Browse Forums Renovation + Home Improvement 1 May 26, 2015 6:44 pm We are doing a home reno and hope someone can help me with regards to our insulation. Do the insulation properties deteriorate with age, example if the insulation is about 20 years old and seems to be in quite good condition, would it still retain it's value if re used. Or should we definitely replace it with new insulation? Thanks in advance Re: Insulation properties 2May 26, 2015 6:55 pm I'm betting it stopped doing its job a few years ago. They all seem to settle down and 'shrink' in thickness through the years. Do you know what R rating is was originally ? if you do, measure its thickness and compare it to the specs of new batts of the same rating... I'm betting it's quitely likely to be only half the thickness. Owner Building at Jimboomba Woods in Logan City Qld. Blog : http://bandlnewhomebuild.blogspot.com H1 thread : viewtopic.php?f=38&t=68283 . Re: Insulation properties 3May 26, 2015 7:37 pm As per bpratts comment above , you are talking glass wool batts aren't you ? If it was originally 100mm thick then it was probably R2.0 but if it has shrunk or settled to 75mm thick for instance , it is probably equivalent now to R1.5. There is nothing wrong with placing another layer of batts over the top of the existing as long as you don't put them directly over any lights below. Stewie Re: Insulation properties 4May 26, 2015 8:01 pm Stewie D As per bpratts comment above , you are talking glass wool batts aren't you ? If it was originally 100mm thick then it was probably R2.0 but if it has shrunk or settled to 75mm thick for instance , it is probably equivalent now to R1.5. There is nothing wrong with placing another layer of batts over the top of the existing as long as you don't put them directly over any lights below. Stewie Yes Stewie they are glass batts, I don't know the original R rating, but they still seem fairly thick comparable to new R2.5 batts made today, my builder was going to re-use them but I want new batts as I question whether old batts would still be energy efficient etc. They are only in the walls, have been cut up into all sorts of pieces to re-use them and stick them back in a new wall cavity, which I would also think diminishes the effectiveness the more you cut them up? Is that correct or not? Thanks guys Hi, just need to ask if anyone build with Central Properties in Victoria. Thankd 0 4009 I am saying that double brick has similar thermal performance due to thermal mass effect. It will be still very interesting to see the state of your framing after 10-15… 10 29662 Hey guys building a new place through a volume builder and just wondering if i should complain to the site supervisor as we just had plasterboard installed. Looks like… 0 11240 |