Slab and Floor Repair

Carbon or Glass FRP are very effective in repair and strengthening of slabs and decks. FRP can be designed to increase the live load capacity of the slab or restore the original capacity that has been reduced by corrosion of reinforcing steel. Depending on the project conditions, strengthening can be achieved by applying the FRP to the top or bottom surface of the slab. We have also developed solutions for increasing the punching shear capacity of slabs around columns.  Another common application of FRP is to reinforce the areas around an opening that may have to be cut in a slab (e.g. for stairways, etc.).

Thin sheets of FRP with a thickness of approximately 0.05 inch (1.3 mm) can be applied similar to wallpaper to strengthen the slab.  These materials cure within a day and reach a tensile strength three times that of steel.  QuakeWrap engineers will determine the number and orientation of fibers in each layer of the FRP fabric and will provide sealed engineering drawings for such repairs.

Features & Benefits

Advantages of FRP for strengthening slabs include:

  • Increases flexural strength for both positive and negative moment regions in the slab
  • Increases slab stiffness and reduced deflection at service loads
  • Reduces crack width for enhanced durability
  • Covering a fraction of the slab surface with FRP may be sufficient for strengthening the entire
  • slab The 0.05 inch (1.3 mm) thick FRP can be easily hidden under floor coverings
  • FRP can serve as waterproofing membrane as well
  • No reduction in overhead clearance is caused by application of FRP (e.g. in parking garages)
  • Lower cost for FRP compared to strengthening with conventional methods


  • Apple Computer Store, Carbon FRP Strengthening Of Concrete Slabs, Glendale, CA
  • Concrete Slab Strengthening in Industrial Plant, FRP Strengthening of 16-Inch Concrete Slab in Power Plant, Duluth, MN
  • FRP Repair of Fire Damaged Power Station, FRP Repair of Fire Damaged Power Station, Peoria, AZ
  • FRP Strengthening of Concrete Slab in Medical Center Tucson, Strengthening of Concrete Slab under MRI, Tucson, AZ
  • Georgian Towers, Punching Shear Reinforcement with FRP, Silver Spring, Maryland
  • Holy Cross, Slab strengthening around opening, Silver Spring, Maryland
  • LA Museum of Natural History, Seismic Retrofit of Historic Museum with Carbon FRP, Los Angeles, CA
  • Plaza de Diego High-rise, FRP Retrofit of Concrete Floor System in High Rise Building, San Juan, PR
  • Providence Hospital, FRP Strengthening of Concrete Slab in Health Care Facility, Anchorage, AK
  • St. Josephs Medical Center, Strengthening Concrete Slabs with NSM Carbon FRP Laminates, Phoenix, AZ
  • Trump Grande Condominiums, FRP Repair of Concrete Slab in High Rise Building, Sunny Isles Beach (Miami), FL