Author Topic: Question about chimney in a greenhouse (Read 1426 times)

Plantinyum · « **on:** March 24, 2021, 04:31:34 PM »

Hi, was wondering what can I use as a separation/isolation material for in between a policarbonate sheet and a metal pipe chimney ?? Dunno if I explained it correctly , but I am talking about the part where the chimney goes trough the policarbonate.
Thanks in advance !!!

brian · « **Reply #1 on:** March 24, 2021, 04:32:38 PM »

Asbestos!

Plantinyum · « **Reply #2 on:** March 24, 2021, 04:38:10 PM »

Quote from: brian on March 24, 2021, 04:32:38 PM

Asbestos!

that was quick ! U mean the asbestos sheets that come in rolls ?? Do I glue them to the poli?

Kevin Jones · « **Reply #3 on:** March 24, 2021, 04:41:51 PM »

I gotta say... last month during that extreme cold snap... a chimney and fire was sounding pretty good in my Greenhouses. Never happened... but I did ponder the idea.

Kevin

brian · « **Reply #4 on:** March 24, 2021, 04:46:40 PM »

I dunno where to get it but the stuff is magic. Its use is restricted here but might not be in your country. You just have to find some way to ensure it will not be damaged... as the dust is known to be rather bad for your lungs

Fiberglass is more common. It comes in all different forms.

Plantinyum · « **Reply #5 on:** March 24, 2021, 04:49:47 PM »

Yeah, this will be my emergency route, if it gets too cold and the radiators cant heat enough ...I am expecting I will be forced to use the wood stove quite often thought ...

brian · « **Reply #6 on:** March 24, 2021, 04:51:12 PM »

You might want a carbon monoxide detector in there.

Plantinyum · « **Reply #7 on:** March 24, 2021, 05:06:19 PM »

Quote from: brian on March 24, 2021, 04:51:12 PM

You might want a carbon monoxide detector in there.

will there be any toxic gases from the fire?? I mean except those that get released trough the chimney . People have fireplaces in their home and do not have problems, I can ventilate from time to time by opening the door and was actually thinking about a ventilation system for the near future .

brian · « **Reply #8 on:** March 24, 2021, 05:09:50 PM »

If you have poor combustion, poor ventilation, some anomaly, it could kill you. They are really cheap, it is good insurance.

swincher · « **Reply #9 on:** March 24, 2021, 07:52:53 PM »

Yeah, any time any type of combustion is happening indoors, you should have a CO detector. Wood fire, gas furnace, propane burner, etc... any of them could potentially produce carbon monoxide if there's a problem with air flow, and it's very easy to install one just in case.

FMfruitforest · « **Reply #10 on:** March 24, 2021, 07:58:53 PM »

A3 Grade Vermiculite

Plantinyum · « **Reply #11 on:** March 25, 2021, 02:24:55 AM »

Ok thank u all , I will look into the CO detectors .

Quote from: FMfruitforest on March 24, 2021, 07:58:53 PM

A3 Grade Vermiculite

this stuff is nice, but it may be too stiff for my particular case, since I need the material to follow the form of the policarbonate sheet which is curved and not straight...

lebmung · « **Reply #12 on:** March 25, 2021, 10:53:33 AM »

Quote from: brian on March 24, 2021, 04:32:38 PM

Asbestos!

It's been forbidden long time in Europe !

If you are planning to use the cheap and easy way with a metal sheet chimney that it will get hot.

The safest and best for this project is a chimney made out of bricks. The bricks won't get that hot to melt the poly and you can seal the join with a fire resistant silicone. Also bricks act like a thermal battery.

Other more expensive option is those insulated stainless steel chimneys but quite expensive like 200€/m and around the chimney use metal sheet.
Lindab has an accessory like that for 300€. I don't think this are an option for a hobby GH.

There is also another way use a rocket stove design and the chimney is horizonal outside the greenhouse then vertical.

Plantinyum · « **Reply #13 on:** March 25, 2021, 01:38:02 PM »

Quote from: lebmung on March 25, 2021, 10:53:33 AM

Quote from: brian on March 24, 2021, 04:32:38 PM
Asbestos!

It's been forbidden long time in Europe !

If you are planning to use the cheap and easy way with a metal sheet chimney that it will get hot.

The safest and best for this project is a chimney made out of bricks. The bricks won't get that hot to melt the poly and you can seal the join with a fire resistant silicone. Also bricks act like a thermal battery.

Other more expensive option is those insulated stainless steel chimneys but quite expensive like 200€/m and around the chimney use metal sheet.
Lindab has an accessory like that for 300€. I don't think this are an option for a hobby GH.

There is also another way use a rocket stove design and the chimney is horizonal outside the greenhouse then vertical.

lol I am def in for the cheapest Idea ...I may just figure a metal sheet around the chimney , just like u said , I have seen pics of this method in action..Building a brick one will take too much space in my gh which is quite small to begin with .
I think I will do two thin metal sheets connected to the poli, with a thick rubber sheet in between them, which will not be touching the chimney. The metal sheets will be firm on the chimney and thus will hold it in place .

lebmung · « **Reply #14 on:** March 25, 2021, 08:10:39 PM »

Metal sheets will get hot as the heat goes to the top especially in small GH.

In a small GH you need a heat sick like water or bricks otherwise it will get too hot fast and then cold.

Here are those ready made horn bricks that cost 2€ a piece and with 10-12 pieces you are done.
Very easy to mortar them.

Alejandro45 · « **Reply #15 on:** March 25, 2021, 08:57:47 PM »

Look into rockwool ridgid boards. They work like fiberglass but made from stone/slag. It's inert and insect resistant.

elouicious · « **Reply #16 on:** March 25, 2021, 09:36:09 PM »

I may or may not have burned a fire near my plants for ~36h in houston, may have helped a bit

spaugh · « **Reply #17 on:** March 25, 2021, 09:53:09 PM »

listen to lebmung, small fire, big thermal battery is what you want. if done properly, the chimney wont be hot, all the energy will be in the thermal mass.

Plantinyum · « **Reply #18 on:** March 28, 2021, 08:37:02 AM »

Heres the wood stove I will be using, the brick chimney idea is good and all, but I,d rather not do it, plus the cleaning of it will be a pita when I cant go up to clean it , I will already have the radiators for the constant/thermal battery heat supply .

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Author Topic: Question about chimney in a greenhouse (Read 1426 times)