Cathedral roof, insulation, venting, VB
In the MBR I have a cathedral ceiling, shed roof. The high side side is clerestory wall.
The plans show 2×6 ceiling joist and FG (R-17?, this was 30 years ago) bats. And if it was built like the rest of the ceilings. There is poly under the DW and currently there are ZERO penetrations in ceiling. Lighting is indirect with up lights in the clerestory wall and bounce off the ceiling.
Standard metal vents (6×12) are install in the soffit on all of the house. 2 of them land in this part of the roof. There is no venting on the high side.
Based on some of the other details in the house I doubt that there was any attention paid to cross venting the bays as the vents only hit in a few bays and I don’t know if the soffit is open enough.
In any case there have not been any sign of moisture problems in that area, or any visable in the attic over the other parts of house. And that roof continues and forms one side of a gable roof. And whenever there is snow or frost on the roof you can not tell by watching the melting which is which.
(BTW, I am in the Kansas City area and ice damming is just not a problem.)
Any way I want to install a ceiling fan. And with the raking light on that ceiling the only way to do anything that opens up that ceiling would be to do a complete skim coat after making the repairs.
Now I think that I can fish wire from where I want to put the ceiling box to the high side and by removing the fascia board run the wire to a place where I can then drop it down into the attic.
Now my original idea was to cut open the roof where I wanted to put the box and when I am done foam it in place so that there is a complete air an vapor seal.
And do that immediately (with in 1-3 days) before it gets a new roof so that I don’t have to worry about temporary patching lasting. But now that is not going to happen.
That side of the roof is about 8/12 which I am not real comfortable on even in the best of circumstances.
So I though what about doing it all from the inside. Using an old work fan box is not problem. But concerned about that being a path for air and moisture. So I am wondering if you think that I could get good enough seal by running the foam around the gap between the box and the DW and through any unused holes in the box?
William the Geezer, the sequel to Billy the Kid – Shoe
Replies
Bill -
We've done similar stuff w/o a re-roof. Gently pull a few shingles where you want your box, cut a hole in the sheathing and install your box. You might be able to fish your wire from there to the soffit as well.
When you're done, screw some 1x or plywood strips below the sheathing hole, drop your cut piece back in, screw it, re-felt, and put the shingles back in. Caulk them back together.
http://www.quittintime.com/ View Image
Well the shingles are 30 YO and hail damaged. There is no GENTLY removing them.So I wanted to put some patches that I only needed to worry about for a couple of days, not a couple of months.And also with that slope I will need to nail on some cleats or brackets. I only need to go up about 6 ft on that part and if it was only for a couple of days I would just nail some 2x4's and leave them in place. But longer I would need to get roof jacks and board.Now I know that 8/12 is not that steep for roofers, but it is too me<G>. And right now, until I get fixed, I want to be able to lay on the roof and rest if I need to.Thus I want to do it from the inside. Using the expanding ceiling box brackets I have no concern about doing from the mechanical or electrical point of view.Just concerned about putting a hole through the ceiling that will allow moisture to flow into a less than maximumly vented area..
William the Geezer, the sequel to Billy the Kid - Shoe
Bill, if you can cut a 2½-3"-dia. hole in the gyprock without piercing the VB, then snake the wire between the VB and the DW, you could surface- mount a 4"-round box right onto the ceiling. Over that you could then build a 10x10 wooden drop-box--say 8-10" deep on the high side--with a level bottom, and bolt the fan mount to that.
I tried to post an ACAD sketch with this but Mzinga's software doesn't recognise the DWF format. Sorry.
Anyway, I don't know if that meets electrical code in your area but you're the 'code king' around here so I'll bet you do. This kind of drop-mounting is fairly common practice in my area both for fans and for pot-spots; we have a lot of chalets up here with cathedral ceilings.
Dinosaur
How now, Mighty Sauron, that thou art not brought
low by this? For thine evil pales before that which
foolish men call Justice....
There is no way that I think that you could fish through a hole and up 7 ft of ceiling with out tearing it.Actually now that you mention it there might be a slight chance. I would run a fish tape up from the hole to the high side. Then pull the tape back with wire. But I need to open the high side and see exactly what it looks like.But I could punch through a 1-2" hole and through the VB and run it across the top, against the sheathing, which was my like my orginal plan. And with just 1-2" hole where the wire sticks out I can foam hole afterwards.While builting the box will work, I don't particular care for it. If I do that the hole will have to be near the joist so that I can get some mounting screws through the top of the box into the joist. But if I can get the hole next to the joist then I can use a pancake box like this.http://www.aifittings.com/whnew51.htmNow that is suppose to mount solidly against the joist, but I think that through DW will be OK. If it does not seem solid enough I can carve out the DW without damaging the VB.Whether it is surface mounted on the DW or the the DW is roughly carved out the fan canape will cover it. And if it stands 1/2 off the ceiling behind fan blades no one will notice it.This is the what I was originally thinking about. Punch through a hole the size of a box and installing one of these.http://www.aifittings.com/whnew88.htmThen see if I could foam around the edges enough to seal it..
William the Geezer, the sequel to Billy the Kid - Shoe
can't you save the dwf in a pdf format?... not a lot of things will open a dwfhttp://www.tvwsolar.com
Now I wish I could give Brother Bill his great thrill
I would set him in chains at the top of the hill
Then send out for some pillars and Cecil B. DeMille
He could die happily ever after"
Any ordinary web browser should open a dwf. That's what the Drawing Web Format was designed to do--to eliminate the need for the client to have a dedicated viewer program (like VOLOVIEW or VV-Express). IE opens DWFs for sure; I'd be surprised if most of the others PC browsers out there won't. I don't understand why Mzinga won't recognise them....
I don't have Acrobat so I can't create PDFs except using software with dedicated PDF exporting...and my Autocad certainly doesn't have that. I could convert the file to a jpg, but I know from experience it would turn out looking like a plate of muddy spaghetti....
In any event, Bill figured out what I was talking about from my word-picture....
Dinosaur
How now, Mighty Sauron, that thou art not broughtlow by this? For thine evil pales before that whichfoolish men call Justice....
I understand what you where saying so no need to post it.But FWIW you can get free PDF "converters". They install a "printer" and when you select that printer and print to it it outputs PDF.I think that PDF955 is one..
William the Geezer, the sequel to Billy the Kid - Shoe
Thanks, I'll check it out. I won't buy anything from Macromedia but if someone has done an end-run around them, more power to them.
I installed the free 'demo' version of Acrobat a few years back, but didn't really see the need for it so abandoned it after the 30-day trial period. And tried to 'uninstall' it. Hah.
Hah, hah, hah.
Friggin' Macromedia had hidden a 'reminder' pop-up in the demo disc that jumped up in my face every time I tried to use the computer, starting at day 31. And they refused to tell me how to get rid of it, and they also refused to tell me how to uninstall the demo or remove the block on my own Acrobat Reader program which the demo had placed in my machine. Said I had to buy their program to get rid of the popup.
Once that demo expired, I was unable to open any PDF, plus I had their stupid ad popping up and annoying the bleedin' hell outta me. Took me two months and a lotta help from a certifiable computer genius to finally track those applets down and get rid of all traces of them....
Dinosaur
How now, Mighty Sauron, that thou art not broughtlow by this? For thine evil pales before that whichfoolish men call Justice....