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Old 11-25-2008, 05:44 AM   #1
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Insulate concrete flor above open crawl space...


I have a concrete and block porch that has been enclosed to create a living space. The concrete floor is covered with slate tile and is very cold. The entire room is insulated except the floor. The area below is closed but not completely sealed. What is the best way to insulate the concrete floor from below?

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Old 11-25-2008, 06:02 AM   #2
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Insulate concrete flor above open crawl space...


pic;s please.

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Old 11-25-2008, 06:08 AM   #3
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Insulate concrete flor above open crawl space...


I will post pictures later today after the sun comes up.
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Old 11-25-2008, 07:36 AM   #4
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Insulate concrete flor above open crawl space...



This is the enclosed porch. It has 4 separate crawl spaces. All crawl spaces have been covered with 6 mil plastic. #1 is located to the left of the cellar door, #2 is to the right of the cellar door and under the stairs, #3 is behind the door with the vent to the right of the stairs, and #4 is behind the access door on the right. All spaces are devided by block walls and have a 4" concrete ceiling.


This the crawl space with the vented door before I installed the 6 mil plactic over the dirt. The hot water baseboard gets the room up to 68 degrees so this week I am installing rigid insulation over the brick 1/2 walls hoping to hold in more heat so that the room gets warmer without adding another baseboard.

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Old 11-25-2008, 07:57 AM   #5
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Insulate concrete flor above open crawl space...


I'm thinking you could install 2" ridged insulation to the bottom of the slab. But then, with concrete the slab should be isolated from the cold. you will need to insulate the out side edges of the slab also which will be exposed to the cold. Another problem is your windows, is the glass insulated, and last one fix would be to put that room on a separate zone of heat. BOB
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Old 11-25-2008, 08:07 AM   #6
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Insulate concrete flor above open crawl space...


Yes, the windows are new double panes with low-e. The interior brick walls are insulated are being covered with rigid insulation. I hope that count to insulating the outer walls.
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Old 11-25-2008, 08:13 AM   #7
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Insulate concrete flor above open crawl space...


it will help some what. but you will not be able to reach the same temp as the rest of the house. if this room is on the same heating zone as the rest of the house ? BOB
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Old 11-25-2008, 08:17 AM   #8
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Insulate concrete flor above open crawl space...


Sorry for the confusion. It has a seperate zone but the zone stopped heating at 68 degrees so now I am adding the rigid insulation to the inside of the outside walls. There is now a 5 degree difference between the rigid insulation surface and the brick surface when the heat is on so I hope that once I cover the all of the walls the room temp will rise by 3-5 degress or more when needed.
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Old 11-25-2008, 08:21 AM   #9
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Insulate concrete flor above open crawl space...


how much baseboard do you have installed.?
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Old 11-25-2008, 08:29 AM   #10
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Insulate concrete flor above open crawl space...




This is a picture of the rigid insulation being installed. I am using pink stuff and foam on the top before I install the wood caps around the entire room. The baseboard is a 10 feet commercial system that uses 3/4" copper piping.
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Old 11-25-2008, 08:31 AM   #11
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Insulate concrete flor above open crawl space...


The room is 12'x24'x8'. The baseboard is located on a 12' south facing wall.
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Old 11-25-2008, 08:40 AM   #12
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Insulate concrete flor above open crawl space...


Nice looking room.
I would of split up the heat. by putting it on the north wall and part of the front wall and the same for the south wall. try posting this question in the plumbing forum and see what you get for responses. I don't think you have the right amount of baseboard heat for that room .
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Old 11-25-2008, 08:43 AM   #13
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Insulate concrete flor above open crawl space...


Thanks...will do.

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