Wide plank floor adhesive help
We are installing 750 square feet of 6" wide plank hickory flooring over plywood and need to know what is the best adhesive to use. The flooring was expensive and we don't want the installation to be compromised by using the wrong adhesive. My brother in law who is installing, says construction adhesive would be fine...but the company we purchased the wood from says we should buy glue from them at $1 a sq ft. The company says it should be a "full trowel glue down". We're not sure what brand of adhesive the company wants to sell us. Should we go with their adhesive? Is there an ideal adhesive that we should use? We feel a little uneasy about the company's recommendation...feels a bit "pushy", but if that is the cost of the adhesive, then we're fine with it. Can anyone recommend an appropriate adhesive for this job?