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Old 08-29-2010, 08:36 AM   #1
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Solarium in Illinois


We are thinking of building a solarium on a pre existing deck. The deck is approximately 18" up from the ground. I am getting a lot of heat from my carpenter brother who says it will be very cold without putting on a poured or block foundation. The solarium will fit into a corner of the house so two walls will already have foundation. The interior floor will also be ceramic and the room will be heated with a Fredrichs commercial grade heating & cooling unit. Feedback please??

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Old 08-29-2010, 09:17 AM   #2
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Solarium in Illinois


The post is a little sparse on details to comment on the merits. Two walls are on a foundation. What about the third wall? What about the structure? Joist size and span? Ceramic tile requires a rigid base. Going from a deck to tile requires modification.
Transitional use might not be possible.
Ron

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Old 08-29-2010, 10:38 AM   #3
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Solarium in Illinois


Sorry, Ron, I will try to explain better (you are dealing with a female!!) The room will be done by a reputable four seasons company and it has already been approved to do the solarium (all glass) after removing deck boards and using the joists that already exist. The two foundation walls I'm referring to are the poured ones from the house. We would rather not go the extra expense with blocking on the other two sides but I do not want this room to be cold in January nor do I want to spend a fortune heating it! I have spoken to a couple people that have solariums built the same way but am still unsure. The company will also do the necessary prep work for the ceramic tile. To summarize if it's -20 degrees under the insulated floor how much will that effect the interior of my room???
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Old 08-29-2010, 02:56 PM   #4
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Solarium in Illinois


You still haven't said what the other 2 "foundation" walls are made of? How do you expect to keep the cold air from getting under the deck? How are you insulating the floor? What's the heating source?
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Old 08-30-2010, 11:42 AM   #5
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Solarium in Illinois


If you insulate the joist bays, then put a layer of foam board underneath that, you should have enough of a thermal break AND a good air seal to prevent cold air convection.
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