cavity

  1. B

    Cavity at door threshold

    I know this has been posted many times before and I have spent time looking at those threads. I'd just like confirmation from those more knowledgeable that what I'm about to do is correct. The builder has left me a shell of a garage and what will be a utility room on the back. The floor levels...
  2. H

    Closing a cavity below door

    hi there, I am looking for some advice regarding my home project. We have had the wall below a window removed to make way for a back door which is being fitted at the end of the month. As you can see from the photos there is an existing dpc on the external leaf. The internal wall was brick...
  3. H

    Closing a cavity

    hi there, I am looking for some advice regarding my home project. We have had the wall below a window removed to make way for a back door which is being fitted at the end of the month. As you can see from the photos there is an existing dpc on the external leaf. The internal wall was brick...
  4. L

    Closing window cavity

    Hello everyone, I was hoping to get some advice on how to proceed with finishing off our windows. We had windows changed and moved forward so they sit flush with the outside wall. We’re left with cavity on the inside, which mostly have battens in the cavity gap (left, right and top side)...
  5. L

    Where's the water coming from??

    Hi , The boxed in support beam in my kitchen had water coming in. The hole in pic was made to see where exactly the water was coming from (photo attached). I've been told three different things - that it's because there is probably no tray in the cavity wall, that it's the render, that it's the...
  6. Allex

    Cavity wall and airflow.

    I have a block built property. It has unfilled cavities. There are vents through the inner wall to outside wall air bricks under the floorboards which work well keeping it all dry. The walls are built on a concrete platform with 500mm between floor joists and concrete. I am considering filling...
  7. 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...
  8. M

    Window Sill Tiles Removed in Bay Window - Open Cavity

    We removed the tiles from our window sill and ended up exposing the open cavity. (1959 Bungalow) What would be the correct method to close the cavity and replace the tiles with a wooden window sill? I dont think a cavity closer goes smaller enough to fit in to the void. I was going to: 1...
  9. D

    Timber frame draughts and general construction queries

    Hi, I'm trying to locate draughts (drafts?) in my timber frame house and I don't expect to find everything, just any faults or things that could be fixed in DIY jobs where possible. I know this is a never ending task for some houses so I'm just looking for big wins (autocorrect says big wind!)...
  10. M

    How to Close a New Build Cavity - Bi-Fold Doors

    Hi all, I hope you are well. I am looking for some advice on our extension and how to close our cavity floor to install a bi-fold door. Currently we have a 2.05m high by 2.0m wide area for the bi-folds. On the external wall is a layer of stone directly on the blocks which has a DPC and is...
  11. S

    Exposed joists under front door

    Hi, I'm currently doing some work on the front garden to take the ground level below Dpc level and have removed paving slabs from the whole area. However after removing the ones in front of the front door, it's exposed the sub floor beneath the hallway. There's no outer brick skin present just...
  12. SS-ProjectBuild

    XPS insulation below DPC in trench...

    Hi Guys, Any issues with placing 50mm xps insulation slabs externally in the trench below dpc/ground level before backfill? To help with insulating the building? Please see pics.
  13. SS-ProjectBuild

    Concrete cavity fill (225mm below dpc) question?

    Hi Guys, I will be filling my cavity as per title over the weekend prior to backfilling and compacting the ground. I know i need to use 8 part balast to 1 part cement gfor the mix...but i have read conflicting messages about the consistency of the mix....should it be wet or dry? Also i have...
  14. L

    Cracked leaning internal walls into cavity?

    Can anyone help me with this problem? I have 2 bedrooms that have a large vertical crack at the point where their joining wall meets the inner leaf exterior wall (circled in red). The walls are not plumb and it appears that the inner leaf wall is leaning into the cavity and pulling away from...
  15. U

    Garden retaining wall, concrete block k-rend and cavity?

    Hi folks, I’ve done quite a bit of research but can’t find the exact answer to the exact question I have; do I need a cavity in a 2 skin concrete block wall to satisfy k-rend requirements? Background. I have had a 1.5m block retaining wall built and hope to k rend it (eventually after other...
  16. T

    Insulate existing gable wall? BCO

    Hi guys/gals I’ve just had a plans appraisal back from our independent buildings inspector regarding a rear extension and loft conversion. He’s asked my architect to explain how the existing gable end wall will be insulated to ensure a u-value of 0.28W/m2k. Obviously the most practical way of...
  17. S

    fish cable through solid wall

    can someone please offer some advice... i'm trying to run an alarm cable from the loft down to the ground floor. I've found there is an EMPTY cavity inside our house which i can drop the cable down but my question is how do i locate the cable and then pull it through on the ground floor. the...
  18. T

    Cavity tray required below a bifold door?

    Is a cavity required below a bifold door? My architect has sent me drawings and it’s showing a cavity tray with weep holes below the bifold, I’m presuming it may be there to send any water that goes through the frame/sill to the outside (he’s currently away) here’s the part of the drawing...
  19. T

    Fitting restraint strapping ceiling joists?

    Hi guys/gals, I’ve recently had my building regs drawings through from my architect for a loft conversion where the truss roof is coming down and new roof put up, it states “restraint strapping - ceiling joists and rafters to be strapped to walls and gable walls, straps built into cavity across...
  20. MikeStout

    Cavity fill: rockwool or EPS?

    Which one is better for a new built: rockwool or EPS? Rockwool doesn't look sturdy enough. Will it fall down with time? EPS, on the other hand, needs to be fixed firmly to the inner skin. Will it stay like that? Yes, the question may seem silly, sorry.
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