Backfill

[Craig ish]

How to back fill a preformed pond in a frame on patio flags

 

[Mmathis]

Do you mean like filling the base area with sand……?

 

[Craig ish]

Do you mean like filling the base area with sand……?

Back front sides and bottom its about 7 foot 4 inch long 4ft wide 2 foot deep not sure how much sand il need I was thinking quarter of ton of sand or am I better using to soil thanks in advance

 

[Craig ish]

Back and sides and front it's 7ft 4 long 4ft wide 2foot deep not sure how muc sand I was thinking quarter ton sand or topsoil

 

[addy1]

I would use sand, it settles better, how much? No clue, start with filling the bottom of the area so the pond rests flat, then add to the sides.

 

[Stephen Noble]

What are the sides of your framework constructed from? Can they withstand the pressure? The weight of the water plus sand could cause the sides to bulge out if there is not strong framework.

 

[addy1]

What are the sides of your framework constructed from? Can they withstand the pressure? The weight of the water plus sand could cause the sides to bulge out if there is not strong framework.

Good catch!

 

[combatwombat]

On top of what @Stephen Noble said, I would think you needed to backfill as you built the frame. Not sure how you can do it now without partially deconstructing.

Maybe pull the preformed pond and backfill until you have the liner resting flat on the sand like @addy1 said. Be sure to compact thoroughly so it doesn't settle. Then pop the top boards off that the edge of pond is resting on and backfill around sides. When you get to the top, slip the top boards back in under the lip of the pond and secure them.

 

[Craig ish]

What are the sides of your framework constructed from? Can they withstand the pressure? The weight of the water plus sand could cause the sides to bulge out if there is not strong framework.

1 inch thick decking boards

 

[Craig ish]

1 inch decking boards

 

[Craig ish]

On top of what @Stephen Noble said, I would think you needed to backfill as you built the frame. Not sure how you can do it now without partially deconstructing.

Maybe pull the preformed pond and backfill until you have the liner resting flat on the sand like @addy1 said. Be sure to compact thoroughly so it doesn't settle. Then pop the top boards off that the edge of pond is resting on and backfill around sides. When you get to the top, slip the top boards back in under the lip of the pond and secure them.

Thank u mate just how I was thinking

 

[brokensword]

What are the sides of your framework constructed from? Can they withstand the pressure? The weight of the water plus sand could cause the sides to bulge out if there is not strong framework.

though Stephen, shouldn't the preform expansion be almost nil? Sand is pretty forgiving and I doubt he can fill 100% nor should he, imo.

 

[Craig ish]

So what should I backfill with please

 

[addy1]

though Stephen, shouldn't the preform expansion be almost nil? Sand is pretty forgiving and I doubt he can fill 100% nor should he, imo.

That is what I thought, but mine cracked due to a void behind it. It was winter when it cracked not summer.

 

[addy1]

So what should I backfill with please

I would use sand