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Old 08-28-2012, 11:10 PM   #16
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Bathroom exhaust through roof


The box stores sell the square static vents with a 4" pipe adapter on them for bath exhaust easy-hook-up; http://www.airvent.com/homeowner/pro...fLouvers.shtml
(though it appears they ducted a fan to a roof exhaust, probably with no adapter. Picture from inside the attic would clarify... EDIT: The conversion adapter is no longer carried at the box stores. Turned a box vent in to an exhaust vent with a snap-in pipe/lid.
I do agree you need the 50sq.in. NFVA turtle-back vents as you pictured every 3' apart on the roof for 1/300 venting at exhaust. Is there a poly plastic under the attic insulation?

Could you send us a picture of the intake vents at the soffit?

Gary

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Last edited by Gary in WA; 09-01-2012 at 10:05 PM. Reason: Added up-dated clarification.
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Old 08-29-2012, 08:10 AM   #17
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Bathroom exhaust through roof


I have removed many roofs with a static vent used as a bath/stove exhaust as opposed to a bath/stove "flapper vent" designed for said purpose.

The big issue with that is without that stem to hook up your ducting to, the steam/moisture can/will rot the wood around the vent.
If you don't feel comfortable getting up there and removing shingles, then call a roofer.
It's a 10 minute fix but you should remove a couple shingles to install the flapper vent without tearing shingles.

And as for your venting, I would install more vents along the entire ridge.
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Old 08-29-2012, 05:58 PM   #18
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Bathroom exhaust through roof


Thanks again for the answers! I will input some info here and more photos. I am sorry if the photos aren't the best. The attic is very dark. By the way, the insulation is for the most parts fiberglass insulation (loose gray stuff).

First, my attic has 2 parts. It is shaped kinda like this

--------|___

So there is a lower part and then there is a higher part. The lower part is the part that sits on top of the family/dining room that are downstairs. These rooms have 10 feet ceilings. The higher part of the attic sits on top of the bedrooms that are upstairs.

I took the temperature while I was up there taking pictures. The outside temperature is 75 (cloudy) and the attic temp. was in the middle of the attic close to the top of the roof 82.4.

When I open the door to the attic I see a film attached to the edge of the door (picture http://i1061.photobucket.com/albums/...e/a1aa2db7.jpg) and it goes under the insulation in the lower section of the attic (living/dining) so I assume there is a poly plastic film under the lower section insulation. However, when I get to the higher part of the attic (bedrooms) I don't see any plastic under the insulation, if I push it aside there is only wood underneath.

Ok. To the rest of the pictures.

These are what the vents look like (both ends of the roof)
http://i1061.photobucket.com/albums/...e/90bc154b.jpg

Here are pictures of the soffits
http://i1061.photobucket.com/albums/...e/eedadc66.jpg
http://i1061.photobucket.com/albums/...e/48155805.jpg
http://i1061.photobucket.com/albums/...e/1787d48b.jpg

Here are pictures of the duct work
This first one is a picture of one of the ducts that is hooked up to the actual exhaust vent. (I think this is the one for the dryer)
http://i1061.photobucket.com/albums/...e/69996f0c.jpg

This is the picture of the hook up of the shower vent that I believe is attached to the static attic vent. Looks a lot different compared to the previous one.
http://i1061.photobucket.com/albums/...e/f90b92b9.jpg

Maybe the forged some sort of a makeshift adapter??

I think I might have to call a roofer on this one since I don't think I can handle it myself. I worry about the cost though... I just dumped most of my money into the crawlspace. The drainage was done wrong & the sump pump basin was was too narrow for the water level pulley thing to work so the water didn't get into the sump pump at all and whatever little did it just sat there.

Any idea what would it cost to add a few more of the turtle back vents and have the shower vent switched to proper exhaust vent? BTW the shower in question (downstairs bath) is in use at the moment while I figure out how to install a shower door to the master bath shower but once the shower door in the masterbath is in place this wrongly vented shower downstairs in only going to be used when I have guests so perhaps 20 days out of a year. At some point I have to figure out whether I just leave it be and have food to eat or get it done and eat crackers for the next month. LOL.

Thanks, this has been very enlightening already!!
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Old 08-29-2012, 06:13 PM   #19
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Bathroom exhaust through roof


Quote:
Originally Posted by Dugams View Post
First, my attic has 2 parts. It is shaped kinda like this
--------|___
Have no idea what the dashed lines, the vertical line then the solid horizontal line mean.

Quote:
Originally Posted by Dugams View Post
Any idea what would it cost to add a few more of the turtle back vents and have the shower vent switched to proper exhaust vent?
Between $100 and $2000
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Old 08-29-2012, 06:16 PM   #20
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Bathroom exhaust through roof


The lines are just to show the shape of the attic flooring. Left side of the attic floor is higher than the right side. Did the best I could with the keyboard keys. The dashed line is really a solid floor and then the vertical line shows where the higher floor drops down to the lower floor.

Last edited by Dugams; 08-29-2012 at 06:20 PM.
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Old 08-29-2012, 06:31 PM   #21
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Bathroom exhaust through roof


Just thought about something... the house used to have a cedar shake roof. It was re-roofed using shingles about a year ago. I wonder if the roofers did this fancy connection or if they just hooked everything back up the way the builder had done it. Hmm.
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Old 08-29-2012, 07:08 PM   #22
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Bathroom exhaust through roof


Is there any way you can vent the shower out a side wall a close to the shower as possible vs the roof?

Did you say there was a dryer vent exhausting through the roof too?
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Old 08-29-2012, 07:20 PM   #23
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Bathroom exhaust through roof


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Originally Posted by roofnron View Post
Is there any way you can vent the shower out a side wall a close to the shower as possible vs the roof?

Did you say there was a dryer vent exhausting through the roof too?
Yes, there is a dryer vent exhausting through the roof. I am not sure if it is possible to vent the shower outside the wall since the shower is wedged between the laundry room and an office. And the back wall is to the garage. So there is no outside wall anywhere too near.
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Old 08-29-2012, 09:20 PM   #24
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Bathroom exhaust through roof


This may not be possible but I think the best answer is not to exhaust the shower or dryer through the roof. You would be much better to turn and install these out the nearest sidewall. It is much easier for the air to force the dampers open if they are vertical. The condensation that forms on the dampers will drip outside rather than back down the pipes. If they must be in the attic the pipes should insulated all the way to the deck.

As far as dryer goes, is there anyway to change this so that the pipe runs out the closest sidewall, even if you had to go down through the basement or crawlspace, instead of up 20+ feet vertically into the attic. The least amount of pipe and elbows the better. This is a safety issue. Your dryer will have specs on this for maximum distance and elbows.


As far as ventilation goes your roof is a mess, but at least you have some. It looks like those are about 2" circle vents. 3 of them in a 2 foot bay. 1.5 sq inches NFA per hole. If each static vent was 50 sq inches of exhaust you would need 34 of the drilled holes to support 1 static vent. Without knowing all the details I am thinking you are short on intake. You have 5 static vents, looks like a power fan, 2 gable end vents. I don't see the exhaust side of the equation being the problem, (although mixing vent types like this is bad form.)

Another way to look at is we should try to install enough intake to support ridge vents if and when they are installed. Ridge vents are typically figured at 18 sq inches per foot. That means we need 9+ sq inches per foot at soffits to support them. Your house has 3.5 sq inches per 2 foot or 1.75 sq inches per foot. So if you spend any money on vents do it at the soffits, not but adding more exhaust vents on the roof.
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Old 08-29-2012, 09:41 PM   #25
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Bathroom exhaust through roof


Sorry, I wasnt very clear. The dryer actually does vent through a side wall, the laundry room has an additional ceiling exhaust fan that goes up to the attic and thru the roof. Also, I wasnt very clear about the small 2" intake vents. They are all over the bottom of the attic, total number of them being around 80.
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Old 08-29-2012, 10:53 PM   #26
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Bathroom exhaust through roof


Would it be up to code to run the bathroom duct thru the garage and out of the garage wall to outside?
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Old 08-30-2012, 07:32 AM   #27
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Bathroom exhaust through roof


The problem with "direct venting" (out the sidewall, usually for this the bathroom is on the side of the house) of you bathroom shower is, they usually use an accordion type ducting tube with ridges (some will use metal ducting) and water/moisture builds up in those ridges, and in the winter it freezes. Causing other issues like mold.
I definitely would not run it along your garage then out the side wall, too far to go. If your bathroom is on the side wall of your house, then it would only be a few feet to the exit, so not a huge deal.
I had to move 35 (townhouses in a real cold (-20C) and snowy area) of these bathroom exhaust vents from a direct vent to a roof top vent for this reason alone.

There is nothing wrong with a bath exhaust exiting your roof, as long as the proper parts are used and installed properly.

Cost is dependent on who you hire, some companies like to soak people on these sorts of things, some are decent folk who charge a decent fee for an hours work (attic vents and shower vent).
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Old 08-30-2012, 11:34 AM   #28
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Bathroom exhaust through roof


Yeah there is no outside wall directly next to the bathroom in question. It is wedged between garage, laundry room, living room and office. Thanks for the info on the pricing. I should be able to handle that!
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Old 09-01-2012, 02:51 PM   #29
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Bathroom exhaust through roof


I think you may be worrying about this more than you have to.

Take a look at this product: http://dl.dropbox.com/u/1580852/ALL_...structions.pdf

As you can see, it is very similar to the adapter that you currently have in your attic. As the instructions say, you can mount it from either outside or the inside (as your's is mounted). This product is listed for any of the dozens of Lomanco box vents and I'm sure it will work with just about any manufacturer's vent of similar size and design.

You are already in much better shape than the millions of people who have their bathroom fans vented into the attic space instead of vented outside. I dont think you have to worry about your installation.

One thing that you can do to help with this issue and a few others is to install a timer on the fan and have it run the fan for 10-15 minutes after your shower. This will dry out any condensation in the duct or vent.


Last edited by NECHater; 09-01-2012 at 02:57 PM.
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