Psi is a measure of compressive strength or the ability of the material to carry loads and handle compression.
Recommended compressive strength of residential basement concrete floor slab.
This concrete is generally more affordable than higher strength concrete.
Aci goes further and recommends 4500 psi concrete for garages floor slab.
Standard concrete floor slab thickness in residential construction is 4 inches.
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The irc requires that slabs be built with concrete with compressive strengths from 2500 to 3500 psi depending on the climate.
As a practical consideration residential designers need to keep in mind that concrete foundation walls are typically 6 8 or 10 inches thick nominal.
To achieve this strength the water cement ratio should be kept at 0 5 or less typically about a 5 inch slump concrete.
Five to six inches is recommended if the concrete will receive occasional heavy loads such as motor homes or garbage trucks.
This type of concrete can be used for sidewalks and residential driveways.
The 4 inch pour of a standard slab is recommended for both garage floors and interior floors.
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.
Good slabs on ground are made from a mix in which the water cement ratio is kept low and they contain as much coarse aggregate as possible at the surface.
The weight of concrete slabs and foundation backfill may imply that the highest strength insulation makes the most sense.
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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.
Compressive strength must be at least 3500 psi.
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The typical concrete compressive strength used in residential construction is 2 500 or 3 000 psi although other strengths are available.
1 2500 3000 psi most concrete has a psi rating of 2500 to 3000.
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.
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.
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.
