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How to seal a house that is on a new foundation

 
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Hi I don't know if this is the right place to post or not . Any idea on how to seal a house that is sitting on a new foundation?  . The house use to be on a frost wall now it's on a new foundation and the house has never been so cold . The house is 50 years old but completely done over ! insulation, windows  , doors  , sidings   , everything . It was great until we had it put on the full foundation  now we are going through 2 and a half times the oil  its crazy  . The wind seems to be coming in around where the house is sitting . There is a layer of some kind of foam between the foundation and house . Any ideas on how to solve this problem . Thanks
 
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Hi Glen, welcome to Permies!  If you could upload a picture or two of the joint between the walls and the slab it could be very helpful.  To do that, click on Attachments just below the comment field, then Browse to find the picture.

What is your rough location?  North Dakota vs. Georgia could have an impact.

Do you know if there is insulation below the slab?  Is it cold radiating off the floor or actual drafts?
 
glen macdonald
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Hi Mike  first I live in Nova Scotia Canada and it's storming like crazy so I can't get any pics from outside for a day or two. But the furnace room ceiling is open so I got a few pics in that room. The rest of the basement is finished so I can't get pics in that area the rest would have to be from the outside. The floor is insulated with 4 inch blue Styrofoam and some kind of bubble stuff with foil on both sides on top of that . The floor isn't cold at all  the wind seems to be coming in between the foundation and house and seems to be going up the walls and between the upstairs floor and basement ceiling the main floor is always cold especially when it blows . So any work that has to be done would have to be done  from the outside which means the bottom row of siding would have to be removed  in order to do what's got to be done.
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glen macdonald
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Sorry  I thought I sent 3 but I guess not
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Mike Jay
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Hi Glen, I misunderstood, I thought the house was now sitting on a slab.  It sounds like it's really a full basement foundation with poured cement walls.  

The first picture makes it look like there is a wood board on the cement, then a white foam spacer, then the original rim joist.  Am I seeing that correctly?

The second and third photos show what I expected to see which is an old beam sitting on white sill sealer foam.  It looks very loose so I can see how air could easily get though that "seal".  When you're down by that second picture is air blowing in through that gap?

I think, once the lowest part of siding is available to be inspected, it's worth crawling around outside to see if the white foam is visible outside (if the gap continues through to the outside).  If it is, I'm guessing something like Great Stuff or expanding foam may be a way to fill the gap a bit better.


 
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A tool that I have found to be very useful in locating cracks for sealing, is incense... I light a stick, and walk around with it, holding it next to areas where I suspect there might be an air leak. Without a leak, the smoke rises straight up. With a little breeze associated with a leak, the smoke moves all over the place. That can be particularly useful if the wind is blowing outside. Once the leak is located, I fill the hole with calking or foam. Places that I often find leaks are around pipes, wires, light fixtures, light switches, plugs, windows, doors, etc... And at the junction of walls and floor.
 
glen macdonald
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Hi again Mike the first pic is the back corner of the house it's a tight fit in that pic no air at that spot . The second and third are the side of the house there is some air coming in there when the wind is on that side. I did go around with a candle and sealed some drafts that I found . My question is   is there anything that you know of that I can spray or slap on with a brush that hardens up when it dries even if I have to do it a few times . I heard quite awhile ago about someone using this stuff on there roof i think it was . It was kind of a rubber compound that can be sprayed or brushed on . But I have no idea what it was called. Thanks again
 
Mike Jay
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Given the size of the gaps between the wood and the cement, I'd probably try to use Great Stuff.  Roofing cement may work but I'm not sure.  Here's a Great Stuff video of sealing rim joists which is right near where your problem is.  The video makes it look much easier than it is in real life since the can has to stay upside down to squirt out.  But it expands into the crack to seal it up perfectly.

 
glen macdonald
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Hey Mike I tried that spray foam on the back basement entrance awhile ago  but the gap wasn't that bad all it really  did was expand about 4 inches out from the wall. When it dried I cut off 3 plus inches to get the siding back in place I find there is still air coming in around it no as bad mind you . If there was some kind of other sealer I could spray over it  I think that might solve the problem for that area. The rest of the house will be the fun part I think. But I will give it a shot when we get a couple of half decent warmer days . Thanks for all the help I will report back after I get it all done which won't be for a week or so according to the forcast   If you think of anything else I would like to hear  about it . Thanks again
 
Mike Jay
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Good luck with it.  One hint is to just lightly let out a small bead (1/4" diameter) as deep into the crack as you can.  It will expand to 3/4 inch or so.  Putting it in front of the gap doesn't work as well, it's best if it starts out down in the crack.
 
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