Our installation instructions address in floor radiant heat, but have not been tested over a unit with ceiling heat.
Unfortunately I am unable to make a recommendation for this application.
Radiant Heat Systems (all installation methods)
General Precautions and Recommendations Always use moisture barriers.
Engineered flooring can be successfully applied over in-floor radiant heat. Know the species you intend to use and how it may interact with radiant heat. Not all species are recommended for this installation, choose species highest in stability ratings for this application. Brazilian Cherry is not recommended.
Because of the wide array of systems on the market, each with its own features, please consult with your radiant flooring provider for recommended installation methods. Hydronic systems must include in-floor temperature sensors and an outdoor thermostat that allows the system to adjust the water temperature according to anticipated heat loss. Radiant heat contributes to the drying out of all woods. Use of a humidification system may be required to maintain the proper humidity level. The indoor relative humidity must be maintained between 30-50% year round. Failure to do so can result in edge cupping, squeaking delamination, splintering, or face checking.
Thank you for your question.
Answered on 1/9/2012 by customer care 2