DJL

It took me a few minutes to notice that you were even in the picture. "I encourage all awesome dangerous behavior." - Jeffro Fincher

I voted yes because it's still cheaper than a girlfriend but I hadn't read your qualifier. "I encourage all awesome dangerous behavior." - Jeffro Fincher

It's annoying how many of these well meaning idiots there are who thrive on environmental snobbery. "I encourage all awesome dangerous behavior." - Jeffro Fincher

There's no need for dehumidification, that would waste a lot of energy since you're constanly getting more humid air circulating through the attic. There should be a minimum 1:300 square foot ratio between the attic area and the area of your vents. 60% of that vented area should be for intake and 40% at the upper portion as the outlet. In the South it's better to have your vapor barrier at the outside of the wall/insulation construction because you need to keep that humid air out of the wall/ceiling. The vapor in the wall also needs to be able to pass to the inside/occupied space. For that reason in the South you have to be especially carefull not to use paints that seal the walls and ceiling. You only need an attic fan when there's no way of venting enough heat from the attic regardless of what you do. But remember, the makeup for this air needs to come from the outdoors, not the inside of the house. This makeup air is as cool as the outside air so you're now ideally seeing the same temperature difference across the ceiling assembly as you are across the wall assemblies. It's a last resort, really and the more air you exhaust, the more cool air you're going to suck through the ceiling. Edit: Some clarification as to why people DO use an attic fan. The idea is that you keep the attic at the same temperature as the outdoor air instead of letting it build up. It then sees the same conditions as your walls. I'll see if I can turn the calcs and graphs into something I can post so you can see where it does or doesn't work well enough. The short of it is that if your attic is (an exaggeration) 900 degrees and you have the choice between adding 10 ft of insulation vs. a few vents and a fan then you're probably gonna go for the fan. "I encourage all awesome dangerous behavior." - Jeffro Fincher

Ok, so you were saying that if they start to cover the inlets then they need to add others to maintain the 300:1 ratio of attic area to vent area and the 60:40 ratio between inlets and outlets. Thanks for clarifying that. "I encourage all awesome dangerous behavior." - Jeffro Fincher

Could you clarify this? I'm not sure why additional ventilation is needed or where it's needed. "I encourage all awesome dangerous behavior." - Jeffro Fincher

Oh, I see... so could you do it right adding the extra insulation, as long as it didn't cover the ventilation outlets? No. There's more to it than that. First you need to understand how your individual attic and house works as far as ventilation and vapor/moisture control go. I emphasize YOUR. In this example attic which is some derivation of a gabled roof there is a location for air to enter and to exit. The reason for this (concerning summer season) is that heat can build up in the attic and add heat to the occupied space through the ceiling. That's why you have some combination of air inlets and outlets between the attic and outdoors or even a mechanically exhausted attic. This is independent of the occupied envelope (space within the floors, walls, ceiling) and it needs to be allowed to function properly. The ceiling in this example is what defines the barrier between the attic/outdoors and the occupied space. This is where your insulation must be. There also MUST be vapor control within the ceiling/insulation construction. This is very often ignored. Dumpster could you clarify what you said about insulating an attic? If you're talking about insulating the ceiling against the attic then you're not affecting the temperature in the attic. I assume you're talking about adding insulation on the underside of the roof deck inside of the attic? I'm purposefully leaving out items that relate to the location of the vapor/air barriers because it's different by latitude. For example, read this: Dumb things to do in the South. It talks about moisture control in humid climates. Next up, the mechanical system; it has to be designed for the load and the most important thing is it's ability to dehumidify the air. If the equipment is oversized then it will cool the air without removing the proper amount of moisture. This is difficult to do in a residential setting because most equipment that you're willing to buy has no humidity control. Think of it this way, you size your equipment based on the peak load. You're only hitting that peak load in certain parts of the year. The rest of the time you're in a part-load condition. The solution is to either undersize the equipment so that it dehumidifies in more conditions or buy equipment with dehumidification capabilities. These capabilities are either in the form of fan speed control which reduces the fan speed so that more vapor condenses on the coil, or in refrigeration flow or temperature control. I always have people asking me to design an efficient system and that their willing to pay for it. Well, 25% of your energy loss is through an improperly designed building envelope. This by far exceeds any improvement I can make. "I encourage all awesome dangerous behavior." - Jeffro Fincher

My girlfriend's design build firm in Vermont and upstate NY http://talkbydesign.com/ designs green homes. I'm their mechanical consultant. Their focus is to make the house efficient and high quality. There's no point in making the house green if it's not going to last. The emphasis is getting away from the classic "buy the biggest house you can afford" and instead buying the best house you can afford. It's important to me to preserve the environment but it has to be either beause of my concience, because it's cost effective, or because it's the law. "I encourage all awesome dangerous behavior." - Jeffro Fincher

It does for a lot of other people too: http://www.snopes.com/risque/porn/chambers.asp "I encourage all awesome dangerous behavior." - Jeffro Fincher

My God, I've found someone with worse jokes than mine. Teach me! "I encourage all awesome dangerous behavior." - Jeffro Fincher

Firing altitude seem rather relevant here regarding its relationship with how a container opens after the R closing loop is cut. This isn't the first time we've seen a reserve PC hesitation resulting in a fatality. So, what is it about a rig and the PC that dictates when the AAD should fire? How can a rig be checked to ensure that the flaps open properly and the spring exerts enough force? Helical compression springs aren't exactly uncharted engineering. "I encourage all awesome dangerous behavior." - Jeffro Fincher

I just wanted to quote that out of context. "I encourage all awesome dangerous behavior." - Jeffro Fincher

If you don't mind me asking, why the long haul? The Farm is a nice DZ but that's quite a commute... "I encourage all awesome dangerous behavior." - Jeffro Fincher

If you're making a measurement over 2000 ft with a digital altimeter then you're going to average out pretty well. "I encourage all awesome dangerous behavior." - Jeffro Fincher

Yes. Memorize what your instructor tells you to read. As I said in the other thread you have, work through your instructors. They need you to know specific things first. Once that's done then you have a reference point and can start looking at other sources. "I encourage all awesome dangerous behavior." - Jeffro Fincher

You're going to have a pretty difficult time figuring out your air speed from an Iphone and assuming that you know the actual wind speed you were flying through. If you just hold onto a handheld wind speed gauge and use a digital altimeter to determine altitude loss over a set time then you'll be more accurate. "I encourage all awesome dangerous behavior." - Jeffro Fincher

Where was the cypres located in relation to the burble on the load? "I encourage all awesome dangerous behavior." - Jeffro Fincher

If you haven't started your training yet then don't go looking at these things unless there is something that your instructor wants you to see. You need to get your initial instruction through your school, not from external referenences. There is a specific list that your instructors will want you to understand, it's so that you don't know enough to get yourself and trouble and so that your knowledge is relevant to your lessons. "I encourage all awesome dangerous behavior." - Jeffro Fincher

Build a bridge out of it? "I encourage all awesome dangerous behavior." - Jeffro Fincher

That's a good example of how easy it is to read and understand it too. It's a disorganized collections of ideas, some of which hardly apply anymore and some that contradict what's written later in the same book. "I encourage all awesome dangerous behavior." - Jeffro Fincher

My sister and her family just got back. They said there were literally tons of fat people riding electric scooters. Did you almost get run over too? "I encourage all awesome dangerous behavior." - Jeffro Fincher

Mine works on Bodog so I'm surprised. I'll try the echeck. "I encourage all awesome dangerous behavior." - Jeffro Fincher

Kid had balls. "I encourage all awesome dangerous behavior." - Jeffro Fincher

What do you guys do to buy in. They don't accept VISA or my VISA doesn't accept them. "I encourage all awesome dangerous behavior." - Jeffro Fincher

So I have a nasty bit of back pain and have this old pill from when my gf got her wisdom teeth taken out 7 years ago. What happens when medicine ages? Does it lose its potency, become dangerous? "I encourage all awesome dangerous behavior." - Jeffro Fincher