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So to clarify, are you asking about the ventilation needs of the attic, above the drywall, or the room itself?
 
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Old 08-21-19, 08:27 AM
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Yeah I tore all that drywall out. And I want to turn this into a bedroom for my son. But it gets sooo hot in the summer time, was hoping to frame down that peak and leave about a foot above and put a gable vent above that outside window that would be above the framed in part. Hoping some proper ventilation above the room will help it stay cooler in the summer time.
 
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Old 08-21-19, 08:42 AM
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The hot attic is most likely due to insufficient insulation. Most climate zones (we don't see yours) require r-40 or more.
A single gable vent would not be large enough in the space you suggested and best would be a ridge vent. There would also need to be a lot of low soffit venting for air to get in.

There are other issues for converting an attic to living space but i won't get into permits and inspections. I mentioned it so that is on you.

Bud
 
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Old 08-21-19, 08:56 AM
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Alright, maybe I will bring someone in that can get me started. Know a few guys. Just thought it might be something as simple as frame it off and gable vent it.
 
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Old 08-21-19, 09:02 AM
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I know a lot of the houses with cathedral ceilings installed today are using spray foam. Local code here is now R50 if not R60 for roof. What size is the trusts?

Not a fan of working with spray foam, but it will resolve the space issue a bit and help with hot/cold
 
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Old 08-21-19, 09:34 AM
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Hi Kallas, not trying to scare you off but attics are difficult to do and meet best practices at a reasonable cost . It gets hot up there because that roof is being hammered with solar energy. Blocking that much heat is no small task thus the r-numbers mike mentioned.

if the budget will handle it, spray foam does do the job with the least amount of space in addition to eliminating the ventilation entirely. I'll add a related link.
https://www.greenbuildingadvisor.com...p-of-roof-down

The other option is to remove the shingles and add 4 to 6" of rigid on top then new sheathing and new shingles. I'll cross that one off for you .

Bud
 
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Old 08-21-19, 09:39 AM
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Wow thanks. I didn't know spray foam did that good of a job. I will look into that for sure, that looks much easier...
 
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Old 08-21-19, 10:34 AM
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Take a chill pile before you get a price quote but when you consider what work you will eliminate it makes the decision a lot easier. Plus, it will work.

Bud
Note that was Mike's suggestion .
 
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Old 08-22-19, 09:32 AM
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Thanks again everyone. I am starting to learn more about all of this. I looked up R-49 insulation, but what I read for one of them is that you need 12 inches deep to fit that kind of insulation. I have like 4 inches. So is spray my only option?

Here is what I was looking at..

https://www.homedepot.com/p/Owens-Co...BF92/206161019

Also, it seems a ridge vent is almost a must. Im fine with that, they aren't too hard to do. I was looking at doing a ridge vent and baffles if spray was too expensive. But the conventional fluffy stuff, doesn't seem too cheap either...

But if you use baffles, I don't even have that much room for insulation and a baffle with this cathedral type ceiling..

lol when will one project just be as simple as it was thought out to be...
 
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Old 08-22-19, 10:17 AM
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I have like 4 inches
Which is the main reason you shouldn't put a bedroom up there and expect it to be nice and cool in the summer, or nice and toasty in the winter. It was built to be an attic, not a bedroom. Same goes for the floor joists in your attic. Those joists were meant to be for a ceiling only, and maybe some light storage. Not as a floor, @ 40 lbs/Sq ft live load.

As for the roof, you could reframe the roof, or at least sister the existing using 2x12. (Leaving/sistering the existing is pretty inefficient unless you cover everything with spray foam.) Even then it would still be hot up there unless you have a wall a/c running 24/7 in the summer.
 
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Old 08-22-19, 11:16 AM
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Thanks for the insight. Didn't know that about the floor joists either, learning a lot already. I wonder why they drywalled/insulated it and put the flooring in the way they did then if they were just going to use it for storage... I will bring in a carpenter friend then and see what he would do.


Also is this article correct? It says 2x8's can be sistered. I will measure those and see what I have. I think thats what they are though. Would that work then for the floor?
 
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Old 08-23-19, 08:45 AM
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I went up and measured and the joists are 2 x 8, so it should be good for that span. The ceiling is 2x4s so I will need to sister in something larger on them to fit the insulation then correct? Would a 2x8 work for that or would I need a 2x10 or 12? I will also put in a ridge vent across the top and run baffles to the soffit.

I noticed on the rest of my house I dont have any roof vents or ridge vents. Just gable vents with soffit. No way I am ripping out all the bedrooms and redoing the whole upstairs... I do have an attic space above my second story that requires climbing up through a hole in the ceiling. But haven't looked up there in awhile. So maybe installing a ridge vent on the rest of the house might be enough. Hopefully that can be done when I get a new roof.
 
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Old 08-23-19, 06:11 PM
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Will your son have two exits from the room in case of a fire?
 
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Old 08-26-19, 07:18 AM
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Yeah, window and door, no difference than any other room besides the door is like 60 inches tall instead of 80 inches.
 
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