stormwater drainage pipes

[mousiemouth]

I've been having a lot of problems with waternot clearing in the garden and discovered the soakaway I thought I had didn't exist the pipe from the guttering just went into the soil 4 feet away from the house. I have a man coming to extend the drainage out to to the burn (stream) at the bottom of the garden next week .... He's proposing to use a perforated pipe for the entire length from the guttering pipe onwards Can anyone tell me if this is ok as I have no idea and I seem to have a knack for employing cowboys!!! Help please from you knowledgeable people out there.

 

[^woody^]

I would use solid 100mm drainage pipe for the first 3-5m from the house, and then change to perforated pipe if you like. A single length of 3m plastic pipe may be more cost effective than extra cut lengths and connectors if price is an issue

The perforated pipe should be surrounded in pea-gravel (50mm minimum, 100mm recommended) and the trench lined in geo-fabric (like weed control stuff) to prevent soil leeching into the pipe over time

Ensure the pipe has a good fall to allow proper drainage without silting up.

If you have clay soils, then solid pipe all the way would be better

Thinking about it, the guy may just want to use perforated pipe because it is easier for him and cheaper (for him?) too. By the time you have include cost of gravel and fabric, it may just work out cheaper to use solid pipe.

 

[mousiemouth]

Thanks for that. woill contact him and tell him it's to be solid pipe...he's putting in two lengths about 45 feet each run..charging £1100. Is this reasonable for the pipes, gravel and fabric do you think?

 

[^woody^]

45 feet is about 14m, and a quick google shows 100mm pipe as about £40 for 25m and £130 for 100m

A couple of tonne of gravel will be about £80

Fabric, say £20

There may be a few other sundries, but the rest is then labour.

The depth of the pipe and access will have a bearing on labour costs, but on the face of it for a shallow trench it may be a bit high. Have you got comparable local quotes?

 

[mousiemouth]

had two other prices..one wanted £2,600...gulp! the other £1,900.