I've built a 2 story extension and installed a catnic lintel above the upstairs window.
I had to instal a standard duty lintel because the height of a heavy duty lintel would have clashed with the pre-formed roof trusses. I was assured that this would be adequate.
Above the lintel is 100mm high thermalite block and the wall plate sits directly onto the blocks. There is nothing on the outer skin of the catnic, as the soffit runs directly on to this.
I have now noticed a crack in the block work and the catnic under the block work has dipped slightly. I have put a straight edge across the trusses and 2 out of the 4 trusses (which are above the window opening) are out of line - making me think that the roof has dropped.
The roof has been complete for about 6 months, should I be concerned or not?
Would it be possible to jack up the 2 dropped trusses and remove the thermalite blocks above the window area and put in a 100 x 100 mm square steel beam on top of the catnic (on the inner skin)?
I had to instal a standard duty lintel because the height of a heavy duty lintel would have clashed with the pre-formed roof trusses. I was assured that this would be adequate.
Above the lintel is 100mm high thermalite block and the wall plate sits directly onto the blocks. There is nothing on the outer skin of the catnic, as the soffit runs directly on to this.
I have now noticed a crack in the block work and the catnic under the block work has dipped slightly. I have put a straight edge across the trusses and 2 out of the 4 trusses (which are above the window opening) are out of line - making me think that the roof has dropped.
The roof has been complete for about 6 months, should I be concerned or not?
Would it be possible to jack up the 2 dropped trusses and remove the thermalite blocks above the window area and put in a 100 x 100 mm square steel beam on top of the catnic (on the inner skin)?