Browse Forums Building A New House 1 Nov 29, 2020 8:08 am [ltr]Hi, We are planning a KDB on a canal block in SEQ. We have plans to build a single story 270m2 house. Our problem is that due to council flood levels we need our FL roughly 600mm above our original FL (current old house). Prior to hiring a Hyd Engineer, our 1st slab design was going to be 600mm block and back filled slab. But due to the Hyd report (flooding assessment) the block would require too much excavation to compensate for the solid slab added to the block. The team then proposed a steel bearer and joist system that would elevate the house and therefore require no excavation. We have since received estimates on this system ($40K over the original cost of the concrete slab). We are now trying to justify why a steel bearer and joist system would be $40K more then the concrete slab on ground? Has anyone had this experience or would anyone like to share their thoughts on why the the bearer and joist system came in so high? Also what are the pro`s and con`s on both systems?[/ltr] [ltr]Note: reason`s for the steel sub floor system instead of timber is that we are in a high termite prone area and on a salt water canal. Our old house we live in has also been home to termites for years![/ltr] Re: Concrete slab v steel bearer and joist system? 4Nov 29, 2020 6:00 pm CLP [ltr]Hi, We are planning a KDB on a canal block in SEQ. We have plans to build a single story 270m2 house. Our problem is that due to council flood levels we need our FL roughly 600mm above our original FL (current old house). Prior to hiring a Hyd Engineer, our 1st slab design was going to be 600mm block and back filled slab. But due to the Hyd report (flooding assessment) the block would require too much excavation to compensate for the solid slab added to the block. The team then proposed a steel bearer and joist system that would elevate the house and therefore require no excavation. We have since received estimates on this system ($40K over the original cost of the concrete slab). We are now trying to justify why a steel bearer and joist system would be $40K more then the concrete slab on ground? Has anyone had this experience or would anyone like to share their thoughts on why the the bearer and joist system came in so high? Also what are the pro`s and con`s on both systems?[/ltr] [ltr]Note: reason`s for the steel sub floor system instead of timber is that we are in a high termite prone area and on a salt water canal. Our old house we live in has also been home to termites for years![/ltr] All up I have 163m² of flooring system. Material cost including engineers certification and delivery was $22800 2 ½ years ago. On top of that there was 2 days excavation to drill peer holes, and about $3800 of concrete. I put it up with the help of my brother-in-law as labourer, for which I will be ever grateful. Termiflor and scyon sheets screwed and glued on top, set me back about $5000 and another $6700 of ironbark decking and about $2000 for fasteners. Because our design had post centres at 2500 to align with other posts in the same area, I had to throw $4k in for galvanised structural steel All up that's about $41k without labour costs. Hope that helps with your comparisons We are Re: Concrete slab v steel bearer and joist system? 7Jun 27, 2023 10:27 pm Hi Thylacene, We’re planning a knockdown rebuild. Finished floor height needs to be 1.1m I was thinking about using the spantec system (with yellow tongue) but building designer says they are noisy to walk on compared to a timber subfloor. Have you found that your floor is noisy at all? Any creaking? Thanks Seconded; we just used these last weekend to build a small deck. They worked perfectly as we have bluestone in the area where we wanted to build so digging down was not… 8 9066 Hi Mrboh Just wondering if you have any BAL or flame zone issues on your block, as getting compliance with BAL requirements whilst doing bearers and joists is tough. Not… 1 8362 Hi I am wanting some opinions about the build of a steel shed I am going to get one about 4.5 x 2.5 m steel shed and the height will be about 2.3-2.4m high The one I am… 0 14442 |