Browse Forums Heating, Cooling & Insulation 1 Apr 04, 2011 3:35 pm Hi folks, I installed R2.5 or R3.0 (can't remember which) in my South Hobart weatherboard home's roof 10 years ago over the top of really old, thin insulation between the joists (guessing R1.0). The gov.au recommended insulation for us is 4.1. As we were having a new roof put on, I decided to get them to remove the existing insulation and replace it with R4.0 between the joists, and layer the old stuff on top, for a few reasons: - removing the bottom layer would identify any issues with the ceiling (whether dead rats were slowly decomposing into it etc) - having R4.0 between the joists would be the best foundation layer of insulation, and hopefully the older layers on top would add R1-2 and cover the gaps over joists. - I could be confident the R4.0 were installed properly everywhere, due to the ease of installation while the roof was off (as I couldn't get everywhere when I did it with the roof on). Whether or not my thinking was sound on that, the actual installation seems to leave something to be desired, but I don't know if I'm being too picky. I have read a 5% gap in insulation coverage means a 50% loss of effectiveness. I assume that means 5% when totalling small gaps, rather than one big uninsulated area. In a short look in my roof space, I've noticed: - a few intersections where 20cm square areas are uninsulated, leaving the ceiling visible - insulation goes to the intersection of the roof tin almost everywhere, except two areas about 1m x 1m where the eaves are overhanging the front and back porch. Does it matter that sections of the roof overhanging external areas are uninsulated? - quite a few gaps where batts do not butt up against the end of the joist space (eg. by up to 5cm) - they don't seem to have consistently cut bigger batts to fit smaller end spaces. - a 1m x 1.5m uninsulated area in the middle of the roof where wooden slats are nailed in to create a platform for the old header tanks (the tank is no longer there) - I would have thought batts should have at least been laid on top. -the 15 year old electric cabling which used to be ****** on top of the batts is now mostly underneath them. The roofers were great with the actual roof, but the insulation installation only took one of them a few hours to do, and I'm thinking it's not good enough for the extra $1200 for batts and labour it cost? Appreciate any comments, B. My garage door has started playing up recently. Sometimes (and getting more frequent) when I press the button to open it, it wont. The motor is an ATA GD0-6V3. Red and… 0 2707 Being an owner builder is no walk in the park. It’s a challenging endeavour that requires dedication and hard… 0 10443 I need to replace the worn mohair seal on my sliding window, but I can't get access to the end to slide the old one out & push the new one in. I could probably rip the old… 0 5223 |