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1970's Build U Values
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 1.2 DG Windows/doors uPVC 3 Thanks again for all help given previously Phil |
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