Thimble

ejm77 · Post by **ejm77** » Sun. Nov. 30, 2014 9:27 am

This is my first post but I have been a long time lurker on this forum and have learned so much. Great forum. I decided to go with a Leisure Line Pioneer stoker but was originally planning on a power vent. After much research on this site I decided to go with a masonry chimney which is currently being built. My question is what material can I put around the clay thimble that is passing thru a combustible wall? I know it can be bricked in but I'd prefer to just use some sort of insulation if I can. I've read that rock wool can be used. Any suggestions?

waldo lemieux · Post by **waldo lemieux** » Sun. Nov. 30, 2014 9:42 am

type x sheetrock cut to within 1/4 inch ,and fire caulk. you can use Roxul insulation behind the sheetrock . If you use metal furring you can attach it right to the block.

ejm77 · Post by **ejm77** » Sun. Nov. 30, 2014 9:51 am

Waldo, thanks for the reply. What can I use to cover it on the outside?

waldo lemieux · Post by **waldo lemieux** » Sun. Nov. 30, 2014 11:12 am

Are you going to put the stove right in front? If so , any brick or stone , metal , tile. use your imagination

Read the stove instructions for clearance to combustibles.

ejm77 · Post by **ejm77** » Sun. Nov. 30, 2014 1:20 pm

I'm talking about the outside of the house. What non combustible material can I use around the thimble to cover everything up?

whistlenut · Post by **whistlenut** » Sun. Nov. 30, 2014 1:32 pm

Is the thimble passage not going directly into the masonry chimney? I am confused I guess. Normally the transition from inside to outside is also masonry, and the area around the flue would be brick or some form of fireproof material. if you could explain further, that would help......

coalder · Post by **coalder** » Sun. Nov. 30, 2014 2:04 pm

Whistlenut, Don't feel too bad; Been doing this for 40 yrs and I'm just as confused as you.
Jim

waldo lemieux · Post by **waldo lemieux** » Sun. Nov. 30, 2014 2:24 pm

Are you saying that there is a gap between the house and the chimney? If so it shouldnt be but a inch or so and you don't need anything . Take a pic and post it......

waldo

ejm77 · Post by **ejm77** » Sun. Nov. 30, 2014 2:38 pm

Thimble will pass thru the wall into the chimney. I would rather not brick around it if I don't have to. Waldo recommended Roxul insulation inside the wall around the thimble and type x sheetrock for inside wall cover. The vinyl siding was removed from outside of house to make a framed opening for thimble. Can I just put the vinyl back on or do I need to use a non combustible material? There is a 2 inch gap between chimney and house as per local codes.

coalder · Post by **coalder** » Sun. Nov. 30, 2014 3:38 pm

Ok, when the thimble passes through framing, you must brick around it. How far around it is per local codes. Usually 8 inches. Cosmetically you can usually get a shroud to cover it. As per masonry clearance to framing, outside usually 1 inch, and interior 2 inch. Hope this helps.
Jim