Posted by: Scott McCullough | August 25, 2011

Footings and Frost Wall Poured

Our foundation footings were poured on Monday.

This is the first time we’ve had something permanent on the site that we can take exact measurements off of, sort of.  Footings although are flat on top aren’t usually squared off very well.  They don’t need to be as long as they are least as big as specified.

And yesterday the frost wall was poured on the south side of the house, which we backfilled last night.

Usually the rebar coming out of the footings are put in place while the footings are poured, which isn’t too hard since it sits in the middle of a 8″ or 10″ concrete wall.  In this case though it would have been difficult to locate that rebar accurately due to the fact that it sits in the middle of the 4″ thick inner wythe of concrete.  So after the footings were poured and the walls were accurately located with chalk lines, the rebar was drilled for and epoxied into the footings.

The outer most chalk line in the close up photo of the frost wall represents the outside of foundation wall.  The frost wall was poured a bit wider in order to support the formwork for the wall above.  The top portion of extra 2″ will be removed with a concrete saw later on so that the change in width is low enough to bury below grade

You may notice above that we’ve also painted the tops of the footings where the inside wythe of concrete will sit.  The idea is that this will impede the ability of the wall to absorb moisture from the footing below.  I’ve seen details in building science publications where tar is recommended as going there.  Our foundation contractor, Sonny, was not excited about that idea, as it will get tar all over the bottom of his formwork.  So we went with aN epoxy reinforced latex concrete paint.

Friday (tomorrow) is scheduled for concrete formwork to go up for the basement walls along with the Thermomass insulation.  We met with the foundation contractor early today to make sure everything is set for tomorrow morning.  One thing we will be keeping our eye on is Hurricane Irene making it’s way up the coast.  New Hampshire will at least get a tropical storm which will of course bring lots of rain and high winds.  Sonny is not worried about it though, once the formwork is up it is very stable, and the rain should stay below the footing height.


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