Replacing glass roof

[ronniecabers]

Hi, have a friend whose recently purchased a house and the house has a partial glass roof ( see pic ) . Now the glass appears to be 6mm standard glass from what I can see and has several cracks ( doesn't look like laminate glass ) which have been previously bodge sealed with silicone. My friend is looking to replace the roof as it is damaged plus its letting a lot of heat out. Has anyone any suggestions on what may be the best way forward.

Oh the roof seems to be self-supporting, not sitting on any parallel rafters,if anything joists are running ' horizontally rather than vertically

 

[catlad]

When you say best way forward! are you talking building a conventional roof with slates and a few velux skylights?

 

[ronniecabers]

Hi Catlad,

They would like to keep the area glazed with either glass or polycarb if possible

 

[Notch7]

Hi Catlad,

They would like to keep the area glazed with either glass or polycarb if possible

if that is float, annealed glass not toughened or laminated -I would be nervous of walking under it

It can be replaced with 24mm toughened double glazing

there are plenty of options here:
https://www.tuffxglass.co.uk/products/conservatory-glass/

you could ask tuffx for a local dealer who might be able to quote to supply and fix


you can get double glazed units up to 4 metres long

it will need proper capping bars, like exitex capex

Id be guessing the job could be £8k -£10k possible more in these times of mad inflation

 

[catlad]

Well it depends how much heat they want to save? 35mm polycarb on timber rafters with snapdown glazing bars would be a cheap option.

 

[ronniecabers]

Thanks for this,

My main concern is how to make it all water tight, as currently its pretty much level with the roof tiles at the top and the sides. I know 4mtr units are incredibly expensive and certainly wouldn't use ' H' bar joiners as they are useless and always end up leaking, and the main reason my friend thought clear polycarb

 

[ronniecabers]

@catlad , unfortunately no 'vertical ' timber rafters, only ' Horizontal' . As I've just said not sure how to make water tight at top and sides, as at the top the existing roof tiles overlap a lead flashing, modern systems seem to be too tall

 

[catlad]

Top should be fairly straight forward with a lead flashing detail once a few slates have been removed. The side, I would go with the right hand side detail on the picture, an F trim at that side of the poly should give a 40mm upstand to slate to and then you could use soakers over that and dress it down onto the poly.

 

[ronniecabers]

What about the lack of ' vertical ' rafters for the snapfix system to fit on? Would the horizontals be sufficient if just using clear polycarb? Or could ' noggins ' be used between each horizontal under the snapfix bars for added support?

 

[Mw Roofline]

You could use a self support poly system 35mm opal heatguard. Bars are 100mm high so you’d have to create a little mini flat roof valley at the top. You need at least 1 supporting purlin in the middle.

working with those slates though….

 

[ronniecabers]

Thanks for all the advice, they've decide to have the whole roof reslated with Delabole slate and remove the glass area completely and replace with 2 x Velux windos

 

[catlad]

Ok well a sensible option in my opinion. thermatically speaking.