Damp proofing course

zoominov

Hi all ,
Just needed some advice on damp proofing , I am building a extension and intend to use it for a kitchen and dining room , the builders have excavated the foundation and will put the concrete in tomorrow , what I want to know is what is recommended for a dpc 80 or 100 ?

I have a pipe which is leaking water and the builder is pouring concrete over that should he block the pipe and dry the water ?

iamcornholio

None of that makes any sense at all

zoominov

iamcornholio wrote: »

None of that makes any sense at all

What you confused about ?

teneighty

Sorry, I'm with Iamcornholio on this one.

You don't put a DPC in the foundation and I cannot figure out what the figures 80 and 100 refer too. Could you explain a bit more?

As for pouring concrete over a leaking pipe? That sounds like a recipe for problems further down the line. Why can't they fix the pipe first? Is it a drain pipe or maybe a water main pipe? Either way, leaking water near a foundation could well cause subsidence.

mikey72

minimum is 1000 gauge, (not 100), or 250 micron, but 1200 gauge is better, and dpm, not dpc. As for the pipe, it depends on what the water is. I dug foundations that hit a natural spring, the only solution was to pour concrete on it. If there is an issue, I's use a high performance 900 micron membrane, but the water would need to be assessed with the view to erosion and possible future subsidence.

iamcornholio

I would have thought that the plans would have the specification for any DPM or DPC?

As for the pipe, if its a drain pipe it should be fixed and bridged, not have concrete poured over it. And if its a mains water pipe it should be fixed and sleeved

And if its a drain, then it needs to be confirmed whether the water authority need to give permission or not

Are there any plans and is the council building inspector involved?

zoominov

iamcornholio wrote: »

I would have thought that the plans would have the specification for any DPM or DPC?

As for the pipe, if its a drain pipe it should be fixed and bridged, not have concrete poured over it. And if its a mains water pipe it should be fixed and sleeved

And if its a drain, then it needs to be confirmed whether the water authority need to give permission or not

Are there any plans and is the council building inspector involved?

Guys ,
Let me give you some background , basically we applied for planning that got accepted , applied for building control , payed the fee got a letter saying please re-submit and provide details of where you will move the drain etc and we did that got a letter saying "full plan rejection notice due to insufficient info " , phoned them up they said please re-submit we entered into a agreement with thames water and they said you can build over , then our builder rang them and said can we start work and they said yes , so we started the work gave a 48 hours notice , builder started work the council came to have a look at the foundation they said take a picture and bridge the gap so we did and carry with the work , they were meant to came today but instead rang my builder then who asked "can i speak to the owner" which is my dad they said "carry on with your work" as the inspector can't come , they told me this when i came home , is there something dodgy ? . do the building inspectors do this , the builder has done the dpc , and will put the doors and window is tomorrow , i will speak to building control tomorrow , what do you think guys , do you think there is something fishy ?