Browse Forums Heating, Cooling & Insulation Re: Roof insulation and building code 15Sep 21, 2020 3:43 pm Because there are still many little gaps around the air con, vents, joists etc etc Re: Roof insulation and building code 16Sep 21, 2020 4:00 pm Coldallthetime Because there are still many little gaps around the air con, vents, joists etc etc When you apply roll, you generally would have to seal with polyutherane the gaps around penetrations. Small hard-to-seal type of gaps are still okay, they won't be really adding significantly to the overall thermal loss/gain (may be up to 5% tops). You will certainly lose much more than that (30%-50%) by placing batts between joists due to thermal bridging effect. Re: Roof insulation and building code 17Sep 21, 2020 4:06 pm I'm a little confused... So where does the roll/blanket go? over the joists? I had wondered about the joists not having any insulation over them at all, I was thinking ideally batts up to the height of the joists and then some more insulation, batts or whatever options there are, over the top. Re: Roof insulation and building code 18Sep 21, 2020 4:10 pm Over the joists, correct. Insulation in batts will certainly add extra points. But what about downlights, electrical cabling, etc.? Make sure you do not create fire hazard. I would be only running electrical cables in conduits and would need to cover downlights with special domes in that case. Re: Roof insulation and building code 19Sep 21, 2020 4:12 pm OK right, so is the roll/blanket the same as batts just not cut up into pieces that fit between the joists or made of different materials? Re: Roof insulation and building code 20Sep 21, 2020 4:19 pm Similar or same materials. It is continuous insulation, hence, reduces thermal bridging. You can also run 2 of them on top of each other for better insulation. https://pricewiseinsulation.com.au/prod ... il-facing/ Hi All, see above image. The required setback from the rear boundary in my case is 5m, as you can see the shape of the site and location of the boundary is slightly… 0 8451 CDC Housing Code 3 When to apply Floor Area external face of wall vs Gross Floor Area internal face of wall. Reading thru CDC Housing Code 3, lets take a lot 915sqm.… 0 16553 |