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Can anyone please advise on domesti

Can anyone please advise on domesti

Can anyone please advise on domesti

(OP)
Can anyone please advise on domestic calculations. I am looking at dormer calculations and want to know if it is acceptable to support a ridge beam on the existing chimney breast (via a padstone) similar to the image below
.

My understanding is that this not allowed due to potential deformation of the steel due to heat within the Chimney. However, are there also structural implications?

I have also seen designs where a bracket is fixed to the Chimney Breast and where the ridge beam is supported by a steel post .

Many Thanks in advance.

RE: Can anyone please advise on domesti

are you in a seismic area?

how thick are those brick walls, how tall, and how old?

RE: Can anyone please advise on domesti

(OP)
No seismic. Walls are likely 1 brick thick, 102mm and say 90 years old.

RE: Can anyone please advise on domesti

are you an engineer? sounds dodgy

RE: Can anyone please advise on domesti

DTC87_2:
It is usually kinda tricky placing new large concentrated loads on old masonry chimney structures. It takes some serious engineering experience and judgement to make this work well, if at all. Usually, chimney structures are intended to support and confine fireplaces and their chimneys, and any leaked sparks and the other products of combustion. They are not (or have not been) designed to take other structural loadings. They are very heavy on their own footprint and might settle differently than the rest of a lighter framing system. Thus, they are usually built independently of the rest of the structure, except that they may laterally support each other and be conjoined at the foundation. Furthermore, there are fire rating issues with supporting structural members on and into the chimney structure. It is really not a matter of the chimney heat weakening or deforming any structural members. Those magnitudes of temps would indicate a real serious chimney defect. Building codes are usually quite specific about clearances btwn. chimney structures and the remaining bldg. framing and any allowable support of structural framing on the chimney. The fact that you see some instances of structural bearing on chimney structures does not make it code compliant. It just means that they got away with it and that the structure has probably never seen the code max. loads either vert. or lateral. Lots of things seem to work under normal conditions and circumstances, which do not take full account of public safety which is required by the bldg. codes, which we must design to meet.

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