Browse Forums Heating, Cooling & Insulation Re: I want to increase my Wall R rating without blowing $$$ 21Aug 23, 2009 10:58 pm yak chat, sorry to ask again, about ceiling, is it worth to upgrade the ceiling insulation from 3.5 therma blow wool to 4.0 ? does it make huge difference ? now i am analysing and calculating my option, best bang for the buck, to increase insulation. my option: currently what i have: - Reflective foil R1.5 - Ceiling therma blow R3.5 - Normal glass (window) what i want: Walls Glasswool batt+R.Foil (R2) or Rockwool batts+R.Foil (R2.5) Ceiling R4 insulation (from R3.5) Window Double glaze this most expensive, (but probably most effective?) although probably for double glaze, i'll be looking for glass towards South and East area only, where it needed most. i am start feeling, i like to sacrifice even my evaporative air cooler, if this insulation can really help to reduce the winter cold, or the summer heat. Final stage Re: I want to increase my Wall R rating without blowing $$$ 22Aug 24, 2009 12:14 am d3p yak chat, sorry to ask again, about ceiling, is it worth to upgrade the ceiling insulation from 3.5 therma blow wool to 4.0 ? does it make huge difference ? The % improvement to change is (4 - 3.5)/3.5 = 14% It becomes a law of diminishing returns. You may save between $20-80 in heating cost per year from upgrading. It depends on multiple factors Here is a graph illustrating the benefits: http://www.members.optusnet.com.au/fric ... enefit.pdf Your savings are better if: a) your heating requirements are higher than average b) you live in a colder than average climate c) your electricity costs are higher than average Just to makea point about this, an approach that some people have found sucessful in negotiating these rises down, Is to provide some workings to the builder, specifying… 4 81715 Fair Trading can issue orders to rectify and complete but once the matter goes to NCAT these orders are automatically vacated. You will have to terminate contract and sue… 21 29709 How are you doing Ben? Extremely interested in hearing what you are doing or plan to do! 12 15148 |