dpm

  1. M

    Most effective insulation under carpet – above suspended vented wooden floor

    My living room is on ground floor. It has a suspended wooden floor over a large vented cavity (several feet deep). It gets pretty cold in winter. I want to get carpet in this room; both for comfort and to increase the warmth/insulation in the colder months. I’m aware that doing under-floor...
  2. T

    Damp

    Any advice on the below? We are renovating our house and found a very damp inside corner of an external wall, where the original wall of the house was knocked through to a single storey extension. You can see in the photo the wider footing of the house. Our builder thinks this is because the...
  3. J

    House to conservatory DPC with doors removed

    Hi, confident DIYer but never done something like this before... we've recently had our conservatory upgraded with a solid lightweight roof and new frame and glazing and built up the existing dwarf wall to full height (block and Brock with cavity) adjacent to the neighbours (previously just...
  4. HHHamster

    Summer House Floor Level Below Ground Level?

    Hi All, I'm planning to build a summer house at the end of my garden up to the boundary, with rough dimensions of 7.5m x 3.5m, flat warm roof. Plan to use the space all year round as an office though will also house gym equipment and therefore am looking to maximise the head height for over...
  5. O

    Finish DPM on concrete base for wooden workshop

    Any help on this would be most appreciated; I have spent the past couple of weeks scouring the internet for a definitive answer on how to best finish the DPM on a concrete slab/plinth prior to the workshop being constructed this coming Monday. Base is exact size to match the wooden workshop as...
  6. J

    Kitchen Floor Mess

    I am somewhat out of my depth with a house renovation and would massively appreciate some advice regarding the kitchen floor... There has been subsidence at some point in the house and the concrete kitchen floor was uneven to the tune of around 50mm from high end to low end. I ripped off the...
  7. M

    Plastering before screed/ Plastering over of DPM membrane

    Hi. We are building an extension and laying new floors inside the existing house as well. We are managing the job ourselves, but seems like we are making lots of mistakes, relying on "specialists" trades instead of doing our own research to get the right solutions. I know we got it wrong, so...
  8. L

    Can Steel concrete casing form part of floor slab?

    Hi, More for my understanding and planning right now, but my wraparound extention is set to have a box frame steel beam running below the floor (where the wall will come down), right down the middle of the room which will be encased in 100mm concrete. My question is, can the top of that...
  9. C

    HELP!? Keeping A 1970's Single Garage Dry?

    Hi All! First time post but have been a long time reader of the forum. I bought my first property in 2020 which is a 1970's maisonette which includes a single garage which is one of the middle garages in a row of 4. Last winter and whenever there is heavy rainfall the garage becomes damp as...
  10. T

    Screeding over cavity

    I am currently renovating my kitchen and am looking for some advice in how to screed over a cavity. A section of the old screed layer has broken up around the edge of the patio door threshold. At the moment, there is a dpm under the patio door overlapping the cavity and meeting the main dpc...
  11. A

    DPM needed ?

    I have a timber frame structure mounted on concrete blocks around the perimeter, which are bedded on a concrete base.The concrete base has a membrane but is cut off flush. as i'm doing a solid floor inc Ufh made up of 150mm celotex , a seperation layer then UFH stapled on top , before a 75mm...
  12. T

    Waterproofing

    It seems that previous attempts to waterproof the first few courses of brickwork on our outside walls was done with Blackjack paint. Reading up on the stuff it doesn't say for use in masonry. It's neees another coat so I was thinking of just using the same again, I'm not sure how breathable it...
  13. M

    Converting Victorian cow shed / garage

    I am trying to convert my Victorian out building into a summer house / gym. The floor is brick and very damp but also has a slope of about 7cm across 3.5m it is also very uneven. I have already put a DPC into the walls and now I need to damp proof and level the floor. Should I: 1) flatten the...
  14. R

    DPC thickness

    The building regs say a DPM should be 1200 gauge - but what about DPC? The DPC's you buy in Toolstation and the like seem to be thicker than 1200 gauge, but what is the actual requirement? Could you use a sheet of DPM cut into strips as a DPC? - for example, as a cavity tray above a lintel...
  15. C

    Constructional Hearth Guidance

    Hello everyone, I have spent the last few days reading lots of posts on constructional hearths for solid fuel stoves but very little reference to gas fires. The background: I have bought an 1890's victorian semi which was unoccupied for 16 months and previously rented out. The property...
  16. R

    Retrospective installation of stepped and raised dpm for flush patio

    Hi there, hoping someone can assist with this particular headache! We had an extension built (now 2 years ago) and are currently in process of adding a patio. The key design feature of the extension was to have a flush through floor in and out of the large patio sliding doors. Now we are half...
  17. T

    DPM for 1ft engineering brick retaining wall?

    Hi guys, I’m building a single skin, 4 courses solid engineering brick retaining wall to retain a small garden lawn. I’ve left weep holes every 2nd brick at ground level and will backfill with 10mm pea gravel, but wanted thoughts on whether a polythene membrane should be put along the side of...
  18. S

    Vertical damp

    Hello. Our Victorian terrace house is built with the garden wall continuing as the party wall for the property. Water is sucked into the interior of the house as it was built without any vertical break or damp proof course, it’s just one long wall. I removed the concrete render from the interior...
  19. M

    Inner leaf damp proof too high?

    Hi all, hope you are well. We currently have an extension underway and it appears the dpm will be a good bit higher than the finished floor level (almost a block higher). I assume they have got this wrong due to sloping ground and having to add a cavity tray. The builder is no longer with us...
  20. D

    Summer house on concrete base... advice pls

    Hi all, having searched and searched for a clear answer I’m hoping some one can help. I’m going to try and build a 3m x 3m garden room over lockdown. There is already a concrete base down which I am going to put it on which was laid in 1950s I think, very flat and level. I planning 2” x 3”...
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