Ceiling Cracks after collars removed

Question

Hi. We recently got a small extension roof insulated with 100mm insulation boards and plasterboards on top. The guy doing the work said we could heighten the ceiling, by removing the collars that tied the two rafter sides together. He said that cause it was a small roof, that there’s not much weight and we don’t live in a climate that has much snow etc so that it would be fine. Job is less than 5 months old and the cracks have started appearing in the ceiling running along several lines. Just wondering were we fooled and if he knew what he was talking about or will our ceiling eventually collapse?

David · Accepted Answer

Most likely cosmetic; plaster board taped seems opening up - expansion/contraction due to heat/cold, etc.

Jo-anne · Answer

I would put straps back in from rafter to ceiling joists, if it's just settlement you can v out the crack and fill, but crack will more than likely re-appear. I would Skrim tape crack and re skim ceiling but I would put straps from rafters to ceiling joists tho first. This is just in my opinion without seeing it.

Bradley · Answer

Ceilings would've taken slight internal damage from disturbing the roof above to install the insulation, sometimes this can't be helped depending on the age of the property, sometimes it takes a while for cracks to start showing, I wouldn't worry about poor workmanship I just think that you may need internal skimming / dry lining after having the roofing work done.

Being a roofer I know that sometimes we cannot help disturbing plaster inside due to vibration and 'banging' it is just unlucky that its happened to you.

Leif · Answer

You shouldn't change the structure in any way unless you are experienced or qualified to do so

Ceiling Cracks after collars removed

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