FLUING THROUGH SLATE TILED ROOF

[DAV1D]

Last week I visited a terraced house which I went to to give a quote on installing a complete central heating system.
Where the owner wishes the boiler to be installed requires the flue to extend through the the slate tile roofing.

Having not carried out this particular job before, is there an easy method of cutting the the required diameter hole,(obviously this will be elliptical)
thus ensuring that the flue sealing plate will provide a water tight seal. Will a require any special tooling i.e slate ripper etc?
Do you necessarily need to strip out numerous tiles to satisfactorily complete the job in question, if so what would the correct procedure be?

Also could you inform me how access to the work area may be safetly accessed with a roof type ladder i.e. How ladders may be secured to ensure no nasty accidents?
Please note that I am a CORGI registered gas installer

Best
regards
DAV1D

 

[paul1]

there is a product on the market called a deck tight or their are other things available which can be purchased from either travis perkins or the builder centre / control centre /plumb centre they are very easy to use and do a good job as well as looking good