Browse Forums DIY, Home Maintenance & Repair 1 Jan 31, 2010 11:30 am I am getting ready to replace my Clip Lok roof (after 46 yrs, its getting near its "use-by"). At the same time, I want to install thermal insulation. I have set a target of at least R4 and now realise the thickest anticon blanket won't achieve that. Roofers (I'll call them #1 and #2) have quoted me for installation of anticon blankets. (#2 suggested batons over the blanket.) But they were not interested in messing about with batts. Then I think the next roofer (#3) gave me good advice when he said that only batts would achieve the standard I want. Then the last one to quote (#4) suggested that it would be most cost effective if I buy the batts and shove them in myself after he removes the old Clip Lok. Of course new sarking or blanket of some sort is still required. None of these guys actually looked at the spacing of the joists. So here is my problem: The joist spacings alternate between 600mm and 700mm because of the way the timbers overlap. The most common batt width is 580 mm. So if I use that width I will have gaps. The best idea I can think of is to buy 580mm R4 glass batts (cheaper) and tear up poly batts (more exy but easier to work with) to fill the 20mm and 120 mm gaps. You guys must have some better ideas. Thanks. Over to you. Re: Ceiling Insulation - Flat Roof Joists 2Feb 02, 2010 9:28 pm batts and poly sounds like a reasonable plan. What climate zone / area are you in? Other options of greater than r4 for that thickness are available, but are also way more expensive. Re: Ceiling Insulation - Flat Roof Joists 3Feb 03, 2010 8:52 am Thankyou Yak_Chat I am in Melbourne where I understand the minimum recommended is R3.5 but best practice is R4. Everything involves some compromises unless you are prepared to spend extra Thousands. I am planning to have a look at building blankets today since that would be neater. How do you slit a blanket into thinner strips? Can it be done on the roll or is it back to my trusty Stanley Knife with the building blanket laid out in the driveway? Cheers Re: Ceiling Insulation - Flat Roof Joists 4Feb 03, 2010 11:44 pm Haven't done it - but I'd think that trying to do it on the roll would be a tough call - so I'd roll it out, place down a strip of wood underneath and using a stanley knife would be my approach too. Plus gloves, mask and overalls Cold shower afterwards too. Hot water opens the poores - cold water closes them, to wash of the itchies. Re: Ceiling Insulation - Flat Roof Joists 5Feb 04, 2010 9:22 am Thanks Yak_Chat. I've got some really aggressive scissors too, so I will give them a try. We are having a bit of hot weather, so it may be a few weeks before I get it done. I will post the results. Anybody else want to share their experience with this? Cheers. Re: Ceiling Insulation - Flat Roof Joists 6Feb 08, 2010 4:03 pm Hi, Can some one give me an advise on Ceiling Insulation. I m building a double story and my house is very close to the completion. I am building in Melbourne. So a good insulation is a must. Only one month work is left. According to the builder the ceiling insulation will be done at the final stage. According to my contracts, I have below specifications: Blow in cellulose fiber between ceiling joists to total R4.2 using Energymasta cellulosik ceiling system Ultra 150, or similar insulation material to be selected by the builder in accordance with AS4859. Builder said they are going to blow in the insulation through the joists and it will fill up all the gaps between roof and ceiling. I am sure this will give a good insulation rating, but my worry is on how good to have this gap filled in with insulation. I think the insulation material have some fibre as well. Builder said there's no way for this fibre to come through air vents as all the ducts are properly covered. Can some one please tell me how safe it is to have this kind of insulation. Is it secure with down lights. I know that the holders of the down lights are getting very hot. When checked with builder, he said that down lights are covered with some kind of a holder and won't leak much heat from that holder. Please give me some advise. Thanks. Hi All, about to commence a bathroom renovation and need some advice on subfloor works. Current subfloor is hardwood T&G floorboards on 90x45 joists, but intention is to… 0 5821 Thanks for all replies. I just noticed now the pictures I added to post right on top of page were wrong. I attached pictures showing "current" and my "suggested" floor… 9 14627 Houses have been framed on floor joists since settlement, chipboard flooring is only around for 50 years or so, so why would it not be satisfactory? However exercise skill… 3 16815 |