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Old 10-19-2012, 09:18 PM   #1
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No rim joist?


after reading here about the benefits of insulating your rim joist, i decided to do mine, but when i went to inspect it i didn't see a rim joist area. cuts were made in the cinder block and the floor joists appear to sit directly inside those cuts on top of the cinder block foundation. there is no cavity to insulate like ive been seeing with normal rim joists. You can see in the pictures how the joists are sitting on the block and that there is no joist behind the block. is this normal?
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Last edited by dc350; 10-19-2012 at 09:37 PM.
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Old 10-19-2012, 09:26 PM   #2
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No rim joist?


Picture would be best.

Do you know what the rim joist is?

You believe the joists are sitting in "cuts" in the cinder block? My joists are sitting ON the cinder blocks with a cement mixture poured between the joists against the rim joist. Could this be what your seeing?

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Old 10-19-2012, 09:38 PM   #3
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No rim joist?


i posted some pictures. i don't see any wood at all behind where the joists are sitting
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Old 10-19-2012, 10:08 PM   #4
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No rim joist?


Haven't seen that before.
I have seen concrete poured between the floor joists, but still a rim joist.
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Old 10-20-2012, 07:03 AM   #5
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No rim joist?


It looks like you have an older balloon framed structure---and someone added those cinder blocks long after the structure was built---

How about a picture of the house from the outside?

Age of the house?
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Old 10-20-2012, 07:43 AM   #6
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No rim joist?


Disreguard my post-----that picture was confusing before I had enough coffee-----

I see now that the cinder block is a wall and the framing is resting on the blocks----

Nothing unusual about that method of construction-----

insulating that area? I'll leave that for others----
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Old 10-20-2012, 08:34 AM   #7
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No rim joist?


Looks like expanding foam is about all your going to be able to get in there.
Unpressure treated wood in direct contact with concrete, no termite shield.
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Old 10-20-2012, 09:30 AM   #8
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No rim joist?


in my house, that area was filled with bricks & mortar. but i do have a rim joists. so, i wouldn't doubt that you do to, you just can't see them. i can't see mine either, except for where there is some bricks busted out.
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Old 10-20-2012, 10:00 AM   #9
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No rim joist?


does the concrete block go up tight to the underside of the sub flooring? You probably have a rim joist on the other side of the block...
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Old 10-20-2012, 11:47 AM   #10
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No rim joist?


Rim or not, looks like the sill covers the blocks, the blocks are liable to be filled with mortar, don't see any way to insulate above the block and house. If blocks are hollow, you mite be able to fill them with foam, but i don't think minimal benefit would be worth drilling holes thru floor to see if hollow, or possible structural damage by drilling thru block.

Can you remove some siding outside and get a look from that side?

Seal gaps between blocks, sill, and joists with caulking and/or miniamal expanding foam.

Insulating foundation walls, between joists and with what material, type and location of vapor barrier, depends on several things.. Basement? Finished or unfinished? Heated unheated? Dry or moist? Crawl space? Vented or unvented? Ground covering moisture barrier? Climate of your area. Soil type, moisture in soil around and under house.
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Old 10-20-2012, 01:20 PM   #11
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No rim joist?


spray insulation would be best.
Next is probably low expanding foam in the gaps, Styrofoam sealed with low expanding foam on all sides to floor above and joists.

How are you insulating the rest of the basement?

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