To prepare the base cut the ground level to the proper depth to allow for the slab thickness.
Recommended compressive strength of residential basement concrete floor slab.
The typical concrete compressive strength used in residential construction is 2 500 or 3 000 psi although other strengths are available.
Concrete shall be cured for either 3 days at a minimum temperature of 10 c or for the time necessary to reach 40 of the specified 28 day compressive strength.
Compressive strength must be at least 3500 psi.
Three important factors to consider when comparing these two insulations for any belowgrade or under slab application are compressive strength moisture retention and insulating capability.
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C 2 concrete shall be cured for 7 days at a minimum temper ature of 10 c and for the time necessary to reach 70 of the specified 28 day compressive strength.
Five to six inches is recommended if the concrete will receive occasional heavy loads such as motor homes or garbage trucks.
This concrete is generally more affordable than higher strength concrete.
Aci goes further and recommends 4500 psi concrete for garages floor slab.
Water reducing admixtures lower the amount of water needed for workability and improve compressive strength at all ages.
1 2500 3000 psi most concrete has a psi rating of 2500 to 3000.
This type of concrete can be used for sidewalks and residential driveways.
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Standard concrete floor slab thickness in residential construction is 4 inches.
For both interior floors and garage floors the minimum strength recommendation is 2 500 psi however similarly to slab projects an ideal standard is 4 500 psi especially for garage floors which must sustain much more wear and tear and heavy machinery.
To achieve this strength the water cement ratio should be kept at 0 5 or less typically about a 5 inch slump concrete.
The weight of concrete slabs and foundation backfill may imply that the highest strength insulation makes the most sense.
The irc requires that slabs be built with concrete with compressive strengths from 2500 to 3500 psi depending on the climate.
A common design assumption leads to specification of rigid foam strengths that are many orders of magnitude higher than necessary which can double the insulation.
As a practical consideration residential designers need to keep in mind that concrete foundation walls are typically 6 8 or 10 inches thick nominal.
Psi is a measure of compressive strength or the ability of the material to carry loads and handle compression.
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