Chimney Construction

[Tubingluvr]

Going to be building a new chimney for my wood burning fireplace.
I have stove pipe there now.
Chimney will be built on outside wall of house inside garage.
Can i get away with building it on my garage floor slab or do I need to cut into garage floor and pour footing.

 

[itsaboattime]

Re: Chimney Construction

That depends on how thick the garage floor is.

Are we talking about a brick chimney??

The only reason I ask is because you can buy stainless triple insulated chimney pipe at Lowes. It connects into your existing stovepipe as it comes through the wall. A wall mount supports the weight and a couple sections of triple insulated runs up through the garage roof and outside.

I'll bet it's cheaper than a brick chimney and alot less labor intensive.

But of course if you want a brick chimney you are going to need to find out how thick your garage floor is and how much, approximatly, the chimney will weigh.

 

[wakeondude]

Re: Chimney Construction

How old is the garage floor? I agree with the question of the floor thickness. If it's 20 years or newer and a GC built the home then chances are it's around 4" thick. How high will the chase be for the flu and what type of material do you plan on using?

If this was me I would say yes to footings. I didn't look to see what part of the country your from so I'm not sure if freezing is a factor but if it is then obviously you would need to go to frost level for your footers which would be more of a pita. If freezing is not a factor then I would still bust the floor out to inspect the floor base. Maybe some prob to check the sub-terrain. Throw a thickened slab in and start building.

If aesthetics is not a issue then I would agree with itsaboutimes idea of the triple wall flu pipe. Definitely the easiest way to go.

 

[marlboro180]

Re: Chimney Construction

do I need to cut into garage floor and pour footing.

Yes.

I would never trust a garage floor to carry the load of a masonry chimney.What is going going to happen when the garage floor shifts or heaves due to the cold, is that the chimney , if placed on top of the slab, is going to shift around as well, thus breaking/ compromising the structural integrity of the chimney.
It needs to be on its own footing.

 

[Tubingluvr]

Re: Chimney Construction

I have triple wall pipe where it goes through the wall and roof and stove pipe above the roof but i don't like the way it looks and I believe a Masonry chimney is safer.

I think I will be cutting into the floor tomorrow and digging a big hole .......have to get below frost line.

Yep this how I spend my vacation time.....sounds like a lot of fun huh?

 

[Wills03]

Re: Chimney Construction

Footing is required by building codes and if you ever sell expect problems from home inspectors without the footing in place. I am on a job now where a house flipper finished a basement in which we discovered many electrical code violations.
Present owner is furious and taking legal action. It is going to be a mess.

Wills

 

[marlboro180]

Re: Chimney Construction

Footing is required by building codes and if you ever sell expect problems from home inspectors without the footing in place. I am on a job now where a house flipper finished a basement in which we discovered many electrical code violations.
Present owner is furious and taking legal action. It is going to be a mess.

Wills

All too common, takes a person with common sense on both sides of a sale to make a good decision.....

I think I will be cutting into the floor tomorrow and digging a big hole .......have to get below frost line.

Yep this how I spend my vacation time.....sounds like a lot of fun huh?

Good to hear you are having fun on your vacation, and doing the chimney correctly!

 

[Bob_VT]

Re: Chimney Construction

I would cut through the floor and make a footing..... are you going to use brick or block?

I like using block and then change over to brick just before it exits the roof. I also use chimney tiles

 

[j_martin]

Re: Chimney Construction

Personally, I like the insulated class 1 stainless chimney for these reasons.
1. Easy, neat setup.
2. Tighter, easier to control chimney fire without damage.
3. Insulated, builds up creosote slower than a clay flue in cement block.


I used to be in the wood burner business at the wholesale level. Any time a customer would build an outside masonry chimney against my recommendation, they would have a messy, destroyed chimney in one season.

On a large boiler install, usually a district heating setup, I would recommend the masonry chimney would be insulated with fiberglass and metal frame sheet rock or cement board.

Creosote is to smoke what water is to steam. If you keep the chimney warm, it'll stay clean and dry.