Attachment to Cement-Fiber Decking

[CptKlunk1]

Hi All,
I have a project that requires the attachment of a rooftop solar array to a cement-fiber roof deck similar to a PetriCal product. Essentially wood fibers bound with Portland Cement. The deck is approximately 3" thick. Has anyone run into this type of decking and what did you use for fasteners? I was considering a thru-bolt connection with an 18 gage steel backing plate but I can find no documentation on allowable shear strength or screw pull out values. Thanks for the help.

 

[a2mfk]

is it something like this?

http://www.tectum.com/roofdeck.htm

 

[CptKlunk1]

Very similar to the Tectum Deck. I've checked their web site and didn't find anything regarding attachments directly to the material, unless I missed it.

 

[a2mfk]

I would assume you do not want to attach to that directly unless you get specific guidance from the manufacturer that says otherwise...