How to bridge this cavity

[pcaouolte]

Hi all,

I have an alcove which used to contain a window but since an extension was built, years ago, is now just an alcove in an internal wall.

I have lowered the bottom of the alcove by removing one course of bricks. There is a damp proof membrane in the cavity and, below that is cavity wall insulation. See photos:

I want to be able to tile this surface. What is the correct way to fill this cavity? I could shove 3 inches of mortar into it laying on top of the DPM, but is there a better/correct way?

Thank you for any help.

 

[Wayners]

You don't need that dpm. Think I'd remove.
Insulation won't do anything either.
Fix wood support to back wall for Hardie backer to sit on.
Hardie backer board over cavity stuck with polymer grab and couple of screws.
Plaster fill wall to match in

 

[noseall]

You don't need that dpm.

He does if that's an outside wall and he wishes to butt against it.

 

[noseall]

Hi all,

I have an alcove which used to contain a window but since an extension was built, years ago, is now just an alcove in an internal wall.

I have lowered the bottom of the alcove by removing one course of bricks. There is a damp proof membrane in the cavity and, below that is cavity wall insulation. See photos:
View attachment 302145 View attachment 302147

I want to be able to tile this surface. What is the correct way to fill this cavity? I could shove 3 inches of mortar into it laying on top of the DPM, but is there a better/correct way?

Thank you for any help.

Foam in a cavity closer then foam or dab a piece of plasterboard over the whole thing.

 

[pcaouolte]

Thank you both.

It is no longer an outside wall since the extension was built on the other side of it.

A cavity closer will be easier for me to get (and transport) than the Hardie backer board and I already have a piece of plasterboard.

 

[Wayners]

He does if that's an outside wall and he wishes to butt against it.

They mentioned having an extension so now it's an internal wall.
Guess we need to clarify

 

[pcaouolte]

They mentioned having an extension so now it's an internal wall.
Guess we need to clarify

Yes, it used to be an external wall, now it is an internal wall. I hope I don't need the DPC because I removed it today.

 

[noseall]

Yes, it used to be an external wall, now it is an internal wall. I hope I don't need the DPC because I removed it today.

(only kidding).