cavity tray

~Vaulted kitchen asymmetric roof single storey extension ~Block work with cavity supporting Catnic type RSJ ~Bespoke glazing (2 x triangular) on RSJ ~Sliding doors under RSJ ~Ali cladding C section over external of RSJ My concern pre door/glazing install is the detail on the RSJ with the...

We've had issues with our garage ceiling since we moved into our new build Almost 4 years later now....I know....it's still leaking after being repaired numerous times, they are still repairing it...must be in the 15/16th attempt. I know it's hard to tell without seeing it, but here is some...

Wondering if anyone can help, looking after some guidance please. I’m doing a loft conversion and currently reinstating the party wall edges. I had an issue with leaks prior to this and I believe it was due to having old concrete tiles on angle, without any lead flashing. I’ve attached a...

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...

The house I bought at the end of last year has had an extension built around 2-3years ago, however it seems when they built it they failed to fit a cavity tray. We're getting damp patches forming right underneath the lintel and on the edges of the wall that support the lintel. We've been told...

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...

So I’m doing a loft conversion and extension on my 2 bed bungalow, the building regs notes asks for “fire resistant cavity barriers to be installed at tops of wall and gable end walls” anyone know what these look like? And can provide me with a link to the ones I need? It’s a full fill cavity...

I am trying to ascertain where cavity trays are required. As I understand it they would be needed any time the wall cavity gets penetrated eg. above a window or an external door. However building control have said that I also need a cavity tray where my extension roof meets the existing wall. Is...

Our house walls have a cavity formed by two leafs of lightweight block with an external facing of rough cut stone. A new extension with a flat roof is to be built out from such a wall. This requires a cavity tray to be inserted along the roof line but all the ready-made trays I see are designed...

Hi I have a 600mm gas DPC bridging the cavity and I need to install a cavity tray with this. I started to use some polythene DPC as the cavity tray and mortared 20-30mm of this DPC cavity tray on top of the gas DPC of the external leaf. I'm worried in case any water seeps under the cavity...

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...

I have a flat roof that abuts a vertical wall. I installed 'refurbishment' type cavity trays which are the type with no lead attached, just a clip that keeps the spacing while the motar goes off. The clips are then removed and the lead flashing goes in under the lip of the tray. So my...