Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Roofing/Siding

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 04-11-2013, 04:07 PM   #1
Member
 
Join Date: Apr 2013
Location: Saginaw, Michigan
Posts: 481
Rewards Points: 298
Default

venting choice?


So, I'm going to have my roof replaced, and I know my perforated soffit vents are gummed up from dust and dirt. So I'm getting quotes, and I think I have 2 choices.

1. Replace the soffits and add more perforated venting. Probably every other piece would be perforated. Slide baffles up in the cavities, make sure something is in place to hold back the blown in insulation from entering the soffits.

2. Use a shingle vent product, like smartvent as the first row. Add baffles, but not worry if the insulation enters the old soffit cavities.

My concern is does the smartvent allow enough airflow under that first foot of roof to prevent ice dams? I know if I replace the soffit entirely, the ice dam problem would go away, but that's more expensive than adding smartvent.

Thanks!

taylorjm is offline   Reply With Quote
Old 04-11-2013, 08:17 PM   #2
Roofmaster
 
Join Date: Oct 2012
Location: Maryland
Posts: 3,636
Rewards Points: 2,030
Default

venting choice?


Replace with all vented soffit. I have yet to see any cfm data on "smartvent".

I think it is about as "Smart" as the "SmartCar" A combination auto and coffin

on wheels.

__________________
" A lot of men build things, and a lot of things fall down "

jagans is offline   Reply With Quote
Old 04-11-2013, 08:31 PM   #3
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 27,017
Rewards Points: 3,150
Default

venting choice?


How about a picture of the roof so we can see why that would even be an option.
__________________
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
joecaption is online now   Reply With Quote
Old 04-11-2013, 10:38 PM   #4
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Rewards Points: 2,000
Default

venting choice?


9 NFVA per foot or 1/2 of the ridge or correct portion of a 1/150 total system;http://www.dciproducts.com/html/smartvent.htm

Which will prevent ice dams; http://www.brainerdhomeinspection.com/roofve~1.pdf

You would still need to be careful of not blowing cellulose/fg in the baffle space...

The triple 4-center-vent-only punched soffit has 4.78 NFVA per foot (when clean- rarely) which would require a 2' deep soffit and 2 solids or 1' deep soffit and use the basket-weave triple vent; http://bluelinxco.com/Portals/0/docs...20Brochure.pdf They do tend to collect dirt from the moisture in the air that deposits there on the way in. Vents near the house will get moisture from the house as the air washes the siding and goes upward into attic. Optimum location is near the fascia board, pp. 615; http://books.google.com/books?id=Z8a...0vents&f=false

Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 04-12-2013, 07:40 AM   #5
Member
 
Join Date: Apr 2013
Location: Saginaw, Michigan
Posts: 481
Rewards Points: 298
Default

venting choice?


Here's pictures!

So, replace the soffits, or use smartvent? Keep in mind, we are in Michigan, so there's lots of moisture. It took about 25 years for the current soffit vents to clog up with moisture/dust/dirt. Not sure if new vents are any better/worse for this type of condition.
Attached Thumbnails
venting choice?-photo.jpg   venting choice?-photo1.jpg  
taylorjm is offline   Reply With Quote
Old 04-12-2013, 08:28 AM   #6
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 6,637
Rewards Points: 2,556
Default

venting choice?


While the smart vent is an easier system to coordinate from a contracting standpoint because the standard roofing crew can do it in conjunction with the roof and does not require additional set up (i.e. siding pump jacks and access).

That being said, I think the truly vented soffit and properly baffled eave is the right way to go and will function more effectively, look better, and be more permanent.
Windows on Wash is offline   Reply With Quote
The Following 2 Users Say Thank You to Windows on Wash For This Useful Post:
jagans (04-12-2013), joecaption (04-12-2013)
Old 04-12-2013, 12:31 PM   #7
Member
 
Join Date: Apr 2013
Location: Saginaw, Michigan
Posts: 481
Rewards Points: 298
Default

venting choice?


Yeah, that seems to be the dilemma...do you go with the old way, tried and true, replace the soffits...or a new way with the smart vent.... From the way the quotes are coming in, to do the soffits will cost about $1200 more than the smart vent way. Total to fix the ventilation and reroof will be somewhere in the $8,000-11,000. So do you spend the extra $1200 for soffits, or save the money and go with the smartvent?
taylorjm is offline   Reply With Quote
Old 04-12-2013, 02:49 PM   #8
Rubbin walls since'79
 
Brushjockey's Avatar
 
Join Date: Mar 2011
Location: Mn
Posts: 2,518
Rewards Points: 2,000
Default

venting choice?


I'd rip it out and re rock. Then you could add more outlets .
__________________
"It's better to come here with questions before you screw up than to come here after and ask how to fix them."- JS
Brushjockey is offline   Reply With Quote
Old 04-12-2013, 10:52 PM   #9
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Rewards Points: 2,000
Default

venting choice?


IMHO, leave the soffit venting as is, add the smartvent. It would allow drier air coming in from wind blowing at the 3/4" high entrance edge, but not drive much moisture up as the intake sits 6" (after side baffles) above the drip-edge.You would have constant water running down/over during/after a rain... Did you do any other research on the product, as yet? The soffit vents stops most rain from entering but encourages more moisture toward the soffit from all ground wind, forcing it all against the house (picking up more moisture) and depositing it on soffit. Did you research the punched holes (effectiveness) in a soffit?

Either one for looks from the ground. Whether the air is supplied from under or over the soffit is not an issue, IMO. It will find either way easy, if the attic is air-sealed at the thermal/air barrier first. If one is too restrictive, it will draw from the other.

Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 04-13-2013, 12:50 PM   #10
Member
 
Join Date: Apr 2013
Location: Saginaw, Michigan
Posts: 481
Rewards Points: 298
Default

venting choice?


I've researched the smart vent, and it seems to be effective, but I never saw anything about the punched vents on a soffit. My biggest concern is that if I replace the soffit vents, in 20 years they are going to get clogged up again. If it clogged up in 20 years, what's to stop it from clogging up again in another 20?
taylorjm is offline   Reply With Quote
Old 04-13-2013, 11:17 PM   #11
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Rewards Points: 2,000
Default

venting choice?


Are you showing signs of excessive moisture in the attic, warranting to change the ventilation from existing? Mold/mildew on the framing? Ice dams are caused from interior air below warming the roof deck sheathing below; http://www.buildingscience.com/docum...46-dam-ice-dam

Have you air-sealed the attic? http://www.familyhandyman.com/DIY-Pr...s/Step-By-Step

Do you have enough insulation to keep the heat from below reaching the attic? I think we are getting the cart-before-the-horse, here. We need more info... ventilation may not be the problem, or may only add somewhat to the solution, depends...; http://www.jlconline.com/cgi-local/v...170a32100a05c7

Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 04-14-2013, 12:09 PM   #12
Member
 
Join Date: Apr 2013
Location: Saginaw, Michigan
Posts: 481
Rewards Points: 298
Default

venting choice?


No moisture in the attic, but we do have ice dams. I assume thats due to the blocked soffits. There are very few penetrations into the attic except the normal electrical. We currently have about 8-10" of blown in cellulose and once baffles and the ventingn issues are solved we will be adding more blown in.

Mainly i am trying to decide whether to tear out the soffits and add more venting that way or leave them and save $1200 and go with a smart vent product.
taylorjm is offline   Reply With Quote
Old 04-16-2013, 03:57 PM   #13
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Rewards Points: 2,000
Default

venting choice?


The ice dams are caused by the heat from below. Probably warm air rising through the ceiling/wall drywall joint that is only taped, or convective loops in low-density f.g. wall cavities- heating the top plates effectively and minimal insulation on the top-plate due to the sloped roof there. Add some foamboard at the perimeters to stop the ice dams; Fig.1; http://www.extension.umn.edu/distrib...ng/dk1068.html

Foamboard rather than foam/plastic baffle (that insulates (not touching sheeting) rather than conducts heat to the roof, first pic; http://www.buildingscience.com/docum...n-roof-venting

Be safe, check the drywall thickness, framing on-center before loading; https://docs.google.com/viewer?a=v&q...h3VLQNBaXp54rA

Gary

__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
The Following User Says Thank You to Gary in WA For This Useful Post:
Windows on Wash (04-16-2013)
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Venting ponch37300 Plumbing 41 02-23-2013 10:37 PM
Ridge Cap Venting Issues - Poor Ventilation?? askeyb Roofing/Siding 14 02-06-2013 09:47 AM
multiple choice - basement bathroom venting debacle and burps denemante Plumbing 1 11-15-2011 10:50 AM
Venting a sink pump WillK Plumbing 2 12-26-2010 01:21 PM
Gas furnace venting Qs (non high eff) WallyWoggle HVAC 6 12-09-2010 06:41 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.