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kyphysics
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I'm wondering if attics supposedly have air vents to let air flow in and out, how is it that these "holes" in the attic also don't let water come through during rain?
anorlunda said:Pictures are worth a thousand words.
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There are many more variants.
So you are asking for unprotected vent pipes protruding out of the roof? I'd guess that their j-traps keep water from backing up, but I don't know that for sure. I'll Google a bit more...Klystron said:Vertical vents commonly use pipes through the roof.
You just gave me serious vertigo, and my stomach contents are now cleared. Thank you very much.Klystron said:but I like your spinning cap shown in your first post.
Ah, I understand how the unprotected vent pipes drain now. They drain out of the overall house drains...berkeman said:So you are asking for unprotected vent pipes protruding out of the roof? I'd guess that their j-traps keep water from backing up, but I don't know that for sure. I'll Google a bit more...
https://i.pinimg.com/originals/0d/72/41/0d7241ce5b63f17b835e6eeb1b971988.jpg
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Most building codes require an insect screen behind the louvers and any other path into the attic.kyphysics said:Pics are very helpful.
I see more of the "vertical" vents in my neighborhood. Always wondered how they worked. Figured if you had a hole, "stuff" could come in (bugs or water). Thanks for the pics and explanations!
Depending on type of house your talking about (gable/hip) there are 2 basic types of intake flow vents (gable vent / Soffit vent) respectively. House that have gables usual don’t have as many exhaust flow vents due to flow ability and how wind can drive thru attic. There is a specific formula based upon surface area of roof : area of house footprint that calculates needed intake surface area and proper exhaust flow depending on vent type. But as long as your shingles (laminated) don’t look like burnt toast intake/ exhaust ratio isn’t damaging shingleskyphysics said:I'm wondering if attics supposedly have air vents to let air flow in and out, how is it that these "holes" in the attic also don't let water come through during rain?
or vent for a gas appliance,Averagesupernova said:The verticle pipes sticking out the roof have nothing to do with ventilating the attic. They are sewer vents.
I referred to the pic in post #6. 'Nuf said I think.Rolacycle said:If you post picture of exactly what you what identified I’ll answer with the exact answer
Is that what he was referring to because that’s not clear from anything I read?Averagesupernova said:I referred to the pic in post #6. 'Nuf said I think.
Ahhh well those are definitely pvc (1-1/2” ; 2” ; 3” ;4” etc.. ) vents that supply sewer drain air relief for anything that drains to city connected water supply in #6 comment rightAveragesupernova said:Someone has deleted their post. I thought they were referring to the pipe in post #6. So, this is what my replies were aimed at. I have to assume who delete and dash poster was figured out they were wrong. Chicken way out if I've ever seen it.
Attic vents allow for proper airflow in the attic space, which helps regulate temperature and moisture levels. This can prevent damage to the roof and insulation, and also improve energy efficiency.
A general rule of thumb is to have at least 1 square foot of ventilation for every 150 square feet of attic space. However, it is best to consult with a professional to determine the specific ventilation needs for your attic.
Yes, having too much ventilation can actually be counterproductive. It can disrupt the natural airflow and cause air to enter and exit the attic at the same time, reducing its effectiveness. It is important to have a balanced ventilation system.
While it is possible to install attic vents yourself, it is recommended to hire a professional. Improper installation can lead to leaks, which can cause damage to the roof and compromise the effectiveness of the ventilation system.
No, attic vents should not be covered in the winter. They are designed to allow for proper airflow year-round, which is important for regulating temperature and moisture levels in the attic space.