Cavity Tray at DPC level vs lean mix infill

[williamglossop]

I'm seeing more and more use of cavity trays all the way round a build at dpc level rather than two level DPC's (inner/outer leaf) with angled lean mix concrete.


Just wondering why things have changed more towards a massive tray all the way round.....

 

[^woody^]

Things have not changed

 

[williamglossop]

Thanks

 

[williamglossop]

Why would one method be used over the other...

 

[^woody^]

The only practical reasons would a difference in internal floor level, or a radon barrier

 

[noseall]

I'm seeing more and more use of cavity trays all the way round a build at dpc level rather than two level DPC's (inner/outer leaf) with angled lean mix concrete.


Just wondering why things have changed more towards a massive tray all the way round.....

The only practical reasons would a difference in internal floor level, or a radon barrier

The brand new home we are working on at present (Redrow Homes) has trays all round at DPC (B&B floors). I can't see any reason why the addition and it's deffo not a radon risk area. Builders must be steering away from sub DPC cavity filling perhaps in favour of DPC level trays..?

 

[^woody^]

Lose fill cavity insulation?

 

[stuart45]

With wheelchair access being required, ground levels need to be higher, (which requires a tray) is another reason.

 

[noseall]

Lose fill cavity insulation?

Probably. Why would it matter having sub-dpc lean mix cavity fill though?

Have you seen how the brickies keep the cavities clean these days Woods?

 

[^woody^]

Have you seen how the brickies keep the cavities clean these days Woods?

It's been a long long time since I've seen any proper brickies working

 

[noseall]

It's been a long long time since I've seen any proper brickies working

They lay hessian sacking in the bottom of the cavity, build the walls then smash out every third block and drag out the snot covered sacking.

 

[^woody^]

Bloody radicals

 

[23vc]

They lay hessian sacking in the bottom of the cavity, build the walls then smash out every third block and drag out the snot covered sacking.

Is there no insulation in the wall at that point then? That sounds a right b4ll ache

 

[noseall]

Is there no insulation in the wall at that point then?

I think the idea was contrived with partial fill in mind.

 

[noseall]

Bloody radicals

Indeed.

I showed my young oppo the blocks that had been replaced, when we recently did an outer skin knock-down.
A lot of effort but I do agree with it. I have seen snots stacked up to the third course above DPC, filling the (50mm) cavity.