What is the best underfloor insulation type for radiant floor heat?

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What is the best underfloor insulation type for radiant floor heat?

David Irwin Published: July 12, 2020, 6:48 a.m.Last updated: July 13, 2020, 11:46 a.m.

Hi I am planning to retrofit our 1960s 3bed semi here in Ireland.  We have a suspended timber floor and I intend to lay electric underfloor heating under laminate flooring.  Can you help me choose the best type of insulation (both underlay and overlay of the electric heating system).  My main concerns and fire and offgassing.  (ie; which insulation will not give off toxic gasses especially as it is heated by the underfloor heating system?).

Many thanks indeed

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