Fasteners for 1/2" fiberock

[dwbarg]

Hello everyone. Been lurking for awhile but now I need a question answered. I was reading the instrucions on the fiberock and it said you could use 1/4" crown staples to fasten the fiberock to my 3/4" plywood for my floor. i was going to use screws, but the staples would be much faster. I wanted some opinions on using staples. Also, on tiling a floor is it necessary to tape and mud the joints of the cement board? Thanks

[cx]

Welcome, dwbarg. Please add a first name to a permanent signature line for us to use.

You need to refer to the manufacturer's instruction for information on joint treatment on their product. Most tile underlayment products do require that you fill and tape the joints.

If USG thinks staples are a suitable fastener, you'd have a good argument if it didn't work. I like screws in all subflooring applications, but that's a personal preference, not a requirement. I've never worked with Fiberock. I think you'll find the manufacturer recommends something thinner than the half-inch product for floor underlayment use, too.

Have you determined that your floor structure meets the required L/360 deflection requirements?

My opinion; worth price charged.

[dwbarg]

Sorry, i didn't mean 1/2" fiberock I meant 1/4". Yes, i am good on deflection. What type of cbu do you use?

[duneslider]

Read those instructions again. Last I read they say staples are no good for tile but are acceptable if used as an underlayment for vinyl flooring.

Roofing nails in a roofing nailer goes fast and is acceptable by USG.

[jadnashua]

And make sure to use the required thinset UNDER the cbu.