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Would have thought you could do that without issue as long as moisture can't get between the layers by using a good VCL below the rafters. Odd spec though

Small comment on above posts, as you say it's a dormer I'm assuming it is mid roof so the valley doesn't meet the main eave, if so remember you will need saddles at the top and bottom of the valley with GRP, by the time you buy the lead for the saddles it may well end up costing the same as...

Ditto to noseall but if you mean the perpendicular height at the top of the pitch you'll need a trig calculator which can be found on google OR use the tried and tested estimator method with a piece of paper, protractor and a ruler, lot quicker and easier

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If you are getting multiple quotes that are around the same within 5-10% then that is the right price.

There are options depending on the tile you have, Klober make some vision tiles but you could look at using Sun-pipes if it is just a light issue and you aren't needing a view

You just need a universal dry vent system, there are a fair number available such as from Klober. It probably won't be quite so easy though as just removing the ridge and putting back with the system in place as a ridge timber (batten) will need to be installed along with straps fixed to the...

The way we do it is to use a plastic tube fixing, for a 200mm thick insulation this would require a 180m tube and 75mm fastner. The same tube system in a mech fix single ply system are used to fix the laps Click this link to see what I mean...

We use a product called Masterform from a company called Nicholson in London, not the cheapest by far but it is very good and very versatile, easier to use than Ubiflex and the big plus is it can be used in flat areas such as small flat top porches and parapet gutters

Should ideally be 12" wide slates at that pitch but for a bay it prob won't be a big issue

Horses for courses really, prob cheaper to do it once over a long period using the torch-on rather than twice in the same period for shed felt

Every single roof we do nowadays we supply and fix a breathable underlay such as Tyvek Supro or Klober Permo Forte. It is a very very rare occurrence to see a spec for non-permeable now. There are some cheaper membranes available as you say such as the lightweight ones but these are more...

All of what Woody says. We give a 10 year workmanship guarantee and mention any guarantee given by the manufacturer but say that the guarantee is valid only for faults directly attributed to poor workmanship and not caused through any structural movement or Acts of God. This is usually...

Am assuming this is a pitched roof. The only other way would be lots of loft quilt or a combination that and and PUR (Celotex) though as you have it between rafters this points towards a sloping ceiling situation so sound like you're stuck with the specified system (ps Celotex and similar are...

I've never heard of solar panel installation needing any beefing up of the roof timbers, bear in mind that the load is spread quite well across the panel frame. If you are that concerned you could get a structural surveyor to take a look, wouldn't think it would cost too much in comparison to...

no reason to seal them as far as I know

Blimey, they're not going to go ANYWHERE when you do that! lol You should though only need to hook fix really. Didn't even realise that the Spanish quarries produced 8mm slates (mind you, no call for them darn sarf)

Not the easiest to make out but am I right that the tiles do not oversail the gutter? If that is the case, in the long term it is a bigger job than just fitting underlay support trays though that will help

It was always a standing joke here that the granules for granular tile will turn up on a separate delivery so no surprise that the granules are coming off of the tiles, they are only stuck on so over time do come loose, don't worry about it

standard thing for the levels to be out surely (considering the amount of jobs we go to with the same issue), we even had one that was out and it had a steel frame!!!