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A Foundation Process
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| Chalk line trenching mark based on squaring up the
area using the pythagorean theorem, (i.e. hypotnuse of the triangle) It was
measured across the diagonals to make sure both distances were the same. Using a transit to know where the form should be level, the form work was setup 8" above grade to accommodate 4" gravel and 4" of slab. 1x2" 32" stakes used to secure form boards to ground w/ 1x2" kicker boards to keep the formwork from blowing out all screwed in. 6 mil vapor barrier and 6"x6" #10 reinforcing mesh laid over gravel bed. Screed guide setup by finisher. A thin layer of gravel was also spread across the top of the plastic to hold it down and to assist in keeping the drying time of the slab above more even. 1/2" rebar was measured and placed in the trench 2 lengths at the bottom of the footing and 1 to sit above on the outside. The rebar was tied using metal tie wire overlapping at least 2ft where connected. Wire was tied to stakes that sat on top of form work and gravel bed measured down from the form 3" into the slab and tied to the top 1/2" rebar and 3" from the bottom of the trench tied again to another 1/2" rebar. The inner rebar for the bottom was just set on 3" dobies every 4 ft. 15 cubic yards of 3/4" aggregate 5 sac 3000 PSI ready mix was used for the concrete. We had the first truck 9 yards mixed dryer for the footings so that it would not seep as much out of the trench. The trenches were poured first then the slab. We had 3 people on site, one finisher and 2 assistants. While the footings were being poured we would cut the wire that held the rebar once the concrete reached it and pushed the remaining wire into the slab. Push the concrete to fill lower levels while screeding. The slab was poured in 2 sections with a screed guide set in the middle. Concrete cure was sprayed on which seals the slab so that the water can stay in and cure without drying too quickly. It did not need to cover it with plastic. It cured 3 days then the formwork was removed. The form stakes which secured the form boards into the ground were broken and removed. Kicker boards were salvaged as well as the main form boards. |
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