Lowering patio level with French drain

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Surveyorman
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Re: Lowering patio level with French drain

Post by Surveyorman » Mon 28th Sep, 2020 4:56 pm

I can see where you have potentially identified a slate DPC but I am also pretty sure that where I have marked in red on the photo linked below is also a line of slates. Whichever runs continuously around the property is your original DPC. Just want to make sure that you correctly identify your DPC!

Image

Surveyorman
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Re: Lowering patio level with French drain

Post by Surveyorman » Tue 29th Sep, 2020 10:03 am

Not sure if you were able to view the photo I have marked up. Try this link:

https://imgur.com/FqMzqwj

RushupEdge
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Re: Lowering patio level with French drain

Post by RushupEdge » Tue 29th Sep, 2020 12:57 pm

Surveyorman wrote:
Tue 29th Sep, 2020 10:03 am
Not sure if you were able to view the photo I have marked up. Try this link:

https://imgur.com/FqMzqwj
Ah I was indeed able to see it, thanks for highlighting that! I've had a better look again in the day light, and I think that area is actually the wooden sill/lintel that has been partly cemented over (...because of course!)

Here's another image -
Image

and a shot of the top of the sill:
Image


In terms of the now exposed top course of the foundations, is it ok to just cover this back up with some of the sand that was previously covering this? As mentioned, I'm digging the rest of the trench as a 45 degree angle above this, but just a bit reluctant to put gravel directly onto this bit of foundation in case it causes any problems...

Surveyorman
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Re: Lowering patio level with French drain

Post by Surveyorman » Tue 29th Sep, 2020 1:47 pm

Yes - you are right in your original ID of the DPC - I can now clearly see that this is the timber sill.

I can't foresee there being any issues with backfilling the pea shingle gravel directly onto the footings to be honest.

Equally, if you prefer to have a layer of sand there this also wouldn't necessarily pose a problem. What you are really trying to achieve here is a relief the damp proof course. It is quite natural for the grounds around the footings to be moist (Especially during periods of rainfall) as this area is usually sub-soil and below your DPC.

There is an old post that I made on my Blog back in June that explains French drains in a more depth - pardon the pun :lol:

http://owsurveyors.co.uk/french-drains/

RushupEdge
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Re: Lowering patio level with French drain

Post by RushupEdge » Wed 7th Oct, 2020 6:17 pm

Just thought I’d post a little update - we’ve just about finished installing the French drain, just some concrete plinth left to remove.

Here are some pics - thanks for the help and feedback!

Image
Image

RBailey
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Location: Rutland

Re: Lowering patio level with French drain

Post by RBailey » Fri 9th Oct, 2020 9:52 am

Well done.

Surveyorman
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Re: Lowering patio level with French drain

Post by Surveyorman » Fri 9th Oct, 2020 4:31 pm

That looks terrific - first class job! Do you mind if I use that photo on a future blog post?

RushupEdge
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Re: Lowering patio level with French drain

Post by RushupEdge » Sat 10th Oct, 2020 10:25 pm

Surveyorman wrote:
Fri 9th Oct, 2020 4:31 pm
That looks terrific - first class job! Do you mind if I use that photo on a future blog post?
Sure, no problem at all

Thanks again for your help!

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