Cracks on celing skimmed 2 years ago (ish)

[shabbaranks]

Hi guys
I know cracks can happen in relatively new buildings/extensions etc but I was wondering if you can help me with the best way to tidy them please? I've gone through one with a stanley knife and then filled it but it's come back. Attached are some pictures of the type of cracks I'm dealing with. It's on an extension with a flat roof if that makes any difference? Thanks as always

 

[Wayners]

Cracks over joist? Probably not.
Tungsten scraper to make a channel.
Fibre fuse mesh tape set in that channel with toupret filler.
Sand
Paint.

If you sink the tape below the original surface you don't get a surface bump. Can't see the tape.

 

[shabbaranks]

Thank you will give it a go and see what happens

 

[Koolpc]

Another good way is to rake out the cracks, make small holes along the crack and squirt in low expanding foam.

Then, cut back and fill when cured. Works a treat.

 

[Wayners]

I've written here many times about how I repair cracks like that.
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