those big concrete block thingys

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11 years 2 months ago #34277 by feedqueen
any one know who to contact in Canterbury for those huge concrete blocks that interlock, you often see them at garden supply places or as walls for fert or palm kernal etc. Found one place through google but that was north island? they are about 1000 kg each.

Was wanting to know how cost compared to other forms of building large scale walls etc.
Any help much appreciated :D

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11 years 2 months ago #452346 by Hawkspur
Those are used to build retaining walls that work by being massive enough to resist the weight of earth, rather than having a structure that uses the earth in front of or below the wall to hold back the earth behind the wall). Gabions (wire mesh blocks filled with big stones) can also be used this way, and may be easier for your location. They can be filled on site which may be helpful.

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11 years 2 months ago #452355 by Aquila
Any retaining wall over 1.2 meters high needs a council permit. With timber there are economical ways around permits

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11 years 2 months ago #452367 by feedqueen
Thanks for your replies, have managed to find a contact to talk too.:)

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11 years 2 months ago #452369 by Hawkspur
Great. Hope it goes well. Here is some info on the exemptions for Building Consent:
If you are not in a rural zone, and your retaining wall is just carrying the load of an area of flat ground above it, (there are no vehicle traffic, buildings or steep ground immediately above it), then you can build a retaining wall up to 1.5 m high without requiring a Building Consent.

If you are in a rural zone, and a Chartered Professional Engineer designs the wall, and it is no closer to the boundary than it is high, (so is unlikely to affect the neighbour if it fails), then you can build a retaining wall up to 3 m high without needing a Building Consent.
If the area is likely to have low frequency of traffic (not right next to a house for example), then even though it is quite high, you do not need to fence the top to prevent falls.

The exemptions from Building Consent are given in Schedule 1 of the Building Act here .

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11 years 2 months ago #452393 by feedqueen
Thank you, am looking more to erect a covered silage type bunker than an actual retaining wall. sort of a non permanent shed really.

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11 years 2 months ago #452395 by Aquila
Must have changed. Pre quake was 1.2 meters. Because its not a retaining wall, if its not hard up against your boundary you can do what you want. As a suggestion a double layer of breeze blocks might do the same job. At a fraction if the cost. Failing that, simply precast it Johns road might have something similar

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11 years 2 months ago #452414 by little red digger
Contact Stahlton 03 3443014 they make them as waist blocks. Cheers

Dave and Ruth, Oxford Contracting

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11 years 2 months ago #452429 by Akzle
Replied by Akzle on topic those big concrete block thingys
if you don't talk to the council or government, and tell them to get off your property or you'll shoot them, you can build what you like.

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