Hi, it's been a while since I've posted here, been very busy building my house. I'm just going to start hardwood and thought this would be the place to visit.

I have hydronic radiant heating in 1 1/2" of gypcrete, I layed 2x2 sleepers so I could nail it down for the most part, there are a few areas I may have to glue. I applied the Maxxon Overspray sealer which I think is sufficient with my engineered flooring but I was wondering if I should use a foam underlayment. I thought this may trap moisture if there is any which I figure could migrate through the 2x2's and I'm not sure if it will really be any help, I think it may even hinder the heat transfer.

Any suggestions?

Thanks,
Sean