| Slab-on-grade foundations are concrete
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| | in a way that compensates for the weak
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| slabs poured directly on the ground with
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| | characteristics of each.You will also see
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| no space between the ground and the
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| | what is called WWF (welded wire fabric)
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| concrete. This most often occurs in areas
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| | also called as reinforcing in concrete
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| where the ground is not subject to
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| | but its true purpose is to distribute
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| freezing and therefore not likely to
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| | temperature changes in the concrete more
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| heave. There are derivations of this
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| | evenly to prevent cracking, the proper
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| where frost underneath the structure is
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| | term is controlling cracking. I say
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| controlled with foam insulation or
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| | prevent cracking, but you will still have
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| hydronic (hot-water) heating systems
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| | cracking in concrete, it is the nature of
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| incorporated into the slab to prevent the
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| | concrete to crack, so another step taken
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| ground below from freezing. However, it
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| | to minimize the effect of cracking is the
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| is usually not typically economically
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| | process of placing control joints at
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| favorable to use the slab-on-grade in
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| | specified intervals to guide the cracks
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| very cold climates. There is at type
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| | to the bottom of the crack where they
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| called a Frost protected Slab that is
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| | will not be seen and to minimize the
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| standard in Sweden and is gaining
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| | travel of any one crack. If you see minor
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| acceptance here.The advantages of
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| | cracks in the bottom of the control
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| slab-on-grade are that it is a relative
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| | joint, do not panic, it is normal. The
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| inexpensive form of residential
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| | design and placement is very important to
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| foundation, they are very sturdy when
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| | the integrity of the slab. Discuss this
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| properly designed and constructed and
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| | in detail with your selected concrete sub
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| helps obstruct termites from entering the
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| | to make sure adequate control joints are
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| house. When properly constructed they
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| | placed in the slab.Proper Construction
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| offer very few spaces in the foundation
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| | Means Proper CuringThe key to a good
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| itself for termites to intrude into the
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| | slab-on-grade foundation that has been
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| structure from below. This assumes that
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| | properly designed is to allow time to wet
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| all pipe penetrations are properly sealed
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| | cure the concrete. Concrete is poured as
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| with stainless steel wool or adequate
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| | liquid, but begins to harden immediately.
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| caulk to prevent their passage. It also
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| | It is usually hard enough to walk on in a
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| reduces the amount of perimeter crack
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| | day. It should not be built on for a
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| that is vulnerable to infestation making
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| | minimum for seven days and you must take
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| treatment easier in the event that
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| | care that the temperatures are not too
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| termites do get into the house.You must
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| | cold or too hot when you pour it. The
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| plan carefully for utility penetrations
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| | benefits of proper curing are:Increased
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| through the slab for water, electric,
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| | strength gainIncreased abrasion
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| gas, telecommunications and any other
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| | resistance on the surfaceLess permeable
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| utilities. This is often times
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| | concrete with increased resistance to
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| overlooked, especially because we fail to
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| | chloride penetration and freeze/thaw
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| account for changes in technology.When
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| | damageIncreased resistance to early
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| planning a slab-on-grade foundation, you
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| | cracking--slabs gain strength before
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| must bring a conduit from underneath to
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| | drying out and have more resistance to
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| an accessible place outside for water.
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| | shrinkage forces.So what is a proper
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| Most plumbers will direct bury the line
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| | method of curing. Well in warm climates,
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| or embed the copper lines directly in the
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| | it entails keeping the concrete damp for
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| slab. This is not a good practice because
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| | a minimum of 7 days. This is accomplished
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| it makes repair costly and difficult if
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| | by spraying water on the slab every day
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| something goes wrong with the water line.
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| | (twice a day if needed) spraying the
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| If you install a 2' PVC conduit for the
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| | concrete and covering it with plastic
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| water line, a new one can be pulled in
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| | sheeting to retain the water within or
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| later if you need to. This will also
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| | using some other medium (kept wet) such
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| prevent the copper or galvanized water
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| | as sand, straw, or blankets to do this
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| line from degrading from contact with
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| | function for at least 7 days, the longer
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| bare concrete.The same procedure needs to
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| | the better. With proper planning this
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| be followed for cable and telephone. You
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| | will be possible although if you are
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| can put both services in the same conduit
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| | working with a builder, he will probably
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| in this case so one 2' conduit should
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| | want to start framing as quick as
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| adequately suffice in this case.
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| | possible after the slab is poured. Do
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| Electrical services must enter a
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| | yourself a favor and allow the 7 days for
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| disconnect on the exterior of the house
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| | proper curing and make sure that adequate
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| so it is not typical that you will need
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| | methods are employed to retain moisture
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| to provide a conduit under the slab for
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| | in the slab during the process.The last 2
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| this. In all these cases, the conduit
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| | important considerations are temperature
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| should terminate in one central location
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| | when pouring. Concrete generates
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| in the house such as a utility closet or
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| | tremendous heat during the curing stage.
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| garage.Structural
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| | If it is poured at very high temperatures
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| CharacteristicsSlab-on-grade design calls
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| | (over 95 'F) you must take special
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| for a slab thickness a minimum of 4"
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| | precautions to mitigate the heat, talk
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| thickening to a minimum of 6" within
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| | with your contractor if you suspect you
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| about 16" of the perimeter for
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| | will have this condition to make sure he
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| additional reinforcing steel to support
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| | is prepared to take the proper steps to
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| exterior wall loads. If there is to be a
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| | protect the concrete. Concomitantly, you
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| interior bearing wall, the engineer will
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| | should not pour concrete when the
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| also call for this area to be thickened
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| | temperature is below 20 'F unless you are
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| and more reinforcing to compensate for
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| | prepared to maintain heat on the slab
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| these loads.Perimeter footers and
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| | until it has fully cured. This will be
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| interior footers or rafts are typically
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| | very expensive to do so it is best to not
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| reinforced with steel bars called re bar.
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| | pour when temperatures are going to be
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| This adds tremendous strength to the
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| | below freezing for extended periods. You
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| concrete by compensating for the
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| | can do it , but you must make sure to
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| concretes poor tensile strength. By
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| | maintain the internal temperature of the
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| combining steel with concrete, you
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| | concrete at no less than 55 'F.
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| combine two incredibly strong materials
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