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Old 11-23-2016, 11:32 AM   #16
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Re: How are ceiling like this built, framed, and insulated?


@joed

Firstly, how is the wood above the vent in that bottom diagram attached?

Secondly, would you need insulation on top if you're going putting it between the rafters? Say you have rafters 16 oc, couldn't you just nail the top sheathing to the rafters and hang insulation on the inside of the rafters? How would you incorporate a vent with that?

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Old 11-23-2016, 11:41 AM   #17
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Re: How are ceiling like this built, framed, and insulated?


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So if you were to just use something like 2x8s for the rafters, put plywood on the top and hang insulation inside and cover the bottom would that be good a good method? Then you woukdnt need a vent right? Would you still need foam? would you need to caulk or silicone anything?
Spray foam is the only thing you can use without venting.
No other insulation methods will work no matter how much caulk you have..
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Old 11-23-2016, 12:20 PM   #18
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Re: How are ceiling like this built, framed, and insulated?


So you cant do top sheathing with baffles below and then insulation and them cover the bottom with wood or drywall? Wouldnt baffles have to connect at the top for something like this so they dont get clogged eventually?

Pugs you got me confused I dont think caulk is a substitue for venting:

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Old 11-23-2016, 03:08 PM   #19
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Re: How are ceiling like this built, framed, and insulated?


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So you cant do top sheathing with baffles below and then insulation and them cover the bottom with wood or drywall? Wouldnt baffles have to connect at the top for something like this so they dont get clogged eventually?

Pugs you got me confused I dont think caulk is a substitue for venting:
You mentioned insulating the space and trying to seal it with caulk. That simply wouldn't work. Only spray foam is impermeable.

Unless you meant something different, then my bad.
Did you check the link I provided?
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Old 11-23-2016, 03:19 PM   #20
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Re: How are ceiling like this built, framed, and insulated?


@123pugsy

Yeah I read it. But I didn't really explain how venting works for cathedral ceilings. I need typically ventilation goes up above the insulation past it so it doesnt get blocked. well with the ceiling like this is the insulation goes the whole distance because it isn't flat. so if you wanted to insulate between each rafter the baffles wouldnt ever be able to go past the insulation.

Do you absolutely have to insulate the top will insulating between each rafter really not work? and what if there is no overhang. How would you have an inlet to the vent?
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Old 11-23-2016, 04:03 PM   #21
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Re: How are ceiling like this built, framed, and insulated?


Quote:
A couple of ceiling fans up there could blow that wasted energy down in the winter.
There are two types of wasted energy with high ceilings.
The first is you are heating a lot of cubic feet of space that no one is occupying. Say everything above 8 ft.

Second is if the heat is rising and layering, your thermostat will keep the furnace/heater running longer, creating an overheated space above while things are cooler below.

The fans help eliminate the second type of waste, but don't do anything about the first.
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Old 11-23-2016, 05:21 PM   #22
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Re: How are ceiling like this built, framed, and insulated?


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@123pugsy

Yeah I read it. But I didn't really explain how venting works for cathedral ceilings. I need typically ventilation goes up above the insulation past it so it doesnt get blocked. well with the ceiling like this is the insulation goes the whole distance because it isn't flat. so if you wanted to insulate between each rafter the baffles wouldnt ever be able to go past the insulation.

Do you absolutely have to insulate the top will insulating between each rafter really not work? and what if there is no overhang. How would you have an inlet to the vent?
Spray foam, no vent gap, and the job is done.
Without heat getting to the sheathing, there will be no condensation.

No inlet, no venting.

Basically, just like your Coleman cooler is cold inside with no condensation on the outside.
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Old 11-23-2016, 07:17 PM   #23
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Re: How are ceiling like this built, framed, and insulated?


But theres going to have to be insulation not just foam
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Old 11-23-2016, 07:30 PM   #24
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Re: How are ceiling like this built, framed, and insulated?


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But theres going to have to be insulation not just foam
Why?

Foam is the best insulation you can get.
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Old 11-23-2016, 07:53 PM   #25
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Re: How are ceiling like this built, framed, and insulated?


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Originally Posted by craig11152 View Post
We onced worked on a house with 3x6 double tongue and groove decking.
They make 4X6 double tongue and groove decking too.
The right wood in the right location (no snow load) and that stuff can span as much as 20 feet.
So looking at rafters with 4' or 6' spans is not unusual.
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Why?

Foam is the best insulation you can get.
Because s little bit of foam doesn't seem like itd trap heat in like thw sheets you staple in
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Old 11-23-2016, 09:26 PM   #26
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Re: How are ceiling like this built, framed, and insulated?


He's not talking about foam in a can.

He's talking about a truck mounted machine and a professional crew that shoots a 4 inch or more full fill layer.

You can get the machine (rental) from HD, but a pro will do the job better.


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Old 11-24-2016, 05:11 AM   #27
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Re: How are ceiling like this built, framed, and insulated?


Check post # 575.

Total House Rebuild - Bungalow to Two Storey
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Old 11-24-2016, 06:04 AM   #28
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Re: How are ceiling like this built, framed, and insulated?


Wow. Thanks for great suggestions and tips. It helped us a lot. Now, I have an idea on that. Have a great day.
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Old 11-24-2016, 11:47 AM   #29
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Re: How are ceiling like this built, framed, and insulated?


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Wow. Thanks for great suggestions and tips. It helped us a lot. Now, I have an idea on that. Have a great day.
What exact advice did you find useful?
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Old 11-25-2016, 08:03 AM   #30
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Re: How are ceiling like this built, framed, and insulated?


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What does it mean they were suposedt o go 9 inches but you could put your tape up to 12 and the rafters are 16 oc so you can do the math. Whats all that mean?

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