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Vikeologist 11-08-2009 10:46 AM

Bathroom Remodel Questions
This could get lengthy, I'll try to be as clear as possible.

I am going to completely remodel my bathroom. I am ripping everything out to the studs.

In the attic there is blown in insulation, but no vapor barrier. When I tear down the drywall, the blown in insulation will fall through into the bathroom. Do I go up into the attic, move the insulation away from the bathroom, and tear down the drywall, put up a plastic vapor barrier, hang the new drywall, then go into the attic and move the insulation back?

I will also be installing a fan in the ceiling. Do I install the fan directly over the shower/tub, or do I install it in the center of the room? Also, do you cover the fan up with insulation in the attic, or keep the insulation away from it? Is a Broan 150 CFM/1.5 Sones a good one?

The tub I am getting will have a wall surround. Do i use water resistant dry wall just around the surround/tub area, or do I use green drywall throughout the entire bathroom? Do you install the surround right over the studs, or do you put drywall behind, then install the surround on top of that?

Do I put a plastic vapor barrier on all of the walls of the bathroom or just the exterior wall and the walls behind the tub/surround?

I think this is all the questions I have for now, but I'm sure I will have more soon. lol! Thanks a bunch!

Bob Mariani 11-08-2009 10:52 AM

Either move the insulation or let it fall with the drywall and replace it. Your choice. No greenboard... was used years ago and was found to be useless. Use mold free drywall everywhere. This fan is a basic fan. Something like fantec will be much much better. a good fan is critical. Place it on a timer which starts when the light is used so the fan always gets used. Do not place it over the shower. A covered recessed light can be used over the shower. Not sure where and why you intend to use plastic. Kraft faced insulation is fine.

Vikeologist 11-08-2009 12:42 PM

where do I buy fantech fans? i am doing the bulk of my purchases at Lowe's...

I live in Minnesota, and we have extremely cold winters here, so I was told I needed a plastic vapor barrier on the outside walls

Bob Mariani 11-08-2009 03:43 PM

in that climate you are correct... use the plastic on the outside walls. Lowes can order these fans for you or order them online. You will not even hear them at all and they will pull twice the moisture out then the Broan models.

Vikeologist 11-08-2009 04:12 PM

where would I order them online. I am going to Lowe's tonight, which one would you recommend for an average sized bathroom...

also, where should I install it? in the center of the room?

Bob Mariani 11-08-2009 05:53 PM

install between the toilet and the shower/tub. Just search for Fantec. you will find many good suppliers. the fan is installed in the attic inline with the ducting. Only a intake louver goes in the bath ceiling.

Vikeologist 11-10-2009 07:31 AM

Well I went ahead and ordered a Broan 150 CFM Bath is the link to it. actio...236-14-QTXE150

I hope I made an OK choice. I live in the middle of nowhere and the nearest distributor of Fantech fans was 3 hours away. Will I be ok with this fan? My bathroom is 10x10

Bob Mariani 11-10-2009 08:13 AM

it will work fine.

Vikeologist 11-10-2009 10:55 AM

do you cover the fan unit in the attic with insulation? is it ok to completely cover it up after installation, or do you leave it uncovered? I am going to be using insulation flexible duct to the roof.

Also, can you go straight up from the fan, or should i run the duct straight for a few feet before going up to the roof?

Do you just lay the fexible duct on the ceiling drywall or do you fasten it to the ceiling joists somehow?

sorry for all of the stupid questions.

Bob Mariani 11-10-2009 11:14 AM

all good questions and you may find many different answers. I use flex duct about 2' laid flat in the ceiling. This keeps the run from being straight out in case of minor water drops entering from above. Then I transition to 4" metal with a 90 ell and go straight up thru the roof. You can insulate completely around the fan.

Vikeologist 11-10-2009 12:34 PM

Can I use the flex duct all the way to the roof opening? Can i just run the flex duct about 2 feet, then make a gradual turn up towards the roof?

I got some radiator type clamps to connect the flex duct to the fan, and to the roof, will this work? How can I be sure that the duct stays connected to the roof?

Bob Mariani 11-10-2009 12:38 PM

yes you can do it that way. Flex duct has more drag, but as long as the run is short (less than 12') you will be fine.

Vikeologist 11-12-2009 06:37 AM

OK, thanks for all the help so far, but I have some more questions....

The tub surround that I bought says to install the surround directly over the studs. I was told by a couple of people to not install it over the studs, but instead put cement board behind it, then install the surround over that. How do you match up the top drywall that butts up to the surround?

Also, what kind of drywall should I use in the bathroom? Should I use all green drywall, or just regular drywall?

When installing drywall, how far off the floor do you keep it? I will be puting new plywood on the floor, then a cement backer board, then ceramic tile.

Do you put the cement board under the tub and vanity as well, or tile up to the vanity and tub?

Bob Mariani 11-12-2009 06:49 AM

to drywall at top question: This depends on your surround. If it says to mount directly on the studs then do so. This would mean the to top is built in such a way the drywall will sit above it. Just caulk this seam.

I would put the CBU on the entire floor (not under the tub) as well as the tile. Then set the vanity. Now it is easier to change this latter if needed and the height remains correct.

Do not use green board. Use mold free (paperless) drywall in the entire bathroom. Use Zinsser's perma white paint for primer and top coats which adds mildicide to prevent any mold.

Drywall should be kept off the floor. I keep it up 1". This prevents any water from wicking up the sheet.

Vikeologist 11-12-2009 08:01 AM

Should the drywall be 1" above where the tile will be, or one inch above the plywood floor?

Do you put the drywall up, then the cement board, and tile last?

so just put the cement board right up to the tub, or leave a space? same with the tile?

and yes the surround has a lip so the drywall sits right on top of it. do you leave a little gap, or sit it right on the surround?


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