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Old 02-27-2010, 08:21 AM   #16
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Cold rooms


the way i read that post is there is an unfinished room above with the insulation blown on the floor. also that the rim joists are uninsulated all of which means air in at eaxterior wall plane. yes?

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Old 02-27-2010, 08:51 AM   #17
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the way i read that post is there is an unfinished room above with the insulation blown on the floor. also that the rim joists are uninsulated all of which means air in at eaxterior wall plane. yes?

The room is on the main floor... the 2nd floor, they never finished the room so it is just blown in insulation laying on the joists and drywall with no vapor barrier... the basement has rim joists that are not insulated in anyway at all... (on my list of things to do this summer right now)
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Old 02-27-2010, 08:56 AM   #18
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depending on how well the walls are insulated the basement may be creating a chimney effect wanting to pull air from above. also if the top of walls in unfinished room has pipe/electrical penetrations that arent sealed this is another entry point. just a thought
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Old 03-01-2010, 03:04 PM   #19
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depending on how well the walls are insulated the basement may be creating a chimney effect wanting to pull air from above. also if the top of walls in unfinished room has pipe/electrical penetrations that arent sealed this is another entry point. just a thought
Not sure how much those cause it.. the walls are built out of 2x6's and has R-19 insulation (fiberglass faced batts) anywhere there is a line going into a wall there is also spray foam around it to seal it up... I think my biggest problem is the unfinished room upstairs and a rimjoist on the west side of the house right below this room that I cant get to... there is about a 1 inch gap between the top plate of the 2x4 wall in the basement and the cavity the rim joist creates... but you can definatly feel cold air blowing out of it on windy days... I just dont know where its getting in besides the gas line that enters the house on that side... but upstairs there is a ridge vent, a octagon side vent and of course all the soffet vents... the ceiling is not insulated, it's just exposed rafters so cold air moves freely in the room upstairs...
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Old 03-01-2010, 04:14 PM   #20
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Cold rooms


Blue BSh. My inclination was to answer you about checking the (outside) walls. But you exclude that in your answer. My own experience was with two rooms facing outside walls that were never warm in spite of the radiated heat working almost constantly. The solution was in framing out both rooms and inserting R-19 Insulation. Both rooms turned into the warmest in my house.!
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Old 03-02-2010, 10:09 AM   #21
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Here's what the room upstairs looks like (its an unfinished space that has a door into it like all the other rooms upstairs, According to the house plans this should of been a bedroom with a large dormer on it, but they never put a doormer on and just left it at the floor joists and filled it in with insulation and put a vent in)

This room is 30 ft wide (if you go from the end of the roof to the other end, its about 28 ft if you go by internal space only), 22 ft long and has a 8/12 roof pitch... anything that stands out in the pic as something that I can door to help any from the top down?
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Last edited by BlueBSH; 03-02-2010 at 10:13 AM.
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Old 03-02-2010, 10:21 AM   #22
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two sides are exterior walls...

there is a sliding door (about 76x80 inches) and a single window (about 34x40) but I don't feel any drafts coming from them or around them...
From experience; I have two rooms that are close to what you describe. I couldn't feel any drafts. I reluctantly covered the sliding doors and the windows with the plastic film window kits. The difference in room temp was amazing. Easily 6-8*
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Old 03-02-2010, 10:42 AM   #23
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From experience; I have two rooms that are close to what you describe. I couldn't feel any drafts. I reluctantly covered the sliding doors and the windows with the plastic film window kits. The difference in room temp was amazing. Easily 6-8*
I feel what almost feels like air falling from the ceiling. its a wierd feeling it has vertical air flow... already tried covering the window and sliding door with that film stuff and it had no impact on the temp...
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Old 03-02-2010, 11:36 AM   #24
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Cold rooms


Try laying a plastic down in the attic space, something to reduce the airflow.
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Old 03-15-2010, 01:37 PM   #25
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Well I found two sources of air coming in... around the window and sliding door in the room the trim had gaps where they came together at angles... and when it was really windy out this past weekend, I could feel air rushing thorugh the gaps... turns out they never foam sealed the gap between the window and the frame... doesn't explain the other air flow though from top down, but hopefully a vapor barrier will fix that

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