Correctly backfilling trench

[Mr Sparkle]

What are suitable/ recommended materials to backfill trench to cover main incoming electrical cable, mdpe and gas pipe?

I have some of the following materials spare

- Soil (but it gas tiny rocks in there)

- Sand (building/ plastering sand which has been mixed together)

When backfilling does one need to do any additional steps like compacting at certain stages?

 

[phatboy]

Much depends what is above the trench (Driveway, garden etc)

 

[Mr Sparkle]

Nothing but soil/grass at the moment.

But I will put some paving down later

 

[phatboy]

I'd get 100mm of pea gravel all around them, as a precaution. Ideally then add type1 base over that and whack down, then finish with topsoil.

But just topsoil over the pea gravel would be OK, it will compress over time of its own accord.

 

[veedee]

I'd get 100mm of pea gravel all around them, as a precaution. Ideally then add type1 base over that and whack down, then finish with topsoil.

But just topsoil over the pea gravel would be OK, it will compress over time of its own accord.

I don't get it..

Wouldnt pea gravel potentially damage the mpde/gas pipe and electrical cable?

What is the logic behind adding the pea gravel first?

I fitted some cable a little while back and I was advised to use sand to protect the cable

 

[phatboy]

I don't get it..

Wouldnt pea gravel potentially damage the mpde/gas pipe and electrical cable?

What is the logic behind adding the pea gravel first?

I fitted some cable a little while back and I was advised to use sand to protect the cable

It's recommended by the water suppliers at least, and essential for sewers. Cannot see how it would damage anything, especially if in utility ducts....

https://www.water.org.uk/wp-content/uploads/2018/11/wis-4-08-02.pdf

 

[noseall]

Warning tape is a good idea, laid on top of the protective sand layer.