new stove installed - got a problem

[UPswede]

Ahhh. ....and my trim plate is 14" square so....it makes sense. Good to know - hard to hear.

Duravent gives it as 3 in MINIMUM but anyone that exceeded the minimum could not use a trim plate. Am I off on my thinking?

 

[DougA]

I used ICC Excel since I already had the compatible SS sections. The entire section is free of marks so the cover plate can slide on to fit anywhere. Sorry if I misguided you but the specs listed should apply to most adapters I would think.
(broken link removed to http://www.icc-rsf.com/main.php?t=chem_produits&i=6&d=&l=en)

 

[ddahlgren]

Could you just put a square piece of cement board in touch up taping and plaster and call it a day? At that point it is no longer a combustible surface. If there is not enough material to install the way they want and properly trim it off what is if the installer to do? Especially if you provided materials to 'save some money'.

 

[UPswede]

dd,
I think that 's a good idea - something to really consider. I was hoping for a solution easier than a nearly complete reinstallation minus setting the stove and cutting the roof / flashing part. I am not sure if this would fly, but it seems like it would work.

Would this restore it to a safe and clearance to combustibles compliant installation?

 

[ddahlgren]

dd,
I think that 's a good idea - something to really consider. I was hoping for a solution easier than a nearly complete reinstallation minus setting the stove and cutting the roof / flashing part. I am not sure if this would fly, but it seems like it would work.

Would this restore it to a safe and clearance to combustibles compliant installation?

I would think the first thing is to call the company that made the parts and see if a revised part. I would wonder if non combustible or if a certain R value needed. Last I knew cement board is non combustible but there are different levels of that so the instructions poorly done too by not mentioning that or if it has been omitted from the description of the problem.

 

[UPswede]

Their support is pretty good. Let us know what they say.

Called duravent tech support in CA (closed today) and then their tech support number in NY. Left messages at both. NY branch may be closed for holiday as well. Will post what I find out.

I think Webby's idea on how this should have been installed makes sense. Cutout probably should be 12" diameter and the bottom shelf of the upper portion of rcs box set flush with finished ceiling. I would appreciate any opinions/ideas on ddahlgren's idea about replacing the drywall section with cement board.

 

[ddahlgren]

Is this dual wall coming out to the stove or single wall. If single wall does a 1 foot section of dual wall/Duravent plus fix the problem?

 

[UPswede]

It's duravent doublewall

 

[webby3650]

Is this dual wall coming out to the stove or single wall. If single wall does a 1 foot section of dual wall/Duravent plus fix the problem?

Not at all. The drywall and plaster are 2" too close to this box. It really needs to be fixed, although it likely won't cause any problems. But, if there ever was an issue...

 

[UPswede]

Not at all. The drywall and plaster are 2" too close to this box. It really needs to be fixed, although it likely won't cause any problems. But, if there ever was an issue...

So I need to remove the storm collar, disconnect and pull the class A sections, remove the attic insul shield, drop the telescoping dvl and trim plate, remove rcs box, enlarge the hole in the ceiling, lower the support box 0.75 in. .....and then reinstall everything. ....correct?

 

[webby3650]

Unfortunately, yes. Or possibly cut the drywall back and replace it with cement board. Dura-Vent would have the ultimate say.

 

[UPswede]

Ok - I hope to get in contact with duravent Monday. If I need to lower the box I will contact the installer, but if I have to wait as long to get them back as it took to get them here for the initial install I think I might just as well do it myself.
I read somewhere recently that it can be difficult to disconnect/twist the class A sections from each other. Have you found this to be true? Any other advice to make this easier is welcome.

Thanks

 

[webby3650]

They come apart easily.

 

[UPswede]

Made the call to Duravent tech support. Long conversation.... here's the shorter version. The rcs box does need a 3" min. projection into the room (below the finished ceiling). Cutout is about 12.25 " diam., not the 9" I had originally.
Regarding the option of replacing the section of drywall with cement board to achieve clearance to combustibles, she (tech) said the plan should be submitted to the NFPA for approval. Also, a sketch and explanation could be emailed to Duravent for an opinion.

Pic is how it should look and ....how it does look NOW

Hearth.com is an exceptionally well-run resource for information and advice. Thank you to everyone that makes the effort to help with such knowledge, patience, and understanding.

 

[begreen]

Thanks for the update. It would be great for DuraVent to document this more precisely.

 

[webby3650]

Thanks for the update. It would be great for DuraVent to document this more precisely.

I really feel like their documentation and specifications are outlined pretty well. A qualified installer or competent DIYer shouldn't have much trouble. Every 6" ceiling support box I've done requires a 12" cutout minimum. Maybe it was their first?

 

[UPswede]

I think it was their first install using the round support box. They use the square box routinely. I got the impression they weren't into reading any installation guides, so it probably didn't matter how precisely it was written for this install.

 

[webby3650]

I think it was their first install using the round support box. They use the square box routinely. I got the impression they weren't into reading any installation guides, so it probably didn't matter how precisely it was written for this install.

We also use the square box most of the time. It always works, the round box can't be used in some situations.

 

[ddahlgren]

Who fixed it you or the installer?

 

[UPswede]

I was looking at it Sat. morning while having my first cup of coffee and decided I wanted it done according to the install guidelines and I was tired of waiting for anyone else to do it. It also gave me the opportunity to put the required (specified in install guidelines) number of screws in the framing box, AIS, and support box. I took my time and it was done by late afternoon.

The help I received here just clarified what I had suspected and now when I go to bed at night with a fire going I won' t have that concern to think about. Thanks