Leaking Flat Dormer Roof - Help Fixing!!

Or Hardiplank cement board (there are other brands. That was the first that came to mind)

I was looking at both the Hardie Plank and the Marley Cedral Click. The issue with the Hardie Plank is that it looks like it needs a nail gun to install (which I don't have). The Marley Cedral Click looks good with it being Tongue & Groove but it's quite expensive, especially with all the other fittings that you seem to need (starting plates, special clips, various pieces of aluminium trim which are like £30 per metre).

UPVC cladding seems like the cheapest option but I really dislike the look. Still undecided.
 
Get some Black Jack 905 roof coating and paint it on. It does the job. I did my bathroom roof with it.

You can get it from Toolstation (https://www.toolstation.com/shop/Roofing+&+Drainage/d250/Roof+Compound+&+Waterseals/sd2809/All+Weather+Roof+Coat/p60252?bvstate=pg:2/ct:r) cheapest place or from Amazon.

Good video on YouTube too.
Saw this video and thought id test the BlackJack stuff out on a porch roof. I regret starting it in direct 30 degree sunlight.... drying very quickly!
 
^^^^ Good idea about getting rid of the flat roof.
Best thing that we did was to get a fully pitched and tiled roof for the garage and kitchen. They previously had flat roofs and I had re-felted and patched them up over the years.

A few years ago the flat kitchen roof was dripping water in and I went up and faced a duck pond up there. As I was brushing off the water I fell through the kitchen roof. I was stuck there up to my arms with a lake of water running round my body and down into the kitchen

That was a mess.

We then got a "proper roof" fitted :)

Some tradesmen wanted more to do another flat roof rebuild than we paid for the pitched roof.

No issues since, should have done that years ago.
 
I was looking at both the Hardie Plank and the Marley Cedral Click. The issue with the Hardie Plank is that it looks like it needs a nail gun to install (which I don't have). The Marley Cedral Click looks good with it being Tongue & Groove but it's quite expensive, especially with all the other fittings that you seem to need (starting plates, special clips, various pieces of aluminium trim which are like £30 per metre).

UPVC cladding seems like the cheapest option but I really dislike the look. Still undecided.

I know, it's irritating having to buy extra bits to make it look nice and do a proper job. I suppose you have to weigh up if you want a cheap solution that you're not keen on the look of or a more expensive one. Even the wood effect UPVC stuff looks 'plasticy'.
 
I know, it's irritating having to buy extra bits to make it look nice and do a proper job. I suppose you have to weigh up if you want a cheap solution that you're not keen on the look of or a more expensive one. Even the wood effect UPVC stuff looks 'plasticy'.

Agreed. I'm now looking at Cedar which although a fairly expensive option, it's coming in around a similar price to the fibre cement boards. After lots of measuring, quite a lot of the dormer uses quite short lengths (<1.5m) and I've found places selling offcuts at this length at a reduced price. Tempted to go with this option.
 
Agreed. I'm now looking at Cedar which although a fairly expensive option, it's coming in around a similar price to the fibre cement boards. After lots of measuring, quite a lot of the dormer uses quite short lengths (<1.5m) and I've found places selling offcuts at this length at a reduced price. Tempted to go with this option.

Cedar would work, certainly if you’re buying off cuts to fit odd spaces.
It goes a silver colour when it’s weathered so if you’re happy with that it’s great, if you paint it though you have to keep painting it to maintain the appearance.
 
Cedar would work, certainly if you’re buying off cuts to fit odd spaces.
It goes a silver colour when it’s weathered so if you’re happy with that it’s great, if you paint it though you have to keep painting it to maintain the appearance.

I think the silvery grey weathered look would look good anyway as we have mainly anthracite windows and front door. The soffits, facias and guttering are going to be anthracite too. So the grey colour would work.

I'm going to protect it with Osmo UV oil too before it goes up. It probably won't get another coat after that so nature can take its course.
 
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