Damp proofing / pointing advice

Discussion in 'Building' started by Guy Hall, 12 Oct 2020.

  1. Guy Hall

    Guy Hall

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    Hi all, I am new to this forum but based on the wealth of knowledge here hopefully I can get some advice.

    I have an old 1930's house and am redoing the entrance at the front door. Whilst doing this I a trying to sort out what I thought was condensation from the stone slab doorstep causing damp. There is condensation on the slab but not a lot and t is usually covered over with laminate floor board to act as a barrier between the cold slab and warm air. On closer inspection, the DPC goes down the side of the step and under it. I can push a stick from one side to the other over the DPC and you can see daylight through it. To me it looks like water is coming through over the DPC membrane and wetting the joists rising to the floor and plaster walls.

    It is also crumbling on the inside so don't know what the condition of it is like in between the bricks. I also don't want to remove the step.

    My thoughts were to use a DPC Cream injected in to fill the gap below the step but looking at the intended purpose and the cost per tube, it looks like its just for pre drilled holes not for filling whole gaps so now I am not sure whether to just re point (pushing mortar into the gap) and hope the membrane is ok, or try the cream?

    The beams are also wet on the brick so again, need to reinforce maybe but also replace the DPC under them?

    A lot of questions but want to get this right without being fleeced work work that may not need doing and need to decide soon as its holding up finishing the rest of the work.

    Any thoughts welcome
     

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  3. Mr Chibs

    Mr Chibs

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    Think I would slide in a new DPC under the door, then use expanding foam (or perhaps silicon sealant) to fill the gaps.
    No point doing it in mortar, when it gets wet on the outside, it will just wick it back through to inside.

    The new dpc under the joists and covering the sill, you should be able to slide it in behind the joist end.

    DPC is thicker/stronger, but will be in strips... you could double-up some 1200g DPM if you wanted to do it in larger sections.
     
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  4. Guy Hall

    Guy Hall

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    Thank you for the advice. I will look into what you have mentioned and see what I can do.
     
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