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  • 7 years later...
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Here it is in text format, but you don't get the pictures. I'll keep

trying.

--------------------------------------------------------------------

ew

In Search of a Low-Cost Greenhouse

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3/6/2009 5:11:27 PM

by Lori Dunn

Tags: greenhouse, thermal mass greenhouse

Lori DunnA greenhouse has always been on my list. You know the list I

speak of, everyone has one. It is the mental list that we all keep of

things we would like to have someday. That “someday” came for me when my

husband suggested we go ahead and put up a greenhouse.

I was extremely excited with the thought of being able to get a jumpstart

on our gardening, and experimenting with different plants and flowers,

but I also knew we needed to be economical about it. We couldn’t afford

to incur a large expense in the construction of the greenhouse, or in the

heating of it later. This sent me on the path of the internet highway to

do some research. As you can imagine, I found lots of information on all

kinds of greenhouses. There is everything from prefabricated kits that

come with everything you need to instructions on building your own

greenhouse out of many different materials. What I found that caught my

attention the most was information on a thermal mass greenhouse. This

type of greenhouse uses energy from the sun to store heat, and then

release that heat at night when it is needed. Energy from the sun = free,

just the right price!

According to the information I found, many things can be used for the

“mass” to collect the heat and energy from the sun. Anything that retains

heat would probably work. Some of the items listed included soil in

raised beds, wood, block or brick foundations, concrete, or even the

floor of the greenhouse. But the most effective and least expensive

thermal mass is water! Again, water = free! It didn’t take much for me to

decide that a thermal mass greenhouse was the way to go for us. But how

would we store the large amounts of water that would be needed? The

recommended amount was about 2-3 gallons of water per square foot.

Apparently, a common practice is to store the water in containers along

the back wall of the greenhouse, or use 55 gallon drums filled with water

to support the benches in the greenhouse. In one instance I read about,

someone had used the method of water in barrels under their benches. They

said it kept the temperatures in the greenhouse above freezing except on

the very coldest nights. On those nights, they used a very small space

heater as a supplement to keep the temperatures up.

My husband and I have a great setup to use this type of greenhouse. Our

basement wall is underground on three sides. The fourth side is exposed

and faces in a southeastern direction. We came up with a plan to use the

face of the exposed basement wall as the back wall of our greenhouse. It

would face the right way to capture the heat from the sun. The block wall

in the back could store some of the sun’s energy, and we would also use

barrels of water on both sides of the greenhouse with planking across the

tops of the barrels as bench tops. The wall we wanted to put the

greenhouse against has a window into the basement. I thought we could

also use this to our advantage. We heat our home with a woodstove in our

basement. This keeps our basement nice and warm too. If we built the

greenhouse around that window, then on the coldest nights, we could open

the window and use a small fan to pull some of the heat from the basement

into the greenhouse as a supplemental heating source. I was excited to

test all this and see if it would work!

Building a thermal mass greenhouse

We began construction in March. We decided to make the greenhouse 8 feet

deep by 24 feet long. My husband was the brains behind all the

measurements. He came up with all the figures and sizes for making the

correct cuts, and attaching the greenhouse to our basement wall. With

some help from our son, my greenhouse soon started to take shape. It

wasn’t long till we had a frame in place.

Constructing a thermal mass greenhouse part 2

We knew that it was also important to have a way to let some of the heat

escape when the temperatures got too hot, so we put a window in on the

parallel wall to the door opening on the shorter 8-foot wall. This would

correspond with the predominant wind flow here, so we could open the

window and door and have air move through.

Constructing a thermal mass greenhouse part 3

Finally the framing was completed. Now, we were ready to wrap the

greenhouse with plastic. This was the one thing that we would later

realize we should have done differently. We wrapped the greenhouse, roof

and sides, with the plastic. Dancing in the streets, laughter, and

applause … MY GREENHOUSE WAS READY TO USE ... well, almost!

Constructing a thermal mass greenhouse part 4

We still had to get the “thermal mass.” This is where my wonderful

son-in-law, Deron, comes into play. Where he works, he has access to

large, 55 gallon black plastic barrels. The company he works for gets

them full of alcohol for sterilization purposes. He was able to get the

empty used barrels for me for free! I LOVE FREE! We set the barrels along

both the outer and inner long, 24-foot walls, and filled them with water.

We then used planking a crossed the tops of the barrels to act as my

bench tops. Now, I was ready to start planting. Since we were already

into March, I wasn’t sure if we could really accurately determine how the

greenhouse would do in colder weather, and I thought I was getting a late

start in getting seeds in the ground to be able to transplant for

planting time. It turned out that timing for transplanting was perfectly

fine by starting my seeds in March. For the most part, everything had

plenty of time to sprout and grow to size for transplanting into the

garden.

Thermal mass greenhouse

We installed one of those thermometers in the greenhouse that has an

extra unit that we could put in our house. This way we could monitor the

temperature of the greenhouse from inside our home.

Seedlings waiting for transplant to the garden

On average, the temperatures inside the greenhouse stayed a good ten

degrees or more than the temperatures outside, overnight, with no extra

heat source. As soon as the sun would come up, the temperature would

raise substantially higher than outside. There were only a couple of

nights that we opened our basement window to the greenhouse, to let in a

little extra heat.

I consider this greenhouse almost a complete success. The one thing that

was a problem for us would not be a problem for most people. When we

bought the plastic to wrap our greenhouse, we did not take into account

the fact that we have free roaming poultry! Here is an interesting little

tidbit for you. Ducks and chickens LOVE to poke holes in plastic! Till

the end of the growing season, the plastic on the greenhouse was pretty

much done for! This is simply what I call a live and learn experience! We

now need to rewrap the greenhouse with plastic. We will either use a

higher grade of plastic, or use plastic sheeting. That will be determined

by cost right now. Either way, we are planning a very large fenced

poultry enclosure, so we shouldn’t have to worry about the same thing

happening again.

All in all, I would recommend this type of greenhouse, but, beware of

ducks and chickens!

--

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Guest guest

That sucks.

:(

Thia

On Fri, Mar 27, 2009 at 11:00 PM, Ernest Willingham <99tomatoes@...

> wrote:

> I cannot figure out how to do that. When ever I click on members or

> photos or anything, I get a message telling me that I need to be a member. I

> follow all of the instructions and go nowhere. I cannot even start a new

> message link. If I want to start a new message, I have to take an old one a

> erase everything and fill in the new info. The only thing I am allow to do

> is hit reply. I have never seen any of the pictures that have been posted by

> this group. About a year ago I asked for help from the group. Got several

> hints and instructions, but none worked.

> ew

>

>

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Guest guest

Thanks, that works fine.

ew

Re: Try again

Date: Sat, 28 Mar 2009 19:20:58 -0000

Another suggestion would be to google " grit magazine thermal

greenhouse " . It took me right to the article and pictures.

Gioia

Nothing better than a tomato picked from your own garden - do yourself a favor

and plant a garden

--

Be Yourself @ mail.com!

Choose From 200+ Email Addresses

Get a Free Account at www.mail.com

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Guest guest

Thanks, that works fine.

ew

Re: Try again

Date: Sat, 28 Mar 2009 19:20:58 -0000

Another suggestion would be to google " grit magazine thermal

greenhouse " . It took me right to the article and pictures.

Gioia

Nothing better than a tomato picked from your own garden - do yourself a favor

and plant a garden

--

Be Yourself @ mail.com!

Choose From 200+ Email Addresses

Get a Free Account at www.mail.com

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Share on other sites

Guest guest

Can't you just do this--copy/paste the following link to your browser if it

won't give you a live link? Checking it out...

http://www.grit.com/Garden/In-Search-of-a-Low-Cost-Greenhouse.aspx

Connie Lacelle

http://www.home-and-school-solutions.com

>

> Another suggestion would be to google " grit magazine thermal greenhouse " . It

took me right to the article and pictures.

>

> Gioia

>

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Guest guest

Can't you just do this--copy/paste the following link to your browser if it

won't give you a live link? Checking it out...

http://www.grit.com/Garden/In-Search-of-a-Low-Cost-Greenhouse.aspx

Connie Lacelle

http://www.home-and-school-solutions.com

>

> Another suggestion would be to google " grit magazine thermal greenhouse " . It

took me right to the article and pictures.

>

> Gioia

>

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