crowe

Thankyou George and Hugogo and Mark you all make a lot of sense. As you say it's not bowing the outer house wall and it's cracked down cement and through single bricks from the utility extension roof join where the lead is inserted into brickwork of main house. As you say the utility room extension will have differing thermal properties to the main house so this is likely to add to to it. I guess maybe need to look at some thermal joins.

Thanks very much, I must admit I had similar thoughts re extension ( utility single storey) but the ties and corrosion etc would make perfect sense as the water from the main build roof doesn't half flow down gutter and always overtops where it joins extension guttering so it wouldn't take much to get in the crack etc and with expansion etc in winter you make alot of sense. Will get a structural survey to confirm but thankyou.

Hi. After comments and thoughts please. I have a double storey extension built 15 years ago with a single storey adjoining utility room. The utility room was stepped back about 1.5 bricks from main extension. A crack has appeared, in the main extension straight up and down. started off as hairline now grown to about 0cm or more. Widest part is around the roofline join of extension. It does not continue to the ground. It has started to go upwards from here recently. Gutting comes down from the main roof on the same line.Does not extend inside through internal blocks. Anybody seen this before or have thoughts on causes??

Just joined and finding my way around the site. I am a Chartered Civil Engineer and Fellow of the ICE and CIHT. I have a couple of Structural questions to ask which although I have my own theories I'd like to ask people's opinions and also just gain insight into other problems that people are posing. Thanks