I have read in this forum, that 18 gauge cleats are better than 16 ga when using 3/8" engineered or bamboo.

What about for a thicker 3/4" engineered. Does the same rule of thumb for 18 gauge apply?

I am going to install about 1000 sq ft of that 3/4" engineered by a brand called vintage, solid sawn. The instructions of the product specify "18 gauge (recommendation only)". On their standard 3/4" domestic, they also recommend 18 gauge to reduce "dimpling", which i am assuming many would ignore.

I am hesitant to buy one of the 18 gauges, because the price ($500+ plus tax) for me is too high in comparison to 16 gauge, however, if it is "highly recommended" to do the job properly by the pros here, i would get it. I would rent one just for this one job, but my local main rental store does not supply 18ga.

would you recommend the 18 gauge for this application, or is the company trying to be too overprotective

thanks for your help!
-b

I'd feel perfectly comfortable using a Bostitch MIII cleat nailer or any othe 15 ga for that thick of an engineered. But you know if theres any dimpling going on your on the hook for it. But the dimpling can be controlled by adjusting the pressure.

I wanted to ask a follow up question about structure/detail of my floor.

First I want to say that, yes, i understand that a nail down floor will severely reduce acoustical performance of the product. I will not float or glue this floor.

My joists are 12 inch O/C below..
3/4"x6" diagonal plank subfloor.. to be screwed down below..
1/8" acoustical/vapor combo underlayment below
3/8" plywood underlayment below
3/4" engineered plank hardwood.

1. Should the acoustical/vapour layer be below the finsihed hardwood or the 3/8" plywood? does it matter?
2. Will the underlayment affect the stability of the levelness of the floor

thanks.