Joining new wall to old (extension)

[adwt2004]

Hi guys,

Can anyone tell me about the DPC positioning for a setup like below

wall joining

• adwt2004
• 23 Jan 2018

I am planning to run two layers of dpc, one for each course and where the new wall meets old turn it up vertically around 6 inches.

Is that the best way to do it?

I've also read that you need to cut a slot between the two wall starters and vertically insert a dpc so it sits in the slot and new cavity too. Then make sure it sits against the insulation on the external side.

Are both of these steps right?

 

[^woody^]

Both right.

The vertical DPC would be in line with the back of the outer skin of bricks - ie 100mm in from the corner.

Horizontal DPC's should lap, but turning it up is normally done instead.

 

[adwt2004]

Thanks Woody, appreciated.