How low to insulate liner?

[Ctwoodtick]

For adding insulation wrap to the lower 18 inches of liner that original installer left bare, I’m wondering if it is ok to continue the insulation over the appliance adaptor to maybe a half inch above the insert collar. I’m thinking about doing this to so that the block off plate that will be installed about 5 inches over that does not have to contend with the heat of the bare appliance adaptor directly below. Thoughts?

 

[EatenByLimestone]

What do you fear could happen if you do? And if you don’t?

 

[EatenByLimestone]

What is your heat shield going to be made of?

 

[Ctwoodtick]

What do you fear could happen if you do? And if you don’t?

Good question. Wanted to make sure it wasn’t going to cause a heat issue at the adaptor. Also, with the liner expanding and contracting at a different degree than the adapter, I wanted to make sure the insulation wouldn’t get pulled/damaged because of this. I would be foil taping this low section of the translation to the existing wrap insulation 18 inches up, so don’t want expansion issue to negative effect the existing insulation wrap.
The block off plate will be 26 gauge galvanized sheet metal with roxul directly above.

 

[EatenByLimestone]

Can you find the sheet metal without the galvanization? I know it’s common, but the 400F temp that it starts to have issues is well within the possibilities of what it could see.

I don’t think insulating will be a problem. I think the different materials will move at different rates regardless of if it’s wrapped or not.

 

[stoveliker]

I'd avoid going over the collar if the manual says not to insulate the top of the insert. Other than that I think things don't make a difference.

 

[Ctwoodtick]

OK, thank you for the tips on where to end the insulation wrap.
Yes, I thought about the galvanized steel issue with heat. I’ve read on hear that galvanized is a very commonly used material for the block off plate, but I suppose I could use something else. I know that stainless is an option. Are there any other types of sheet metal that could not face corrosion?

 

[EatenByLimestone]

All metals corrode. When in contact with other substances it can speed up the process. I’ve seen where fasteners can make a difference with corrosion speed.

 

[stoveliker]

As long as it's not touching the liner (because roxul between the plate and the liner), I wouldn't worry. Before the plate corrodes through, it'll be a while.
Make sure the chimney is not leaking in at the crown or the sides.

 

[Ctwoodtick]

As long as it's not touching the liner (because roxul between the plate and the liner), I wouldn't worry. Before the plate corrodes through, it'll be a while.
Make sure the chimney is not leaking in at the crown or the sides.

What are your thoughts on stainless block off?

 

[stoveliker]

If you want to pay, fine.
But thick enough steel not touching the liner is how it's done mostly I believe.
I mean you can spray paint it if you want with stove paint. Your stove isn't stainless either...

 

[Ctwoodtick]

If you want to pay, fine.
But thick enough steel not touching the liner is how it's done mostly I believe.
I mean you can spray paint it if you want with stove paint. Your stove isn't stainless either...

Right, but I was just referring to using stainless, in relation to any possible concerns with galvanized with offgassing that was brought by @EatenByLimestone

 

[stoveliker]

Okay.No, stainless won't have off gassing hazards.