Bridging the cavity

[a1topdog]

My garage has a brick outer wall and breeze block inner wall.

In the past someone has a cut hole to the previously solid walls to fit an external door. The external door frame is only the width of the external brick work and is screwed directly into it , leaving the internal breeze blocks and cavity exposed.

The question is what is the correct way to finish doorway so that I cannot see into the cavity. Do I just screw a door lining kit into place?

 

[Richard C]

On internal walls, it's normal to use a plastic cavity closer & plaster over this; in your case the reveal should have been bricked up as part of the inner wall, using a strip of DPC between the outer wall & the inner block work. You could screw a door liner (or treated timber strip) to the inner block work to close the cavity but I would use some form of damp membrane between the wood & the outer brickwork to prevent ingress of damp.

 

[a1topdog]

Thank you.