Concrete Slab Specifications For Floors

History of concrete floor flatness and floor levelness.

Concrete slab specifications for floors.

The 4 inch pour of a standard slab is recommended for both garage floors and interior floors. Bre digest 522 parts 1 2 hardcore for supporting ground floors of buildings. To have specification for industry standard without manufacturer bias and produced in a timely manner. The irc requires that slabs be built with concrete with compressive strengths from 2500 to 3500 psi depending on the climate.

03 3543 bonded abrasive polished concrete floors. Its more than just forms and pouring concrete. Floor flatness levelnessone of the things that distinguishes a high tolerance floor is its f number requirement. Placed over a 3 4 base of stone stonedust sand whichever is local standard medium broom finish for slabs over 25 x 25 slightly rougher medium broom finish for smaller slabs to minimize tile migration.

Ground bearing concrete floor slabs should be at least 100mm thick including monolithic screed where appropriate. Ground bearing floors shall be of adequate strength and durability and use concrete mixed and reinforced as necessary to support floor loads safely and resist chemical and frost action. Ff and fl numbers floor flatness and levelness. Most residential projects only specify minimum concrete compressive strength.

Standard concrete floor slab thickness in residential construction is 4 inches. F numbers were developed in the 1980s to provide a systematic quantitative way to indicate the flatness and levelness of a concrete floor. If the contractor knows what he or she is doing and knows what the customer wants then the lack of specifications is probably a good thing. Five to six inches is recommended if the concrete will receive occasional heavy loads such as motor homes or garbage trucks.

To achieve this strength the water cement ratio should be kept at 0 5 or less typically about a 5 inch slump concrete. The higher the f number the flatter or more level the floor. Polished concrete appearance chart. Design community architects owners gcs concrete slab contractors.

Aci goes further and recommends 4500 psi concrete for garages floor slab. Polished concrete aggregate exposure chart. Floor levelness f l floor flatness f f classifying concrete floors based on flatness and. The international residential code irc lays out a series of requirements for pouring a concrete slab on grade.

To prepare the base cut the ground level to the proper depth to allow for the slab thickness. 4 slab of 3500 psi concrete. Industrial floor designresidential concrete slabs often have few design requirements to get between the contractor and completion of the job.