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john
Insulation or ventulation

Hi. I am inthe processes of trying to lower my energy bill. I have a new hvac system and it is running full out and my house is still 80 on the inside. I had to cut attic access and when i did i found  as iexcpected i have no insulation. So in the process of preping it to blow in insulation i discovered that i have absolutly no ventulation at all up there. So my questions is which would have more bang for the buck. Should i go ahead and put into insulation first or ventulation first. For money reasons i cant do both right now but will go back later and do the other when i can. 

HandyAndyInMtAiry
Re: Insulation or ventulation

John,

I would suggest ventilation. Heat rises, not cool air. I would also suggest looking under the house for the proper foundation vents. Make sure they are open right now. Sound like the HVAC system was not correctly sized for the environment. Or you used flexiable ducts, and they are leaking air. We have no insulation in our Victorian house, and it stays nice and cool(68) in the summer, and warm(72) in the winter. Insulation in the attic is not your only contributing factor here. This is about all I can suggest with the information that you provided.

Andrew

Handy Andy In Mt Airy NC

john
Re: Insulation or ventulation

I have been under the house and yes the vents are open down there. As I get more into this house it seems like it started out as a 2 or 3 room shack in the 1930's or so and they have just added on to it.  The HVAC system is 2 1/2 ton and house is only 1250 sq/ft. The air blowing out is nice and cold. You can feel the heat near the ceiling if you put your hand up there. It feels 20 degree hotter than the air at person level. If you have questions that would help you understand better just let me know. Also I have  been researching the vents and am going to go with a ridge vent for exhaust but have no soffits or eaves to put intake. So I am looking at my options there. Was wondering is putting box vents low on roof would work and am getting mixed answers from on line. Some people say thats fine others say absolutely not. I did see the edge intake vents but would have to buy alot more than I need because stores near me don't sell them so would have to order them but still have found out if I could install them on a roof that is already shingled. All videos and instruction are about new roofs

HandyAndyInMtAiry
Re: Insulation or ventulation

You attic space may be venting from the basement up. Older houses are not designed like new houses. Why do you believe that you need to vent your attic? What is the average temp in your attic? Unless you are planning to use it for living space, a couple gable vents will be more than enough. If you install a ridge vent, you must have air intakes down at the soffit level, and they must match CFPM air flow. If not, you will have small cyclone in your attic. Yes, you may install a ridge vent on an existing shingled roof. But your work may not overcome the amount of air to be exchanged. But that is up to you and an engineer. You need to look at the structure in your attic before you cut into the ridge.

Andrew

Handy Andy In Mt Airy

john
Re: Insulation or ventulation

It's definitely not venting into the crawl space there's nothing there there to vent to. As for the temperature the other day it was around a hundred and forty and the air was stail. I did look into gable vents but I only have one wall That's eligible for a Gable I guess that could be used as the intake but I don't think it's enough air and I would still have to use the ridge vent as an exhaust or another product. but it wasn't the ridge vent that I had a question about installing on a shingled roof it's something called an edge Vent it's for people without soffits and installs near the edge of the roof. It's an intake vent to replace soffit vents. 

Devin
Re: Insulation or ventulation

John - I have seen the edge vent, and am curious about its perfomance and aplicabilty as well.  I have a 1925 bungalow, with open venting to my crawl space (center wall is wide open on top and bottom for plumbing and gas lines), so am also curious on the performance of just a ridge vent, but understand I need to have ample airflow coming from the intake side to properly exchange air.  

It sounds to me like your house is very similiar in construction to mine, and living in Texas we seem to get similiar temps in our attic as you reference, if not a little warmer.  On Airvent's website they have a contractor locater which I used to contact someone in my local area to ask about this exact thing.  Hopefully upon speaking with a contractor about it, I can help to answer some of your questions as well.

I have read as much as the internet has to offer, and most (ok all) point to the fact ridge vents without soffit or similiar solutions do not work.  That said, they do not seem to offer much else in the way of solutions for our particular prediciment, as I believe it to be a unique case.   No offense intended for anyone, at all.  

Suffice to say, I am just as lost as you!

Devin

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