Roxul and damper question?

[john84]

I am planning to insulate and reinstall my block off plate tomorrow.( hoping to get a new f55 from Preston trading post by mid October) I noticed there is a few different roxul insulations available a few different R values and thicknesses.Is there a certain one that is better for this application?

I have about a 30 foot exterior chimney. I know it might not be needed but I would like to add an inline damper. Is there a Tee available that has a damper built in?

Thanks

 

[begreen]

Usually the batt insulation is what is stuffed above the block-off plate around the liner. In that case 3.5" thick batts are fine. Are you thinking of using Roxul mineral board instead?

 

[john84]

This is what I was looking at,
http://m.lowes.com/search?searchTerm=roxul

 

[cableman]

Last year my buddy picked up the safe and sound roxul, i didnt realize there was other options myself. It worked really well on his install so ill be using the rest of what he has on mine. They dont give an r-value but its gotta have something.
In your case just get the r-15 that should work fine

 

[begreen]

This is what I was looking at,
http://m.lowes.com/search?searchTerm=roxul

The R15 15.25" x 47" batts are fine. You will have a lot left over. The chimney is only going to take a few batts.

 

[john84]

I will pick up some R15 then. About how much should I stuff up in the damper? I am also insulating the liner if that matters

 

[BrotherBart]

You just need to cover the top of the block off plate. You are just trying to keep heat from rising above that. I wish Lowe's would have had the stuff ten years ago. Nobody sold it to consumers back then and I had to find it at a company bankruptcy auction from an in progress building remodel.