This may sound like a stupid question, but here it goes. I built a covered deck/veranda that was 14 x 36 on the back of the house. The deck is roofed with 25 year asphalt shingles and directly under the rafters (Vaulted) I have installed 1×6 beaded soffit boards. The inspector suggested that I drill 1″ vents between the rafters at the top to allow for cross ventilation but the roof has no vents. Do I need roof vents? He didn’t specify anything on the roof vents but what is the purpose of the holes if the air has no where to go. And you would think that there is enough “gaps” between the 1×6 T&G soffit for any hot air to get out. The deck isn’t enclosed, it is complete open air. What is your opinion. Plus, should I then install screened bird blocks???
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It's not over conditioned space so it doesn't have to be vented for moisture condensation.
On the other hand shingles last longer with less heat buildup.
Beer was created so carpenters wouldn't rule the world.
Your inspector has no clue.
If you passed, leave it.
a 1" hole isn't gonna pass enough gas to change the temp 1º.
Joe H
The only reason you need venting is for "opportunistic" moisture -- windblown rain, etc. It might be worth inserting plug-style vents high (at peak) and low (near eaves) to take care of that, if the "ceiling" were solid (plywood/drywall). But the gaps in the T&G likely provide enough ventillation for this, as you suggest.
I would not bother drilling holes.
But if you do you can pick the birds you want to nest in there by the hole size!!
That's why I'd use the plug vents. They come in sizes from about 1/2" to about 5", designed to friction fit a drilled hole.
People never lie so much as before an election, during a war, or after a hunt. --Otto von Bismarck
1st, if you asking about code, we don't know what the codes are where you live... I don't even think we know where you live. That said, here, open porches, etc don't need attic ventilation - per our modified IRC2000 code. It's not a bad practice though as you don't want dead air spaces (in your case, between the ceiling and the roof sheathing. I don't think the 1" holes will do squat though. If you wanted to vent, assuming a shed style roof that butts into the wall of the main house, you can take regular ridge vent, and cut it in half the long way, and install this at the intersection of the wall/porch roof, and then flash normally. If you are interested, I'll get you a pic. You would need some kind of intake vents at the soffit too - or maybe you feel the cracks between the T&G 1x6 will provide the intake... Is it painted, stained, or what? Even though the T&G was undoubtedly kiln dried lumber, it will probably dry out and shrink even more... producing larger gaps.
OTOH, if the inspector passed your project, and you hadn't planned on doing it, and don't want to, I wouldn't loose too much sleep over it.
No way i would bother venting this space.
Matt has an interesting suggestion if you do. i have seen manufacturers suggestions on exactly how to do this--but I would reccomend AGAINST doing it that way.
when i learn how to post pictures here i am going to post pictures of a large building vented this way---and explain what went wrong when that was done.( new multi million dollar church BTW.)
Stephen
if this is an open porch, it is crazy to ventilate it.
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