How should I fill this gap between wall and ceiling?

[EmilyD]

[JacobZ]

Hi @EmilyD,

Thank you for your question about filling a gap between your wall and ceiling.

The best way I see to close up this gap is to mount a piece of timber to the wall that is level with the timber running towards the camera at the top of your image and attach plasterboard to the underside of the two pieces of timber.

It's hard to tell from the photo where the level on the wall is in relation to this timber. I have shown two possible locations below that appear to be different materials.

The top line appears to be besser bricks, which you could use masonry anchors at 450mm spacings to mount 70 x 35mm Framing Pine.

The bottom line looks like it might be a steel beam, in which case you could use 50mm Tek Screws at 450mm spacings to mount your timber.

Once this timber is in place, use 30mm plasterboard screws to attach plasterboard to the underside of the two timbers, with the edge of the board flush with the outside of the timber as shown below.

You can then use External Angle Plaster Trims to create a nice clean edge before plastering and painting.

This is one idea that would work and look good but is certainly quite involved.

Allow me to tag @Dave-1, @Nailbag and @Jewelleryrescue to see what they think.

Let me know what you think and if you have further questions, please don't hesitate to ask.

Jacob

[Jewelleryrescue]

hi @EmilyD 

In @JacobZ  last photo with the dotted orange  line I would builders glue (liquide  nails)  cut  flat ply or any flat smooth ply like board Masonite onto that flat beam across to the wall. A timber  batton can be  pre glued  on outer wall so  a flat ply can  span onto it and support it. I would cut the ply to match the outer edge of the roof  beam? so it all looks more natural.

The repair is light  ply weight so glue will  hold  plenty strong  drilling into steel and  brick is  quite hard to do but a   strongest option for heavier timber.

Liquid nails if placed onto the ply and pushed up there  into   place will transfer some  glue to the  roof area.

Now  pull that ply back down. Counter intuative I hear you.

Wait  5 minite  for the glue to partialy skin on the board and on the roof  

Now push the  board back up there the glue  will grab fast like contact adhesive and shouldnt need support to hold  the board in  place.

Oh  there is a  fast  grab version of liquid nails but never  tried it.

Cover the remaining end hole  with ply the same way.

Use no more  gaps to seal any crack and  paint.

[EmilyD]

Thanks so much @Jewelleryrescueand @JacobZ - very helpful advice!

[Dave-1]

Good Morning @EmilyD 

I was thinking of a solution similar to @Jewelleryrescue but would use pine instead of another material. I would screw it to the timber strip on the underside of the ceiling and butt the edge of it up against the strip above the window. 

Dave