New house land/slab drainage?

Froth · Sep 10, 2023 8:33 am

Good morning everyone,

Have a new house build about to finish soon and I was wondering if the builders already put drainage around the slab or foundation. Or is that something that a landscaper is supposed to do after the house is built?
Looks like they graded the soil away from the slab a bit, but my concern is slab heave and also sitting water.

The gardens are just going to be diy landscaping river stones with some pavers. I was planning on putting weedmat down and then putting the river stone , filling any uneven gound, then using a bit of rapidset under the pavers on the stone.

Any help guys and I'd be very appreciated 🙏

Cheers,

Frothy.

Saint Mike · Sep 10, 2023 3:35 pm

I would doubt they have done anything

Froth · Sep 10, 2023 6:22 pm

Yeah haha that's the scary part. It's simmonds homes so they should have been a bit more onto it though.

Froth · Sep 10, 2023 6:23 pm

Saint Mike

I would doubt they have done anything

Yeah lol

building-expert · Sep 10, 2023 8:10 pm

Why dont you have a look at your drawings, it should show drainage on site plan.

Froth · Sep 11, 2023 11:03 am

building-expert

Why dont you have a look at your drawings, it should show drainage on site plan.

Yeah I tried, it's got the downpipes but honestly it is a struggle for me to interpret the drawings. Is it common for the builder to install site drainage as they are responsible for the build? Cheers

building-expert · Sep 11, 2023 11:54 am

If the drainage is on the plan then the builder has to follow the plan

Froth · Sep 11, 2023 12:28 pm

building-expert

If the drainage is on the plan then the builder has to follow the plan

Okay thanks for that. I'll ask the building supervisor if they installed foundation drainage/aggie around the perimeter of the slab.

Cheers mate 👍

alexp79 · Sep 11, 2023 12:37 pm

They usually never put it on the plans per se, however, in the notes the plans usually say that builder has to provide drainage to the site if necessary. What type of soil you are on?

Froth · Sep 11, 2023 12:43 pm

alexp79

They usually never put it on the plans per se, however, in the notes the plans usually say that builder has to provide drainage to the site if necessary. What type of soil you are on?

Thanks for the reply.

The soil is sandy, located in cranbourne, vic. I think it mentions grading of soil around the house , the builders only partially did that. The back corner has pooling water.
My main concern is slab heave. The geofabric under the rock garden should be okay with drainage hopefully.

SaveH2O · Sep 11, 2023 2:42 pm

The powers that be changed the drainage provisions when it transitioned the NCC Part 2 2019 to the 2022 edition.

If you send me an email address, I will send you both the 2019 and 2022 versions of the NCC Part 2.

As far as the pooling goes, take dated photos.

Froth · Sep 11, 2023 6:13 pm

SaveH2O

The powers that be changed the drainage provisions when it transitioned the NCC Part 2 2019 to the 2022 edition.

If you send me an email address, I will send you both the 2019 and 2022 versions of the NCC Part 2.

As far as the pooling goes, take dated photos.

All good, got the new NCC 👌 thanks for the offer though. Got the building inspections reports with photos through the stages of the build so should be fine. Also mentioned in the report.

Thanks for your input

groundzero · Sep 13, 2023 7:03 pm

Froth

alexp79

They usually never put it on the plans per se, however, in the notes the plans usually say that builder has to provide drainage to the site if necessary. What type of soil you are on?

Thanks for the reply.

The soil is sandy, located in cranbourne, vic. I think it mentions grading of soil around the house , the builders only partially did that. The back corner has pooling water.
My main concern is slab heave. The geofabric under the rock garden should be okay with drainage hopefully.

Cranbourne has highly reactive soils as well and a history of cracked houses so I would be careful depending where you are in Cranbourne.

Froth · Sep 14, 2023 1:16 pm

groundzero

Froth

alexp79

They usually never put it on the plans per se, however, in the notes the plans usually say that builder has to provide drainage to the site if necessary. What type of soil you are on?

Thanks for the reply.

The soil is sandy, located in cranbourne, vic. I think it mentions grading of soil around the house , the builders only partially did that. The back corner has pooling water.
My main concern is slab heave. The geofabric under the rock garden should be okay with drainage hopefully.

Cranbourne has highly reactive soils as well and a history of cracked houses so I would be careful depending where you are in Cranbourne.

Thanks for the heads up mate, greatly appreciated 👍