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Hi guys, would be delighted to hear back on whether I it would be prudent to include insulation on the "original" floors of a renovation. Architect has not included any for these parts as it will not be checked by building control. With c/h pipes laid on top of the original concrete 100mm floors it will involve cutting the insulation around the pipework and in some places burying the pipework in the ground to facilitate the insulation. Currently considering NOT to include insulation. Newly Built Ground Floor Extension Areas (these will be checked by building control) Planning on using 75mm Kingspan K3 insulation on newly built front and rear extension ground floors with 20mm insulation turned up at edge on 1200 guage polyethlene d.p.m. with 40mm isocrete flow screed which is being linked through with d.p.c. on 100mm thick concrete floor (original floors of building). Need to achieve 0.22u value. Have 115mm build up available = 40mm flow screed and 75mm Kingspan K3. Original Floor Areas I have 70mm build up (excluding floor coverings) available on the 100mm concrete floor. There are radiator pipes sitting on this 100mm concrete floor with some of the connection pipes rising to 30-40mm in height. Thinking of putting 30mm Kingspan K3 insulation on top of this 100mm thick concrete floor and then using 40mm flow screed which will link through to the new parts of the building. 1. How effective will 30mm K3 be overall in terms of insulation? 2. Will the flow screed work well with this amount of insulation? 3. Is isocrete flow screed the best route to take (i.e. has a lower build up requirement than sand and cement which fit better with my build up limits) Any comments most welcome - many thanks in advance.