Water Pipe - Advice Needed

Sami23

Have a short trench dug to bring 3/4" hydrodare supplying water into the house.
What I want to know is what would be the best thing to backfill the trench with to prevent pipe from freezing during frost or would it make any difference:
1. Clay
2. Sand
3. '804'

Also, would it be worth putting some lagging on the pipe before covering or is there something better than the ordinary lagging I could use.
Thanks

reilig

Bury the pipe over 750mm deep and clay will do just fine to prevent it from freezing,

Bizzum

reilig wrote: »

Bury the pipe over 750mm deep and clay will do just fine to prevent it from freezing,

And pay attention to where it enters/leaves the ground. If its gonna freeze this is where its vulnerable.

joejobrien

Exiting the ground is the proplem will occur, running the pipe 750 mm plus is unlikely to be an issue for the underground pipe and dont place sharp stone around it also.

dzer2

Bizzum wrote: »

And pay attention to where it enters/leaves the ground. If its gonna freeze this is where its vulnerable.

If its in to a house it should enter under the ground as well so the exit shouldn't be a problem.

poor farmer

Clay is the best insulator .
Having the pipe 600mm +below ground level is the best insurance.
A layer of sand or fine 804/dust around the pipe, is useful if you think you might have to dig close to the pipe in the future.

MfMan

Take a few pictures of the trench before you close it in, in case you ever have to dig it again and are wondering where the pipe is laid.

Bizzum

dzer2 wrote: »

If its in to a house it should enter under the ground as well so the exit shouldn't be a problem.

Agreed. I brought my own up under the kitchen sink. But its where its coming from too, for example it could be an existing house.
A gate valve is a good idea where it comes in too. Handy to be able to rapidly turn off the supply.

Froststop

Sami23 wrote: »

Have a short trench dug to bring 3/4" hydrodare supplying water into the house.
What I want to know is what would be the best thing to backfill the trench with to prevent pipe from freezing during frost or would it make any difference:
1. Clay
2. Sand
3. '804'

Also, would it be worth putting some lagging on the pipe before covering or is there something better than the ordinary lagging I could use.
Thanks

Keep the pipe at least 750mm deep as another poster has suggested and you won't have a problem on your main run. Usually where the pipe enters the building is the problem as it's not as deep. It may require a deep hole inside the building to get the pipe through the outer wall and have it deep enough outside to prevent freezing. However if you can't get it deep enough entering the building it can be sorted at a later date.

If you lag the pipe you will need to water proof it. If the lagging soaks water it will loose it's insulation value and result in freezing sooner.

49801

Reason folks use sand is to protect pipe when backfilling.
Bit of manual work with a shovel to cover pipe and keep stones away works just as well:)

Do consider putting in a duct with rope while your at it! You will use it some day:cool:

GY A1

+1 clay