Sealing up a crawlspace and running a dehumidifier vs std foundation vents

RatLabGuy said:
interesting... no insulation at all under the joists? I guess the idea is that the crawlspace is now part of the envelope and the new foam board on the walls covers the area?
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Yes, once an encapsulation is done the crawlspace becomes part of the living area technically. It's heated and cooled by the static heat coming off of the HVAC duct assuming you don't have any leaks, and even if you did it works even better. No need to have insulation between the crawlspace and living space since it's the same at that point.
 
RatLabGuy said:
interesting... no insulation at all under the joists? I guess the idea is that the crawlspace is now part of the envelope and the new foam board on the walls covers the area?
How much of that space is above ground? 2" rigid foam = R10. not ideal for anything above ground.
Also might want to pack some foam board or spray along that rim joist.

I like the sealed door panel
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Correct, no insulation between the crawl space and the interior of the home. You're trying to move the air barrier and thermal plane out to the perimeter of the building.

I agree with the point about putting insulation against the rim joist. Batts work well, too.

Keep in mind that it's R-10 continuous, which is roughly equivalent to R-13 or R-15 batts in a stud cavity.
 
shawn said:
Did they do the exterior wall insulation, too?
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If your asking if they insulated the outside of the wall, no...

If your asking if they insulated the rim joist, No. the rigid goes up to about 3 inches from the sill plate and the rim joist is un insulated. I plan on stuffing some rigid in there later on.
 
I dug up some old photos from projects past. Had to log into Myspace to find these things lol. circa 2005.

ai552.photobucket.com_albums_jj335_jrhxj1_cleanspacewall_zpsec60ac98.jpg
This is an example of what we called "running the wall" using a 12 mil fiber reinforced material pinned every few feet and caulk sealed to the brick (top 2"). Exactly like shawn said, it's 4-6" down from the sill for the termite inspections. They get pissy when they cant' see the trails.

ai552.photobucket.com_albums_jj335_jrhxj1_cleanspacewall2_zps628e59ab.jpg
This is as we lay the 16 mil floor down. The wall is left with a few inches of flap so that the floor will overlap it properly and to insure that ground water doesn't seep on top of the floor. 4" white vapor bond tape is being used here.

ai552.photobucket.com_albums_jj335_jrhxj1_cleanspacefloor_zps4a60c2fb.jpg
Pillars are wrapped uniform to the wall, about 6" down from the sill plate for the same purpose and taped to 16-20 mil floor. This gives a good overveiw of what it looks like afterwards.

Just a side note, when these pics were taken I was working for a company based out of Davidson NC by lake Norman and also lived in Davidson at the time.
 
RobMcBee said:
If your asking if they insulated the outside of the wall, no...
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It looks like there's foil faced board insulation on the foundation walls. I was wondering if that was existing or installed by the encapsulation contactor.
 
they did that, its their product. Some sort of carbon infused foam with a foil face. supposed to not break down as fast as normal polystyrene foam. Before it was bare brick
 
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