How to fill gaps - ceiling and wall

[Mutley56]

Dear all,

Advice would be gratefully received

I need to redecorate a room in my 1930’s house

Room had a new ceiling 18 years ag. There is now with a gap at the top between ceiling and bay window - see picture

Extension 8 years ago requiring an original wall cupboard removed and what was the opening plaster boarded over. Gap at top between wall, ceiling and picture rail - see picture

How do I fill there gaps before redecorating? Decorators caulk, light weight filler?

Thanks in advance

 

[Wayners]

If that's a plasterboard ceiling as new 18 years ago?
Rake out a bit deeper.
Seal in joint with Gardz.
I then use CT1 or Stixall and get it deep in the joint as this sticks the wall to the ceiling.
Make sure it deep leaving enough room for filler to cover the polymer mastic.
Now fill the wall only tight to ceiling with toupret powder filler.
When dry fill the ceiling tight to wall.
When dry use a sanding block around edge making the wall and ceiling smooth.
Get the corner best you can.

Other way which is not so good but easier is just to seal in joint with PVA.
Push some filler in and square off. Sand and paint.

 

[opps]

Image 1- lightly sand the edges of the crack and fill with caulk. The caulk will shrink back slightly so you may want to apply a second caulk.

Image 2 - hack away the blown plaster. You could do a first fill with Toupret Flex and Fill if you are worried about it cracking again. Otherwise just fill with a light weight filler such as Red Devil OneTime. It is a dream to sand and the dust doesn't cling to everything. It will tolerate very, very small amounts of movement

Image 3 - a combination of the above. Caulk. Once the caulk has cured use OneTime filler. Personally I would apply a coat of SBR first to reduce the risk of the paint activating the wall paper paste where the paper has been ripped back. You could however hit it with a coat of emulsion- Onetime has a very low water content. Normal filler which you mix with water would probably activate the wall paper paste and blow it.

edit- i was composing my text and hadn't that @Wayners had replied. An advantage of the CT1 one that he recommended is that it will not shrink back (unlike caulk).

 

[Mutley56]

Thanks both for the advice.
Yes, new ceiling 18 years ago and not lathe and plaster.
Will start next weekend, hopefully a bit cooker to work then.

Mutley56

 

[opps]

Best of luck.