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Old 08-08-2013, 01:39 AM   #1
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Old house, no sill gasket - capillary moisture question


Ok, please forgive me in advance if this is a stupid question. I know very little about this stuff but I'm trying to learn.

I'm looking to improve the comfort and energy efficiency of my house while upgrading the siding and doing some remodeling. My old house wasn't built with a sill plate - the rim joist just sits right on top of the foundation. If I add a lot of insulation to the walls, both inside the cavities and foam board outside the sheathing, am I going to accumulate moisture through capillarity that can't get out? The purpose of a sill gasket is to provide a barrier for this, right? If I don't have a sill gasket, some moisture is going to migrate up through the foundation walls and will come into contact with the wood framing.

I don't have any bulk water issues btw. Thanks in advance!

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Old 08-08-2013, 10:14 AM   #2
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Old house, no sill gasket - capillary moisture question


Got a picture inside and outside in that area.
The siding should be running at least 1" below the foundation, is it"
Was the rim joist at least pressure treated?

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Old 08-09-2013, 01:04 AM   #3
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Old house, no sill gasket - capillary moisture question


I doubt the rim joist was pressure treated. Did they pressure treat wood back in the 1910-1920 era?

I don't believe the siding runs below the foundation, but if I can reside according to plan I'd like to run the foam board all the way down below grade then just stucco over it.
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Old 08-09-2013, 07:34 AM   #4
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Old house, no sill gasket - capillary moisture question


There was no pressure treated back then.
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Old 08-09-2013, 07:47 AM   #5
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Old house, no sill gasket - capillary moisture question


A sill gasket helps to stop air leakage between the foundation and framing, but it does also serve as a capillary break.

I would take a look at your existing framing to see if there is any rot. I had to replace a large section of rim joist (it was actually more of a beam, 7"x7") on my old house because of rot. I installed a membrane between the foundation and rim joist to prevent any future issues.

If you are really concerned you could jack the house up ever so slightly and slide something in between.
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Old 08-09-2013, 08:55 AM   #6
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Old house, no sill gasket - capillary moisture question


My rim joist is spray foamed. I'm not worried about air leaks.

I will check for rot.

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