The 4 inch pour of a standard slab is recommended for both garage floors and interior floors.
Recommended compressive strength of residential basement concrete floor slab.
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.
The weight of concrete slabs and foundation backfill may imply that the highest strength insulation makes the most sense.
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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.
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Psi is a measure of compressive strength or the ability of the material to carry loads and handle compression.
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.
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Compressive strength must be at least 3500 psi.
Standard concrete floor slab thickness in residential construction is 4 inches.
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.
Aci goes further and recommends 4500 psi concrete for garages floor slab.
As a practical consideration residential designers need to keep in mind that concrete foundation walls are typically 6 8 or 10 inches thick nominal.
Water reducing admixtures lower the amount of water needed for workability and improve compressive strength at all ages.
This type of concrete can be used for sidewalks and residential driveways.
To prepare the base cut the ground level to the proper depth to allow for the slab thickness.
Target an appropriate compressive strength one of the best ways to save money on rigid foam insulation installed under concrete slabs is to ensure the material is not over engineered.
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To achieve this strength the water cement ratio should be kept at 0 5 or less typically about a 5 inch slump concrete.
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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.
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.
Five to six inches is recommended if the concrete will receive occasional heavy loads such as motor homes or garbage trucks.
The typical concrete compressive strength used in residential construction is 2 500 or 3 000 psi although other strengths are available.
