Mechanical fixing mortared ridges

[TonyW2]

Is it correct that when ridge tiles are rebedded using mortar, additional mechanical fixing is now required?
Is there any exemption allowed for existing roofs...ie not new build?
If only a few tiles are being done, would this rule apply?
Thanks

 

[noseall]

Is it correct that when ridge tiles are rebedded using mortar, additional mechanical fixing is now required?

Not necessarily, no.

Is there any exemption allowed for existing roofs...ie not new build?

Most new builds use dry ridge fixing, these days. You will always see a diligent roofer adding clips or some such at vulnerable locations i.e. end rige, verge etc.

If only a few tiles are being done, would this rule apply?

The 'rules' won't apply to maintenance, no.

 

[^woody^]

The standard (BS 5534 2014) was clarified via a 2018 amendment, which specifically states that it does apply to repairs and maintenance. So yes, technically even a single ridge tile replacement would require mechanical fixing.

The only exemption is for heritage buildings.

It's a bit of a stupid situation, as for ridge tiles mechanical fixing will need a ridge batten, and potential removal of additional ridge tiles to fit such a batten.

There's a premise of doing what is "reasonable practicable", and not doing anything worse than what is there currently, and some manufacturers including the NFRC suggest a like for like for small repairs but a "meaningful run" or complete run of ridges should be mechanically fixed.

 

[noseall]

The standard (BS 5534 2014) was clarified via a 2018 amendment, which specifically states that it does apply to repairs and maintenance. So yes, technically even a single ridge tile replacement would require mechanical fixing.

Nonsense.
How on Gods gracious earth, would you mechanically fix a previously mortared ridge tile, on say a truss rafter roof? Use prayers and magic screws?

 

[^woody^]

Nonsense.
How on Gods gracious earth, would you mechanically fix a previously mortared ridge tile, on say a truss rafter roof? Use prayers and magic screws?

The clarification is there to see.

3rd page, 3/4 down

https://www.labcwarranty.co.uk/hubfs/Blog/Blog%20PDFs/labcw-tech-update-roof-tiling-and-underlays-the-new-bs5534-standards.pdf

Or see BS 5534:2014 + A2:2018

 

[noseall]

The clarification is there to see.

3rd page, 3/4 down

https://www.labcwarranty.co.uk/hubfs/Blog/Blog%20PDFs/labcw-tech-update-roof-tiling-and-underlays-the-new-bs5534-standards.pdf

Or see BS 5534:2014 + A2:2018

I'm not seeing the 'mechanical fixing of a single ridge replacement' sorry.