Waterproofing brick silt trap

[mayfel]

Hi!

I have a silt trap in the driveway which takes driveway rainwater run-off and rainwater from the garage roof. It is a brick man hole with red engineering brick and concrete base. However, it seems to lose water quite quickly so instead of flowing out of the outlet pipe it is dissipating into the ground around it. What would be best for waterproofing it. Have tried thompson's damp seal but doesn't appear to be working still.

Cheers.

 

[noseall]

I'm not sure i understand what you are saying/asking.

Is this rainwater collection chamber meant to fill with water and then empty slowly?

How do you know it is not emptying via the outlet?


Ahhh i get it! The outlet pipe is at high level so the chamber is allowed to fill before exiting the chamber, thus trapping the silt. Silly me.

Dig it out and build a new one.

 

[Nige F]

render it waterproof - with waterproof render ( I only said that for noseall He`s still laughing @ the wicking)

 

[noseall]

render it waterproof - with waterproof render ( I only said that for noseall He`s still laughing @ the wicking)

 

[mayfel]

I'm not sure i understand what you are saying/asking.

Is this rainwater collection chamber meant to fill with water and then empty slowly?

How do you know it is not emptying via the outlet?


Ahhh i get it! The outlet pipe is at high level so the chamber is allowed to fill before exiting the chamber, thus trapping the silt. Silly me.

Dig it out and build a new one.

Er... what?

 

[noseall]

What part of "dig it out and build a new one" did you not get?

You could try Niges solution, as in tanking it with waterproof render but this method will only last as long as the brickwork does not move and crack the render.

 

[mayfel]

Just thought it might be a joke... sems a bit drastic to dig up part of driveway. Have since found a £10 EPDM pond liner at local garden centre and lined the man hole so it's fully tanked with no seams. Cheers.

 

[johno1982]

Is this the type of Silt Traps that you are referring to