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Old 07-31-2017, 11:12 AM   #16
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Re: Attic ventilation


I left my plywood in place and drilled two 2" holes for each rafter bay and then cut between each pair making an elongated hole but leaving the plywood in place. Mine was covered with a continuous 3" vent strip where yours will have the vinyl panels. Should be fine.

Next is to determine if there is an air channel above the plywood and to add vent chutes above the insulation.

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Old 07-31-2017, 01:03 PM   #17
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Re: Attic ventilation


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Just a few good sized hole in the plywood would do it. As long as it is a common area below the tails of the rafters. When we build houses really close together, all the venting is supplied from the front and back of the house and the soffets are just like yours.
So does that roof wrap around the front and back where you might find vents? Often it is just a little skirt roof.

Not sure what you mean by the "skirt roof" part. The back of the house (north side), which is in the first picture of my other post, is the only "flat" soffit overhang on this end of the house (west end).

Here's a pic (sorry for low quality) of the front elevation of the house, and a basic (crappy) MS paint drawing of the bird's eye/top view of the house. The sloped overhang on the gable end in the pic has soffit panels that can be replaced with vented panels. Basically just like the pic in my prior post of the gable end with the octagonal vent. So I have the flat section in the back and the two sloped overhangs on the gables that I could vent.

The overhead view sort of shows what I'm working with. The whole center section of the house is a great room with a vaulted ceiling so there is no attic above it. So we have accessible space over the bedrooms and again over the garage.

If it helps, we have a truss roof and if the section over the finished space is like the space over the garage, the attic space is open to the space in the overhangs. I know this because last time I was looking in the attic over the garage, I could see a little daylight coming in from the overhang areas.
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Attic ventilation-front-view.jpg   Attic ventilation-top-view.jpg  

Last edited by ksguy; 07-31-2017 at 01:04 PM. Reason: Changed photo reference
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Old 07-31-2017, 01:15 PM   #18
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Re: Attic ventilation


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Originally Posted by ksguy View Post
Not sure what you mean by the "skirt roof" part. The back of the house (north side), which is in the first picture of my other post, is the only "flat" soffit overhang on this end of the house (west end).

Here's a pic (sorry for low quality) of the front elevation of the house, and a basic (crappy) MS paint drawing of the bird's eye/top view of the house. The sloped overhang on the gable end in the pic has soffit panels that can be replaced with vented panels. Basically just like the pic in my prior post of the gable end with the octagonal vent. So I have the flat section in the back and the two sloped overhangs on the gables that I could vent.

The overhead view sort of shows what I'm working with. The whole center section of the house is a great room with a vaulted ceiling so there is no attic above it. So we have accessible space over the bedrooms and again over the garage.

If it helps, we have a truss roof and if the section over the finished space is like the space over the garage, the attic space is open to the space in the overhangs. I know this because last time I was looking in the attic over the garage, I could see a little daylight coming in from the overhang areas.
If you had it you would have understood.
If the vaulted ceiling was trusses, there should be room above the insulation for air.

If when you cut into the plywood you find you have a common space in there
I would just cut something like 1 sq. ft every 10 ft or so and just cover those areas with vented soffet.
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Old 08-01-2017, 02:24 PM   #19
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Re: Attic ventilation


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If when you cut into the plywood you find you have a common space in there I would just cut something like 1 sq. ft every 10 ft or so and just cover those areas with vented soffet.
I like the sound of this. I'd much prefer to only add a 6-8 vents instead of pulling out and replacing all of the soffit panels. Here's hoping for common space up there. I should be able to check tonight.
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