Hoping its jst settlement cracks

[DarrylAber]

good evening to all. Im new the forums and my first post is a problem i have with our year old extension. after the building work was finished and everything decorated i noticed cracks appearing above and below where the new windows were installed in both rooms.
Im afraid the pics have uploads on there sides. View media item 55782 View media item 55783
the other this was the screws that has been used looked like they were pushing back through from under the jointing compound.

i asked the builder and he said thats normal and to uncover the screwheads and tighten them back into the wall then re fill them lol. the pic you see with the radiator in it is the worst.i asked the builder about that and he told me to cut the fibreglass tape with a sharp knife and re fill that cracks. i done all this and refilled that cracks with eastfill jointing compound and it worked for a while. the cracks are cracks are back and im not sure what to do to stop it happening again.


my other issue is the roof in the new bathroom. View media item 55784 View media item 55785cracks appearing on what i think are joins again. im worried its going to fall in but im probably over reacting . any ideas on what the way forward is.
all advice and suggestions are greatly appreciated.

many thanks Darryl

 

[joe-90]

Crap picture but looks like shrinkage cracks to me. Not structural either way.

 

[DarrylAber]

Lol cheers Joe. My phone sucks. Il Mabey try and take better ones with our digital camera over the weekend. So is shrinkage solvable?

 

[joe-90]

When it's finished shrinking use a lightweight filler and forget them.

 

[dann09]

1. joe's right, wait, give the extension another year to dry out.

2. Sometimes during build the walls become saturated, timbers too, and after a heating season the materials will shrink and typically show cracks.

3. Was the extn. masonry keyed in to the existing house, or were "Furrfix" used?

 

[DarrylAber]

1. joe's right, wait, give the extension another year to dry out.

2. Sometimes during build the walls become saturated, timbers too, and after a heating season the materials will shrink and typically show cracks.

3. Was the extn. masonry keyed in to the existing house, or were "Furrfix" used?

many thanks for the reply. Guess I was to early in fixing the cracks the first time. Not sure what masonry keyed or furrfix means but it was a timber framed with breeze blocks then rendered. Il try and dig out some old pics and see if there's anything to answer that part. Lol

 

[dann09]

Darryl,
given a timber frame skin you would have been even more exposed to saturation during build.
Typically, the external breeze block skin would have little effect on the internal shrinkage.

Most probable that the block was attached to Furrfix, which is good for an extn.

 

[DarrylAber]

The building work was done march/April and I do remember it being crap weather. I was worried that it was sinking or somthing lol I had to plane two of the doors after about 6/8 months as the we sticking on the top of the frames so that had me worried. Many thanks. Il leave it to the summer then refill the cracks.