Browse Forums General Discussion 1 May 24, 2021 12:30 am How difficult is it to measure the depth of footings on a waffle slab? Is there an easy way to do this by digging down next to the external walls? I have a house that is suffering with slab heave and during a recent conversation with the concreter who poured our slab, he said that my slab was a class M on H2-D soil and stated that he didn't know how my builder was getting away with this. The slab design shows H2 (still inadequate) but from what this concreter told me, it could be even worse than that! Any ideas? Re: Measure footing depth in house suffering with slab heave 2May 24, 2021 6:39 am Cracking everywhere How difficult is it to measure the depth of footings on a waffle slab? Is there an easy way to do this by digging down next to the external walls? I have a house that is suffering with slab heave and during a recent conversation with the concreter who poured our slab, he said that my slab was a class M on H2-D soil and stated that he didn't know how my builder was getting away with this. The slab design shows H2 (still inadequate) but from what this concreter told me, it could be even worse than that! Any ideas? Where are you located? if you're in Sydney I can give you the number of a great engineer who is brilliant at identifying why buildings crack and coming up with rectification solutions. We use him on our older homes that need renovation. Let me know Cheers Simeon Simeon McGovern Affordable Custom Homes, We design and build to your budget Ashington Homes www.ashingtonhomes.com.au Re: Measure footing depth in house suffering with slab heave 3May 24, 2021 8:48 am Hi @Cracking everywhere Yes-nothing more fancy than a couple of shovels and a bar is needed. The geotech firm should have recommended this early on. If not mentioned get another one. You can also probe using a dynamic cone penetrometer-most geotechs have them. Useful for finding soft spots or obstructions, like concrete loss below ground around buildings for example. If you do test holes-do at least three and special attention to anywhere where non standard design used (e.g. deepened footings) yep sounds good make the footing bigger to to allow for the pipe in the middle 3 5284 PM me your email. I have a build excavation calculator you can use based on your plans to double check what your builder is telling you. Cheers Simeon 1 8009 I've dug some footings to embed a post anchor into. My holes are around 450mm deep which I'll put a 200mm stirrup into. The bottom of these holes seem firm enough. … 0 1547 |