Browse Forums Building A New House Re: Colourbond roof worth $7k extra over polish concrete til 22Jun 18, 2014 6:00 pm Uh huh. When I was a kid, one of the houses I lived in was ~80 years old and had originally been built with a tin roof. Sometime in the 60s, (I think) the roof was replaced with (cheap) tiles; the trusses were sagging badly by the 80s. Not _safe_ but it hadn't fallen down yet when I saw it last year. Who knows what people will do one day? Land settled May '14. Building the PD Hoffman39: 5/11=site start, 13/11=slab pour, 26/11=frame complete, 10/12=roof on, 12/12=bricking started. Blog: http://jyndeira.net/blog/ Re: Colourbond roof worth $7k extra over polish concrete til 23Jun 18, 2014 7:22 pm Exactly my point. You don't know and quite frankly you probably don't care, but I'm of the opinion if you can afford a little bit of extra engineering then do it. I know I am with my build..opting for raft over waffle, upgraded 30MPa concrete etc. Re: Colourbond roof worth $7k extra over polish concrete til 24Jun 18, 2014 7:44 pm One item currently missed in this thread is the actual cost to change a completed design. If, for example a project builder has a complete set of plans, sections, material list etc prepared for one of their houses & a customer requests a change from colourbond to tiles or from tiles to colourbond, then the house must be redesigned with new sections, flashings, barge boards & fascia details due to the different timber sizes and weights. in addition engineering check are required on lintels sizes, jack studs, veranda beams & cyclonic restraints. Tiled roofs & colourbond roofs have different thermal properties & insulation requirements. Greenstar ratings need to be recalculated by an accredited greenstar assessor. The draftsperson will then need to redraw a lot of details based on engineering changes. New engineering calculations will be required for the trusses & cyclonic tie downs. All this work has to be paid for. The question is what is a fair price for this extra work. Maybe not $7k but closer to $2K (this extra work does not apply if the roof material is chosen and not changed when the detailed design commences). Note that if the roof has a lot of hips and valleys there is more material wastage and extra labour for a tin roof than for a tiled roof. Re: Colourbond roof worth $7k extra over polish concrete til 26Jun 19, 2014 11:20 am Crazyk Exactly my point. You don't know and quite frankly you probably don't care, but I'm of the opinion if you can afford a little bit of extra engineering then do it. I know I am with my build..opting for raft over waffle, upgraded 30MPa concrete etc. Trouble is you need to decide where to spend money. In the example you gave 30MPa is a waste of time and money for a slab. If you told me to upgrade the steel that I can understand. Also A raft slab isnt necessarily more expensive. Waffle slabs are chosen by builders as they are easier/quicker to build and estimate costs. Also in the examples I have seen the increased landscaping costs are then borne by the owner, since waffle slabs always have rebates higher than natural ground levels. Raft slabs can have them closer to ground. Colourbond roof worth $7k extra over polish concrete tiles? 27Jun 19, 2014 3:57 pm B star you are wrong. Don't say 30Mpa is a wast of money you have no idea. I worked in the concrete industry and can say that increasing cement qty actually increases concrete durability and reo corrosion inhabitancy. There are heaps of case studies to prove that statement wrong. In regard to more reo you will only get a benefit if you up gauge from say SL62 to SL72. Reo needs to be at the correct placement to add any strength. Reo in the middle of of a slab is useless. It needs to be in the tension zones. Waffle slabs are cheaper or builders wouldn't use them. Just remember this..."Time is money". So if it's quicker it's cheaper and there is also less excavation and concrete, all adding to a cheaper slab. Sorry that's all a little off topic Re: Colourbond roof worth $7k extra over polish concrete til 28Jun 20, 2014 8:36 am crazyk off course 30Mpa is better than 20Mpa the question is are you going to get all the benefit versus cost. Like you say- you are going to get better effect from better placed mesh. Remember concrete is stronger in compression and steel has better tensile strength. I have never heard of a slab getting squished like a sponge because it was to soft. Regards to more reo increase the guage is what I mean. But i do believe for perminately exposed surfaces like a a garage floor two layers instead of one may improve the chances of superficial cracks. Yes waffle slabs are cheaper(and quicker) for the builder thats why they use it. Its cheaper in time particularly. However there are a lot of costs that are bourne by the home owner later on. As a whole building as an owner builder I found the end to end construction costs the same for a raft slab. Infact someone I knew had engineering done for both types of slabs and quoted on both. As you say the waffle slab was cheaper by about 1000- 1500, so they went with this. However there was a bigger slope then they estimated so the future cost for soil removal alone was more than this later on. I builder may have just filled up the open space left onthe property with this left over soil. But off course the owner will need to pay more to get rid of it later on when driveways etc need to be dug out. Re: Colourbond roof worth $7k extra over polish concrete til 29Jun 20, 2014 11:28 am I've posted this before on this subject. It's a cost comparison done for the master plumbers re CB vs tiled roof costs. http://www.google.com.au/url?q=http://w ... 5hZC4zHSlQ Of special note on page 6 is the total cost for roofing a typical 213 sq m roof CB total including GST $ 9,272.78 Cost per sq m incl GST $ 28.69 Tiles total including GST $11,707.57 Cost per sq m incl GST $ 39.85 This was done in 2005 and from what I can find out the costs have kept pace with each other so the study is still valid Stewie Re: Colourbond roof worth $7k extra over polish concrete til 30Jun 20, 2014 11:37 am ^ That $2500 difference, call it (I dunno) a $3500 difference now, could very easily be swallowed-up by the difference in discount a builder has negotiated (eg. if they'd negotiated on tiles but not on CB), as well as extra cost in administration/design work when the default design needs to be modified. Re: Colourbond roof worth $7k extra over polish concrete til 32Jun 21, 2014 1:33 pm If you were designing the house with the exact roof you wanted from the get go the differences would be higher. With a sheet metal roof you could have the trusses at 900mm and still comply. A tiled roof and you couldn't have them any further than 600mm so there is the extra trusses to allow for. Then there are the beefed up lintels you would need over windows and doors allowing for the fact that a tiled roof comes in around 25kg per sq m and a CB roof is 10kg per sq m. Stewie Re: Colourbond roof worth $7k extra over polish concrete til 33Dec 11, 2014 10:39 am People only change from tiles to Colorbond, never the other way around. Colorbond does its job much longer. btw the trusses are the same for colorbond/tiles. The difference is they are just closer together. Re: Colourbond roof worth $7k extra over polish concrete til 34Dec 11, 2014 11:50 am B STAR People only change from tiles to Colorbond, never the other way around. Maybe this should say "people are only currently changing from tiles to Colorbond"? Being a fashion thing, it's probably not true in all of Australia, and in your area it may not be true by this time next year ... Re: Colourbond roof worth $7k extra over polish concrete til 35Dec 11, 2014 2:22 pm Forg B STAR People only change from tiles to Colorbond, never the other way around. Maybe this should say "people are only currently changing from tiles to Colorbond"? Being a fashion thing, it's probably not true in all of Australia, and in your area it may not be true by this time next year ... What I meant with this is usually people with old houses who have roofs that are no longer doing their job are really considering going for colorbond. I have seen a few people do this. Colorbond is an excellent product with the only possible complaint being the noise which could be eliminated by using blanket. I have had people question why I used colorbond. Until the first storm they had they realized tiled roofs are not very water tight. ahhh I changed my mind Next house I am definatley getting color bond they said. Re: Colourbond roof worth $7k extra over polish concrete til 36Dec 11, 2014 2:31 pm Colourbond is definitely worth it (in my opinion) over tiles but not for $7k. We weren't charged extra for Colourbond we were just given a choice. If you aren't to far ahead with your builder I would consider other builders, if they are charging you that much for Colourbond imagine how much other upgrades would be! Lexia Slim Twist with Beechwood Homes http://houseoflexia.blogspot.com.au/ https://www.instagram.com/natlyn7/ Re: Colourbond roof worth $7k extra over polish concrete til 38Dec 11, 2014 5:21 pm Our 65 yo house has the original concrete tiles. They're absolutely fine. We've lived here 25 years and no leaks. No problems Re: Colourbond roof worth $7k extra over polish concrete til 39Dec 11, 2014 8:07 pm No idea what the 70yo tiles were made of, but I do know they allegedly had a 60 year lifespan ... but they were still doing their job without any problems when we pulled the house down. Climate change means hail storms will be more prevalent in Sydney, however; I can see the point of that argument. Re: Colourbond roof worth $7k extra over polish concrete til 40Dec 11, 2014 8:38 pm TomCat Our 65 yo house has the original concrete tiles. They're absolutely fine. We've lived here 25 years and no leaks. No problems How do you know this for sure. I know someone with a roof that was perfectly normal but leaking (water spray) on a roof that is only a few months old. Your only going to notice really bad leaks and notice when its too late Cheers. The painted render is a bit chalky to the touch. To prepare the surface for best adhesion, what would you recommend? Also, given that there must be some… 6 8497 Do you have solar on the roof, because if its not a laying defect it looks almost like someone has been walking all over the roof in the mid section of the tile (weakest… 2 1925 Levelling compound Ardit is the best but buy a bag of sand and make sand dam to protect your wood floor 2 15252 |