My contractor says durarock should be cemented to the subfloor and that 1 1/2" roofing nails should be used (as opposed to screws) to put the durarock down. What would be the difference in using nails or screws? And is it essential that the durarock be cemented to the subfloor?
I've never heard of cementing the durarock down (does he mean mortar or construction adhesive?) but I'm sure it wouldn't hurt. Under no circumstances would I recommend using roofing nails to fasten down concrete board. Nails pull out screws do not and rigidity is key to durarock being successful. I would tell him to glue it down if he wants but nails are not acceptable. He is just looking for a way to cut corners and save time.
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