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I have a new conservatory nearing completion and I am going to have an underfloor electric heat mat installed.
The floor of the conservatory currently consists of a concrete raft, then Kingspan insulation (not sure of its thickness but I would say about 75mm), then a 75mm cement screed. Is it necessary to also install a 6mm insulation board on top of the screed before laying the heat mat? I want to have the job done properly but obviously dont want to waste money on additional insulation if it's not necessary.
Thanks
The floor of the conservatory currently consists of a concrete raft, then Kingspan insulation (not sure of its thickness but I would say about 75mm), then a 75mm cement screed. Is it necessary to also install a 6mm insulation board on top of the screed before laying the heat mat? I want to have the job done properly but obviously dont want to waste money on additional insulation if it's not necessary.
Thanks