Browse Forums Building A New House 1 Oct 31, 2011 11:27 am Hi guys, I recently had a soil test done on my 650sqm corner block in Truganina. I was wondering if anyone has laid a slab on soil with similar classifications, and if so how much did it cost per sqm and was there any unexpected headaches? I plan to build a 30 square slab, it will be a double story home, ~45-50 square total. The report states the following: Description of the site: Virtually flat, local geology in the environs is Quaternary Basalts Site classification: Class P (AS 2870-1996) Characteristic surface movement (Ys), under normal condition has been estimate in the range of 40mm to 70mm. Due to the amount of filling on some sections of this site, the site has been classified as Class P. Recommendations for slab: Raft slab (I won't go into this). Waffle slab (this is the preferred option): An engineer designed waffle slab exceeding class H (AS 2870-1996) waffle raft is recommended on this site. The slab should have a min concrete depth of 385mm with 3-N16 bars obttom and SL92 slab mesh top. Due to the nature and condition of the filling on this site, use of concrete piers to support the waffle slab is recommended. Construction techniques: 1. Scrape min depth fo 100mm and remove vegetation and roots. 2. Cut site to form level bench 3. Place layer of quary product of building area which shall extend 1m outside the building line 4. Set up string lines, edge boards and foam work 5. Plumber shall lay waste pipes below ground at min grade. Risers to be staked firmly 6. Prepare waffle raft within formwork, in accordance with footing plan and details. Use min .2mm approved plastic membrane under waffle pods and ribs. 7. Proper site draining is important for reactive sites such as this. Recommended that ground surface immediately next to the perimeter be graded away at approximately 1:50 within at least 1500mm. A concrete path is further recommended. 8. Construction joints should be provided at a max spacing in order to minimize distress on the brick work caused by possible foundation movements. Depth to clay: 1st hole (block front): 650 mm 2nd hole (block middle): 350mm 3rd hole (block rear): 450mm Soil test back - but what will it cost? 3Nov 01, 2011 12:10 pm Would have said more, ours were 45k, 650sq, h class slabs, retaining wall and peering to one side- 1.4m fall. Re: Soil test back - but what will it cost? 4Nov 01, 2011 12:49 pm My guess: 40-50k. Is this a sweep, a la Melbourne Cup? Really, any ballpark estimate you get here is useless, just wait till the builder gives you the price. 23 Aug 2011: Land settlement 14 Sep 2011: Block levelled 20 Oct 2011: Slab 3 Nov 2011: Frame 10 Feb 2012: Handover http://s1098.photobucket.com/albums/g372/Dazzab6/ We were lucky in that our old house was so small (86 square metres) compared to the new house, they were able to take enough readings around the old backyard house before… 8 37142 Three options 1 Ask the liquidator 2 Find another PD customer and ask the source of their report 3 Pay for new report 3 12336 Hi Building Expert, Thank you for the feedback, much appreciated, there is also a code of conduct for building surveyors which they need to follow as well. I am looking… 4 3671 |