Browse Forums Heating, Cooling & Insulation 1 Sep 09, 2009 1:24 pm I have the plasterboard off in a few of the rooms of my house at the moment and while they are off I would like to put some insulation on the external walls. The external walls are weatherboard and the studs are only 70mm. Unfortunately most insulation batts are 75mm. The only ones I have found which will fit in my walls without compression are Bradford SoundScreen R1.6 batts which are 60mm thick. Are there any other options other than putting in the SoundScreen in all the walls? Should I apply a silver foil to the back of the weatherboards before putting the soundscreen in (I read you should have a 25mm gap between the foil and the insulation for it to be effective, I'd only have a 5-10mm gap). Also, I have some left over roofing insulation (it is a roll which is put down underneath a tin roof. 75mm thick and has foil on one side). Can this be used anywhere in my walls or will the same problem occur regarding compression? If the roofing insulation will be useless on the external walls due to compression is there anything to stop me from using it on the internal walls as a type of sound barrier. Sure being compressed it won't work as well from a thermal perspective however hopefully the sound properties of it will still apply (I have 50m of the stuff so I'd like to find a use for it somewhere). Re: DIY - Insulation (70mm studs) 4Sep 09, 2009 11:46 pm Given the gap limitations I'd do the following. Put in perforated foil against the boards to stop moisture from the weatherboords absorbing into the batts. if you can not find or afford batts that fit - then while compressing them is not ideal, but if price is an issue, then do what you can afford or use wht you have will be better then zero. and re the internals, no major issues again re compressing what you have. Again not ideal, but hey better than throwing it away. Hope this helps. Re: DIY - Insulation (70mm studs) 5Sep 10, 2009 8:45 am Thanks for the comments guys. So having foil with 10mm gap would not be a waste? I am thinking I will just fork out and get the 60mm sound screen. Although it costs a little more it would be handy in quieting down the noise from the neighbours anyway and will work better than R1.5 compressed (Soundscreen is R1.6). What should I be looking at in a foil (is it called sisilation?) Re: DIY - Insulation (70mm studs) 6Sep 10, 2009 11:02 am deltoid I have the plasterboard off in a few of the rooms of my house at the moment and while they are off I would like to put some insulation on the external walls. The external walls are weatherboard and the studs are only 70mm. Unfortunately most insulation batts are 75mm. The only ones I have found which will fit in my walls without compression are Bradford SoundScreen R1.6 batts which are 60mm thick. Are there any other options other than putting in the SoundScreen in all the walls? You could use polysterene boards insulation, it's much more efficient than batts, but more expensive. Or you may consider a concertina type reflective insulation, slightly better than reflective foil. With only 70mm of wall, reflective foil isn't the best option in my view, but sarking/wall wrap is a good idea as protection against the moisture. Breathable membrane (with tiny holes) is recommended. Download http://au.wrs.yahoo.com/_ylt=A0oGkzB_T6hKbAsAEKML5gt.;_ylu=X3oDMTE1MHJkZzU4BHNlYwNzcgRwb3MDMQRjb2xvA3NrMQR2dGlkA0FVMDMzNV8zMzU-/SIG=12u77ojl7/EXP=1252630783/**http%3a//www.timber.org.au/resources/Rvalue1%2520Edition%25202%2520Walls.pdf for reference. Chris My father rode a camel, I drive a car, my son flies in a jetliner, his son will ride a camel.Saudi saying Re: DIY - Insulation (70mm studs) 7Sep 10, 2009 11:50 am Thanks for the replies everyone. We get a bit of noise through the walls from one neighbour due to the houses being close to each other and them having young children so we thought some sound proof insulation could help as well. Not only that R1.6 SoundScreen is only 60mm thick. So the plan is to put R1.6 SoundScreen in the external walls and use packing tape to secure it in place and make sure that it does not touch the external walls. I talked to CSR Bradfords about it and they said not to apply a moisture seal (because the walls are already in place the seal won't work as it needs to completely cover the wall (studs and all)). They said to just make sure I leave a small air gap between the insulation and the external wall (hence why I will use packing tape to secure it in place and hopefully have a 10mm gap) So we are going to do that. Then use the insulation roll we already have to insulate the internal walls to lesson noise between rooms and will also use it under the floor to prevent noise transfer there as well (house is raised 2m off the ground and we get a bit of noise through the floors as a result). Sound good? Assuming the structure of your cabinetry is good then I would DIY everything as follows: - replace your counter tops entirely, - replace all drawer runners with soft close… 1 4782 Re my second point – yes exactly. And often it may take additional time if the manufacturer recommends no more than X meters… 3 5642 |