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It's a dry valley, as shown in the installation guide linked in the OP https://hambleside-danelaw.co.uk/wp-content/uploads/2016/08/HDL_DFVT_InstallRecVs3.1_Mar24.pdf

I'm not 100% sure I follow, Here's a drone shot of my house partially stripped The 2 hipped sections at the bottom are extensions Zoomed in Is the wide board laid diagonally on the original roof rafters, with the extension rafters then sitting on top of it what you are calling a 'valley...

I was wrong. He's screwed the outer flanges of the GRP to the tops of the counterbattens. It certainly looks like it will have a neat enough appearance when it's finished, but to my mind as a humble DIYer it's a very bizarre way of going about it. Not only is it not sitting on valley boards, but...

Also, is the complete lack of any valley boards actually an issue or not?

Thanks, I've just spoken to him and the idea is that the GRP unit will get squeezed to pop in between the counterbattens and sit directly on the rafters, albeit not supported by valley boards in between. In my understanding, because the upstands on the GRP unit have a lower height than the...

Hi all, Having my house re-roofed at the moment and as usual, I've gone up on the scaffolding after coming back from work to look at what's been done (out of interest as much as anything else). Roofer knows I do this and is happy for me to do so. I'm a bit concerned about today's work...

Yeah, those 'many undisclosed reasons' is what I was asking - what might they be?

I don't mean plastic dry verges, I mean actual cloak verge tiles If you're getting re-roofed with new e.g. double roman tiles, why would you not have it done like this?

I'm getting my roof replaced shortly and I'm planning to have a cloak verge in either Marley Mendip or Modern tile type. Since I'll be getting mine done, I've recently been paying attention to other rooves and observing what other houses have, particularly those that have also been recently...

The term you're looking for is 'full body tile'

Hi all, I've been doing a bit of work on my landing and into an upstairs extension room. Pulling up the bit of chipboard in the doorway reveals the below situation The existing arrangement is that the bit of chipboard that sits in the doorway and covers the exposed masonry, is supported by...

Hi all, I'm currently looking at getting my roof redone and have a had a couple of guys round to quote. One of these guys explained that as my house is about 60 years old and the roof is original, the tiles (concrete marley double roman) are basically end of life and probably letting water...

These little £$%^s have decimated my box hedge as well. I sprayed Bug Clear Ultra 2 last year and managed to see them off long enough for the plants to mostly recover. However they are back this year and because it just won't stop raining for longer than say 6 hours, I can't spray again, so...

That seems like squid ink. I can see from a quick wikipedia skim that he studied greylag geese and jackdaws and I confess I'm not very well read on the behaviour of greylag geese and jackdaws, however it's very well observed, known and understood that in primates such as chimpanzees and...

That's not even close to true, in group and out group distinctions within a species are very clear in the animal kingdom and extreme aggression between them commonplace.

That doesn't mean it's meant to be like that. Where the arrow is looks like the gap between the fixed channel and pivoting bit. Clearly water is going to go down there. If you silicone all the way round both sides then the water exit whichever side is the path of least resistance. That's why...

Why do you want the silicone bead to go all the way around anyway? Shower screens/frames are usually supposed to be left unsealed on the inside so that any water/condensation can run out into the tub

Could you expand on this a bit please for someone who is looking at getting his roof redone? What is considered high quality membrane and what is low quality?

So edgy, so counter-cultural!

Reply from DEFRA, bold emphasis mine. OK so end of the year apparently. We'll see.