Seems like your description:
"A chimney has only one pressure boundary pushing air into it resulting in a continuous flow of air which exits without the need for another "delta-p" at the other end"
doesn't jibe with…"
"Not knowing your climate zone, here are some thoughts.
2500 ft2 of well insulated and sealed building should only need one system. In our 5000-5500 DD, we go to about 4000+ feet (basements not included) with one system.
The trick is in the…"
"Comment by Ed Minch just now
Delete CommentBottom line, if the Bonus Room can’t be designed out of the plans, then put it on a separate controlled zone, make sure it’s really well air sealed by testing it with a blower door…"
I think I have come up with a way might make almost everyone happy:
Hot air rises while denser cold air falls, but since gravity is the force that is causing it, it is the cold air that starts the cycle.
"Brad, my belief is that "it depends" is so much a factor here that a study would be meaningless. The extremes would be if the batt has fallen at one end, and would be insulation properly contacting the interior drywall and no wind…"
"Covering the kneewall back serves 3 purposes. 1) it prevents the batts from falling off later on 2) it forces the batt to contact the drywall 3) it prevents wind washing.
This is why it is very hard to measure the effect of covering the…"
I am not getting that you need to cover the kneewalls according to this provision. You can have an airtight kneewall with no back on it. I think what they are talking about is "below" the kneewall, between the joists.
What you are saying makes sense:
"The cold air ends up at the bottom because it is heavier. The hot air moves to the top because the cold air displaces it."
However, if there were no warm air to get out of the way, the cold air would…"
"As has been said - very hard to quantify because the starting point varies so much. Bud - house wrap is an anti-vapor barrier but I get what yo are saying and we use rigid foam to combat this,
An unquantifiable component is the…"
"Hot air rises" is true, and I think there is nothing confusing about it.
1) What we want is a blanket of cool(er) air coming through the soffit vents and rising along the rake of the roof to go out the ridge, this takes the warmest…"
"Be careful, you might be setting yourself up for a patent troller trying to get a monthly fee from you. Should we all be getting an assurance from our suppliers that they will defend us if this happens?"
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Hot air DOES rise, but cool are also falls. You don't get one without the other. It sounds like you are giving cool air the power to mystically de-levitate itself.
I'll keep saying "hot air rises" because it is…"
"I agree completely with Sean
Further, it can depend on what type of sheathing the house has. In the mid-Atlantic we see mostly:
Balloon framing, no sheathing, siding on studs - insulation against the back of the siding
Balloon framing, 1X8 sheathing…"
"It appears that the reason the shop is not heating now is that the supply is not big enough. Add to that the second floor (attic?) system has to push warm air down 2 stories, and that was a bad idea. So yes, close that off.
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