Sunday, November 26, 2006

Floor slab is complete - porches next

Well, the concrete was placed last Monday (Nov 20th) and the results look great. Nice cool weather and humidity were good curing conditions and with the fibermesh reinforcement, I didn't see one crack out there today, just some slight surface "crazing".

Edit - sorry for the somewhat "jerky" picture - the photo stitch software seems to have a bit of a problem with the photos used for some reason.

It looks like they are now preparing to place the concrete for the front and rear covered porches/patios (necessary to do now because the columns in them are structural in nature - they support the roof). I will call the builder tomorrow to check on his schedule. I know the exterior walkways/sidewalks are going to wait until the spring when they won't be damaged during construction activities.

Edit - I called him and the front porch concrete will be placed Tuesday and the rear porch Wednesday - framing lumber to start being delivered as well.

They didn't put sand down over the 15-mil Stegowrap before placing concrete and given the weather conditions and slab/footing construction method, I agree with the decision. Good curing conditions (weather) and a slab placed integrally with the footings (instead of a two-step pour) means the chances of curling are minimal. Curling is one of the main reasons sand is used under the slab, it helps speed curing of the bottom of the slab and protects the vapor barrier from damage.

In using Stegowrap, the vapor barrier material is so durable that protection wasn't required.

Also, the use of sand can be detrimental to a nice, uniform thickness slab without defects, as it gets pushed around and tracked into the concrete during placement.

The time-lapse photo camera seems to be performing well - I wonder if a momentary power glitch caused the problems with not all the photos being taken a couple weeks ago.

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