Following previous message "Central Heating Design - Help Please", can anyone comment on U Values for the following features please? I have two sources of reference, the Screwfix site and Plumbing and Heating by Treloar. These seem to conflict and, when I research other sources, I find these don't tally with either of the above. Is there a definitive source for this information? If so can someone please confirm or revise the following feature values for me (W/m2 Deg C)?
Walls U Value
External Wall - 11" brick-block cavity uninsulated. 1 Internal Wall - plaster, 4.5" brick, plaster 2.2 Plasterboard, 2" eggcrate cavity, plasterboard 2 (guessed) External Wall - 11" brick-block cavity insulated. 0.7
Floors
Ground Floor - Solid Concrete
0.8 Int Floors - Floorboard, 8" joist, Plasterboard 1.7 (heat flow up) Int Floors - Floorboard, 8" joist, Plasterboard 1.5 (heat flow down)Roof
Pitched with felt - 100mm insulation
0.34 Pitched with felt - 50mm insulation unknown Flat roof - no insulation 1.2DG Windows/doors uPVC
3Thanks again for all help given previously
Phil