Wall thimble issue

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jdempsey

Feeling the Heat
Aug 21, 2011
263
kentucky
I have an Englander 10-cpm multifuel that i am getting reading to install in my basement. Yes it is fully insulated and finished out. The prob im having. The walls are gonna be to thick for the thimble to overlap.
Seems whoever finished the basement, set the studs on the outside of the top plate, which is a 2x4. Sort of hard to explain. But the walls are quite thick. Counting the drywall and the block that has to be drilled thru. i I have not measure it. But have held the thimble up in the doorway and it looks like the pipe on each end of each thimble will but up together about even or a tad bit less.

So what can i do in a situation such as this? Can i extend the thimble with another piece of stove pipe
 
Check to see if the brand that makes that wall thimble also makes a wall thimble extention. I know of a few brands that make those. Its worth checking it out, or you can call your local dealer and get their input.
 
Make and extender out of some rolled flashing.
 
CJ-SR4ever said:
Check to see if the brand that makes that wall thimble also makes a wall thimble extention. I know of a few brands that make those. Its worth checking it out, or you can call your local dealer and get their input.

X2... They make exstensions for situations like this. I know Simpson Dura-vant does.. Not sure who else. But this this a common problem for finished basements, Block, vapor barrier, studs, drywall (Other wall covering), etc. Adds up quick.

Simpson has the explanation in the installation manual for there venting.
 
Yes. It is simpson duravent. Ill check on an extension. Thanks.

A couple other questions. I know i need high temp silicone on the adapter pipe (the one connecting to the stove blower) and that having a screw in it to hold it on.

But with this pipe being twist lock with a fiberglass rope gasket , do i need put a bead of silicone around the outside seem of each of all the other pipes.?

Also once i get the thimble in the wall i assume i need to keep the insulation from fallen down and touching the thimble? How close can this insulation be to the thimble?
 
jdempsey said:
Yes. It is simpson duravent. Ill check on an extension. Thanks.

A couple other questions. I know i need high temp silicone on the adapter pipe (the one connecting to the stove blower) and that having a screw in it to hold it on.

If you can't get an extension, get a piece of aluminum sheet - HEAVIER than flashing coil stock & roll it & zip screw it to the existing thimble


But with this pipe being twist lock with a fiberglass rope gasket , do i need put a bead of silicone around the outside seem of each of all the other pipes.?

Unless Simpson has REALLY improved the product, you'll either hafta RTV the joints or wrap them in aluminum tape. Their joints have been known to leak small amounts of smoke. Nothing really serious & generally only on the initial start up. Once the entire vent system is pressurized the problem is USUALLY resolved...YMMV

Also once i get the thimble in the wall i assume i need to keep the insulation from fallen down and touching the thimble? How close can this insulation be to the thimble?

No. The thimble is there to keep the insulation from coming into contact with the pellet vent. Insulation can come into contact with the thimble.
 
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