Installation Instructions
Allura Fiber Cement Siding Installaon Manual
36
Sheathings
Structural
For best results, Fiber Cement should be installed over plywood, OSB, or comparable
structural sheathing. Allura Fiber Cement Siding can be installed over braced wood or
steel studs in accordance with local building codes.
Non-structural
Installing Allura Fiber Cement Siding over non-structural sheathing, builder board, foam-
type sheathings, and gypsum board is also acceptable if the siding boards are fastened
to structural framing. Non-structural sheathing thickness in excess of 1” creates a
condition where Allura Fiber Cement Siding products cannot be properly attached
to the existing structural surface (e.g. framing members, steel studs, or structural
sheathing).
The easiest way to meet the fastening requirements for Allura Fiber Cement Siding is
to install strutural seating oer te nonstrutural seating oeer te all
assembly must be designed in such a way that the re-established structural fastening
surface (e.g. OSB, plywood, lathe strips, or 1x or 2x framing lumber) is sufficient to meet
the requirements of ICC-ES Evaluation Report ESR-1668.
Allura does not provide instructions for wall design or assembly that specifically
relates to the fastening requirements for re-establishing a structural fastening surface.
However, FastenMaster
®
provides two documents to assist in successfully re-
establishing a structural fastening system over non-structural sheathing. These reports
must be used in combination with ICC-ES Evaluation Report ESR-1668 to determine
attachment requirements.
Technical Evaluation Report (TER No. 1009-01) Use of FastenMaster HeadLok
Fasteners to Attach Cladding and/ or Furring to Wood Framing through
Foam Sheathing
Te c h n i c a l B u l l et i n : A t t a c h i n g E xt e r i o r Wa l l C o ve r i n g A s s e mb l i e s w i t h Fo a m
Sheathing to Steel Wall Framing
NOTE: The ICC report requirements for framing type must be adhered to so as to meet
the minimum requirements for fastening Allura Fiber Cement Siding.
New Construction
Fasten the sheathing securely to the studs according to local code requirements. Then
apply a weather-resistant barrier to the wall.
Remodeling
If you are covering old siding, there are three ways to prepare the surface of the
building for the new siding.