cavity

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...

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.

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...

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...

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...

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...

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...

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...

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...

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.

Hi all, Just had our upstairs box room re-plastered - old vent taken off, so now an ugly hole into a void... it's a 1940s property - cavity wall - (filled with hay/straw?) and there is an air brick in there. The air brick appears to be blocked from the outside - can't see through it! - perhaps...

Hello, I have googled the hell out of this after I fell out with my architect for lying to me and can’t find the answer, so I thought I would join the fun and ask. I am not a builder but so far this has been an amazing learning curve. I am building an extension and we have planned to put 3.1m...

Hi Long time browser first time poster, Recently acquired a 1930's house with cavity walls. Previous owners had problems with damp and had DPM injected and cavity insulated. (early 90's) We have had most of the downstairs replastered during renovations and found some damp patches near the...

Hi I will be using periscope vents to air under a block and beam floor and wondered about the below ground cavity fill. All the regs say to fill the cavity to 225mm below DPC although this will partly encase the vents in said concrete; is that okay? Also when I am at DPC the building inspector...

Hi Please see pics included, the utilty area is single storey and the kitchen area will form the ground floor of the two storey extension. The inner blockwork forms the cavity wall between the utility and the kitchen and will carry on to form the inner and outer blockwork for the two storey...

Hi there, Newish home owner here. Since I moved in 9 months ago I'm hearing the occasional click/tick in the mid morning, a sound which appears to be manifesting itself in cracking plaster (As per photos). This is within a built in cupboard on an upstairs external wall in the middle of the...

Good evening everyone. Thanks for a great forum. Our home is a medium to large 1930's/40's semi-detached, made of bottom-half stone and top-half pebble. I'm not sure if this might be important info, but our home elevation is approx 675ft above sea level, although it is on a long flat road...

I moved into a terraced property that had cavity wall insulation added a year before. We've started noticing some mould on that side of the wall. My initial thought is to have the insulation removed but the external brickwork also has render. The render also has some slight cracks around where...

Property Type: 90's, Detached, Cavity wall Hi all, I'm looking advice on my leaking parapet walls. There was penetrating damp coming in to the bedroom on one side of the house (the same side as the pictures). After drilling a hole and taking a sample of the mineral wool insulation, it was...

Have a cold room, most likely because it's a corner bedroom of an end of terrace home with no cavity (circa 1900 build). I built some very nice wardrobes in the alcoves (which are on the outside wall) which will have to be moved because despite my best efforts, the clothes inside get very cold...