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Author Topic: Geodesic dome greenhouse build  (Read 3068 times)

SeaWalnut

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Re: Geodesic dome greenhouse build
« Reply #50 on: August 20, 2019, 08:33:00 AM »
The anchors of the dome.Each had to be custom made from 1,5 mm thick metal plate wich i cut it in shape with a chisel and a hacksaw.Most of the work done with the chisel ,like the antichrist( i hope my neighbours forgive me  ;D).



And now i do the final step before starting to cover it.
I mixed 50/50 paraffine with boiled linseed oil and i spread it with somme rags over the painted wood structure.
The idea is that the linseed oil dryes and then the paraffine hardens ,providing a water repellent surface and protection against mold.
The structure has 2 coats of boiled linseed oil,2 coats of paint and a thick coat of wax-linseed oil mix.Hope it lasts.



SeaWalnut

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Re: Geodesic dome greenhouse build
« Reply #51 on: August 22, 2019, 01:27:10 AM »
The adjustable tool i made for measuring the polycarbonate triangles( works on exterior only).



Ive started installing the exterior polycarbonate triangles.Dilatation gap @ 3 mm ,screws and aluminum tape sealing the edge of every triangle.




Oolie

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Re: Geodesic dome greenhouse build
« Reply #52 on: August 22, 2019, 12:00:32 PM »
On the topic of unsolicited advice, if you could seal the space between layers and pull a vacuum on it, you can limit the convection of heat outwards. This should solve the condensation issue.

SeaWalnut

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Re: Geodesic dome greenhouse build
« Reply #53 on: August 22, 2019, 06:43:50 PM »
On the topic of unsolicited advice, if you could seal the space between layers and pull a vacuum on it, you can limit the convection of heat outwards. This should solve the condensation issue.
I know what your thinking.To seal with tape each triangle between the wood structure and the pannels.
 That would be too expensive and its not possible ,because the wood has wax on it and the tape does not adhere to the wax.
But there wont be problem with convection altough it will not be a vacuumed space.Glasswool its not vacuumed and still not much convexion.Il have less convexion between my pannels than glasswool between plaster boards or otther porous building material.

SeaWalnut

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Re: Geodesic dome greenhouse build
« Reply #54 on: August 30, 2019, 02:38:14 AM »
Fire test for the polycarbonate.Doesnt fuels the fire.Il have to say im impressed and i toght this will start burning like a candle.

SeaWalnut

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Re: Geodesic dome greenhouse build
« Reply #55 on: October 16, 2019, 07:36:44 AM »
The dome today.Almost finished the exterior polycarbonate covering ( except 5 windows on the top).
Next il have to build the stove ,add the 5 temporary windows on top and then add another layer of polycarbonate,3 mm thick indoor.
The door is also temporary covered just for this winter.
The colored stirofoam on the foundation has to be covered in somme cement adhesive and fiberglass.


brian

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Re: Geodesic dome greenhouse build
« Reply #56 on: October 16, 2019, 10:13:24 AM »
It looks great!

Has it rained yet?  My experience is that where the screws puncture the plastic some small amount of water gets in, and it may collect at the low points of each triangle.  You may need to allow drainage at the low edges.

poofystuff

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Re: Geodesic dome greenhouse build
« Reply #57 on: October 16, 2019, 11:28:57 AM »
It looks great!

Has it rained yet?  My experience is that where the screws puncture the plastic some small amount of water gets in, and it may collect at the low points of each triangle.  You may need to allow drainage at the low edges.

Looks like the foil backed tape covers the screws, so he should be fine there.

SeaWalnut

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Re: Geodesic dome greenhouse build
« Reply #58 on: October 16, 2019, 01:35:11 PM »
It rained a lot and the dome is covered in morning dew every day on the exterior only.
And because the tape covers the screws well i didnt got any water in any single channel of the triangles except triangles on the back side wich i let uncovered for a few weeks because i didnt had tape and 2 triangles on the front wich i think they had that water in them allready.
The water got inside just in the screw pierced channel and only a few  chanels .
On the front triangles that have a little water its not in the screws lines thats why i think it was there before and has nothing to do with the screws.
I used a lot of tape but compared to any polycarbonate even mounted profesionally like in bus stations and shops,mein still  looks better and is better sealed.
How long will it stay that well sealed? Well see  ;D.
As for the few lines that got water inside,im thinking to drain them using a seringe and then il cover the seringe needle hole with a little tape.
What looks weird is the foil left on the inside of the polycarbonate.Il take it out when il install the second layer of polycarbonate indoor.


« Last Edit: October 16, 2019, 01:37:55 PM by SeaWalnut »

Mark in Texas

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Re: Geodesic dome greenhouse build
« Reply #59 on: October 21, 2019, 08:46:24 AM »
Well done!  Congrats!

SeaWalnut

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Re: Geodesic dome greenhouse build
« Reply #60 on: November 22, 2019, 08:59:15 AM »
Condensation happens only on the single wall pannels.
The double wall pannels have zero condensation due to the thermal insulation.
Soon im gonna cover all the dome in double layer wall but this is the proof that double walls stop condensation and keep the heat inside.

Kevin Jones

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Re: Geodesic dome greenhouse build
« Reply #61 on: November 22, 2019, 12:40:52 PM »
Beautiful! Functional!
And a work of art!

Kevin

SeaWalnut

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Re: Geodesic dome greenhouse build
« Reply #62 on: January 11, 2020, 06:14:55 AM »
Beautiful! Functional!
And a work of art!

Kevin
Thank you Kevin! You compliment weights a lot to me because you had a geodesic dome too.

New pics with almost finished double wall( for thermal insulation and anticondens).
Looks great with the aluminum tape indoor,its superb insulated and no condens raining from the ceiling.
 


Here you can see that at the joints the aluminum is wet on the interior and appears darker .That happens because the joints form a thermal bridge.
They get colder ,somme heat its lost through there and somme little condens is formed but nothing to worry about and certainly it doesnt ,,rain,, from the joints.
I cant be more happyer about the double wall.It was expensive to do it but ive opted for quality vs quantity.
Keeps the heat in and stops condensation.


The heating device: its too small and over engineered.Il have to build another one simpler with same high quality materials ( stainless steel exhaust that heats through the floor ,a bigger rocket stove insulated outdoor and the insulation underneath the exhaust through the floor that people use stirofoam,il use refractory grade insulator-ytong,so that in case a fire happens the stirofoam wont melt or burn).

Somme of my plants.The browned one its Ugni and looks bad becauae ive kept it outdoor in the pot and it got too cold and wet inside the pot for it to thrive.Its not dead and allready started to recover.
The tomato in the bucket i found it at garbage( including the bucket) and ,,rescued,, her  :)
« Last Edit: January 11, 2020, 06:32:57 AM by SeaWalnut »

 

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