Siding Backer Strips

The solution for replacing old asbestos siding
Siding Backer Strips

Why GAF WeatherSide™ Fiber-Cement Siding?

Perfect design and easy installation with virtually no maintenance makes GAF WeatherSide™ Fiber-Cement Siding the right choice to closely match and replace old asbestos siding.


  • Classic Look:  WeatherSide™ Fiber-Cement Siding possesses a distinctive beauty unavailable in any other siding products on the market. 
  • Unique Design:  Virtually identical in size and shape to millions of old non-existent siding shingles make it the perfect replacement solution.
  • Easy Replacement:  After properly removing the old siding,1 simply nail the WeatherSide™ Fiber-Cement Siding in place and paint.
  • Fast Installation:  Unlike some other fiber-cement siding products, WeatherSide™ Fiber-Cement Siding does not require caulking at every joint.
  • Safe:  WeatherSide™ Fiber-Cement Siding contains NO asbestos.
  • Pre-Primed:  Comes with a flat white primed surface, ready for painting. 
  • Durable:  Helps resist warping, denting, rotting, expanding, contracting, and termite infiltration. 
  • Peace Of Mind:  Backed by a 25-year ltd. Warranty.


The perfect finishing touch to complete the outside corners of your GAF WeatherSide™ Siding job. Each backer strip completes one course of siding.

  •  9" Siding Backer Strips:  For use with Profile 9" Shingles
  • 12" Siding Backer Strips:  For use with Profile 12" and all Purity Shingles
  • 14" Siding Backer Strips:  For use with Profile 14" and Emphasis™  Shingles

Where Can I Purchase GAF WeatherSide™ Siding Backer Strips?

  • Option 1: Contact Your Local GAF Distributor or The Home Depot®
  • Option 2: Buy WeatherSide™ Fiber-Cement Siding Replacement Siding Online at Each pack comes with enough backer strips to cover approximately 1 square of siding.


1We recommend that any removal and disposal of asbestos-containing products be done by a professionally trained asbestos removal contractor.
2See WeatherSide™ Limited Warranty for complete coverage and restrictions. 

Available Sizes

Note:  Product sizes, dimensions, and widths are nominal values and are subject to normal manufacturing/packaging tolerance and variation.
  • Pieces/Bundles
  • Dimensions
    3 in. x 12 in. (76 mm x 305 mm)
  • Pieces/Bundles
  • Dimensions
    3-1/8 in. x 14 in. (206.4 mm x 356 mm)
  • Pieces/Bundles
  • Dimensions
    3 in. x 9 in. (76 mm x 229 mm)