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Condensation on cold water Pipes

Discussion in 'Plumbing and Central Heating' started by Trinity89, 22 Feb 2021.

  1. Trinity89

    Trinity89

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    Hi, wanted some advice on some condensation on our cold water pipes. Please bear with me on this.
    Just after xmas we noticed a mouse had been coming in through a small hole next to where the gas main comes in the house and through the cavity wall. I filled the outside wall with mortar and the gap in the internal wall was lot bigger so used some expanding foam. ps(caught the mouse)

    That corner of the kitchen is alot warmer now which is great but last week we could here a tapping from the boiler in that corner. It might be dripping but to me i wouldn't here dripping as it is all boxed in. Ive taken all of the boxing away from the boiler and couldn't find any signs of a drip so not sure why this noise has started occurring.

    Directly below, under the worktop where the gas main and cold water comes in i noticed all the cold water pipes have condensation on them and this has been dripping onto the concrete floor, this must be a direct result of me blocking the gap up in the brick as there wasn't any moisture there when i was in there setting mouse traps.

    Ive put some lagging on the pipes i could see and get to and think i will put some trays or tubs down to catch the water so its not soaking into the floor.

    My dad suggested drilling through the expanding foam and creating that air circulation again im not keen on this and making the kitchen cooler again. My wife seems to think it happens this time of year when the water is colder in the winter and the condensation evaporates every year, im not buying this.

    Is there anything else i can try if anyone could give me their opinion it would be welcomed.

    PS the only other thing that has changed is that ive puchased a dehumidifier but this is on the first floor and is on for three house on a morning.

    Many thanks.
    Ian
     
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  3. KenGMac

    KenGMac

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    Trinity89, good evening.

    What type of Insulation did you fit?

    Ken.
     
  4. Trinity89

    Trinity89

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    Hi, i used Soudal gap filling foam. I took some of it out last night to see if i could get some air flowing from the cavity. Will leave it for a couple of days and see if its made any difference.

    thanks
     
  5. Madrab

    Madrab

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    If you need air flow then install a trickle vent, either that or dig out the expanding phone and get some large holed chicken wire and bundle it up. They can't chew through the chicken wire as the gaps in the wire don't give them anything to bite onto.
     
  6. Trinity89

    Trinity89

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    Hi Madrab, we actually have some replacement windows booked in with trickle vents in so hopefully that will help and id never though of the chicken wire, will give that a go once i take some more of the foam out.
     
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  8. Madrab

    Madrab

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    I really meant a trickle vent, on the wall in the area where the condensation is occurring. The kitchen is a naturally humid area and condensation is a common problem, the insulation should sort it though as the moist air can't get to the cold pipe any more.

    It's really only an issue in the winter when the water is much colder.
     
  9. Trinity89

    Trinity89

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    Im abit lost now, ive only noticed the condensation after i blocked up the hole in the cavity wall with expanding foam. The warm air in the kitchen must be creating the condensation on the pipes. Ive taken some of the foam out last night to create some ventilation to cool that area down again.

    thanks
     
  10. Madrab

    Madrab

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    Yes, the humid air in the kitchen is condensing on the cold water pipe. The little ventilation that there was, was obviously stopping or drying the humid air before it managed to get to the pipe.

    So there are 2 choices - either stop the air getting to the pipe using insulation or ventilate the space again.
     
  11. Trinity89

    Trinity89

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    Apologies, that makes perfect sense, might be another night in the cupboard cutting the foam away tonight.
     
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