Advice -DPC and Cavity Tray.

[bilabonic]

Hi All

I'm building a non habitable outhouse amd confused as to where I out the tye DPC and cavity tray.

I have laid the raft.

I am 3 courses up with Eng bricks on outside and 1 block inside making both level.

By the time the outside patio is laid it will be 2 bricks (150mm) above it.

I have 4" roll of DPC plus a 600mm roll for the tray/vents.

Coukd someone explain please as I'm aware tye 4" DPC goes in now at 150mm on the outside.

Do I lay the tray as well on same course on outside but a block higher on the inside?

I can take pics later if needed or do a simple sketch.

It has 150mm cavity/100mm PIR going in as well.

Screed for inside is coming next week.

I've been doing with a mate who's a bricky/landscaper and I'm a spark.

Cheers.

 

[Deluks]

Yes basically, but your internal dpc must meet the damp proof membrane for the floor, which you haven't mentioned.
If your mates a bricky, he should know!

 

[bilabonic]

Never seen anyone put DPC on internal blocks?

There is a dpm.

So I'm laying 2 layers of DPC on the third external brick?
One wise ur hormonal DPC and the other will go form the cavity tray (it just looks like 600mm wide DPC).

Cheers

 

[bilabonic]

All sorted.
I misunderstood it.
100mm DPC is on inside.
600mm tray goes on next block course down to outside brick.
Radon barrier in as well.