Ventilation Advice Anyone? - Roofing/Siding - DIY Home Improvement | DIYChatroom

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


Thread Tools Display Modes
Old 02-08-2011, 11:45 AM   #1
Join Date: Jul 2009
Location: BC, Canada
Posts: 77
Rewards Points: 83

ventilation advice anyone?

first a bit of history...

We live in an area of deep snow and crazy winter temperature fluctuations (northern BC, Canada). We've owned this house for two years and have made significant improvements to sealing the attic/ceiling and improving ventilation. Last year we replaced the roof but I am still seeing some problems that I'd like to fix. I insulated the 2 skylight tunnels to R30, and installed continuous ridge vent, and while we still get ice dams, they are significantly smaller than they were last year. I have included a drawing of the roof design, and showed the four areas where we are still experiencing ice damming.

In areas where there is continuous cold air wash from the soffits to the ridge vent, there is very little ice build up. On the other hand, at the left side of the drawing between the dashed lines, there is no soffit ventilation, and I believe the heat build up and poor circulation in this area is resulting in warmer temperatures. I have two ideas on how this might be solved:

1) install soffit vents from the eaves at the left of the photo up under the dutch gable. This would allow cold air to come up through the soffits and into the attic in an area that is too warm. I am guessing that a baffle of at least 6' would be needed to span the distance from the outside wall to the underside of the dutch gable wall. Are there any reasons I shouldn't do this?

2) remove excess roof sheathing in the attic to improve air circulation between well-vented areas and poorly vented areas. For example, the dashed lines show where the roof sheathing is present in the attic. Openings large enough to walk through were cut in the sheathing in these spots, but there is very little air circulation between the main part of attic and the top and bottom bits at left of the drawing. Is there any harm in cutting away some of this sheathing?

Lastly, there are 4 gable vents left in place at each gable. I've read many discussions on here about whether to leave them or remove them. What do you think?

I appreciate your input, as I've had a difficult time getting a straight answer from those I've talk to where I live.
Attached Thumbnails
ventilation advice anyone?-roof-config.jpg  


longshanks is offline   Reply With Quote
Old 02-08-2011, 05:01 PM   #2
old timer
Join Date: Nov 2008
Location: Northeast Ohio
Posts: 104
Rewards Points: 75

The additional soffit vents and baffles should help.

Leave the gable vents in for better ventilation.


dmc@RCR is offline   Reply With Quote

Thread Tools
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
BAD ADVICE??? You tell me! Bathroom Exhaust Fan Ventilation firefish317 Plumbing 2 04-20-2010 08:23 PM
need some advice on best roof ventilation for this house longshanks Roofing/Siding 9 07-26-2009 06:49 AM
Need Attic ventilation advice beerdog Roofing/Siding 22 12-23-2008 05:27 PM
added metal roof advice on ventilation citadelcadet Roofing/Siding 5 08-20-2008 12:11 PM
Knee wall Ventilation advice needed N8E Roofing/Siding 9 06-28-2008 11:23 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1