Breathable Membrane DPC stuff

[GrantMcscott]

Hi 

My Joiner is putting on DPC stuff at the bottom of the timber frame and where the top of the first floor meets the floor  joists .  Is this necessary as I have never seen it done before?  See pic

 

 

[Mr Punter]

It is normally just under the soleplate.  Is that going to be a cavity tray at the bottom?

[GrantMcscott]

2 minutes ago, Mr Punter said:

It is normally just under the soleplate.  Is that going to be a cavity tray at the bottom?

 

it is under the solplate but also stappled on top of the osb the same way the wrap is thus you can see the black at both places where the wrap is not covering it

[dpmiller]

is the upper strip wrapped around the floor cassette as a TonyTray perhaps?

[GrantMcscott]

32 minutes ago, dpmiller said:

is the upper strip wrapped around the floor cassette as a TonyTray perhaps?

Both are stapled flat to the building the only thing I can see it doing is the same as the building wrap.

 

also does anyone know the chance of water Ingres and then getting through a hole in the wrap as my wrap has plenty of patch repairs. Water has to get through clad 100 mm block and then jump 50mm cavety 

 

 

Edited August 15, 2020 by GrantMcscott

[Gone West]

I had the DPC under the sole plate and then turned up around 200mm over the outside of the OSB racking and stapled. Then the Protect membrane went down to the sole plate covering the DPC. It was just belt and braces. I didn't have anything at first floor level.

[Drew1000]

There are normally 50mm firestops fitted around the perimeter at this level.  Every firestop should have DPC stapled to avoid transfer of moisture from the brick/blockwork that will form the outside walls.