You can get them pre-built, all ready to install, in a variety of sizes
The walls and lip that goes under the roof coating have to be
watertight, bond with the coating and flex a little with it whilst
remaining watertight - which basically means plastic, aluminium or
fibreglass. They typically have a three part seal to ensure that water
cannot get past into the roof structure.
Unless you are in to making up your own fibreglass moulds or a bit of
aluminium welding, then buying a pre-built one is probably best..
Its a bit cheeky to some companies but when i have done construction on
things like skylights i get an idea of the one i want to go for first then
get in touch with a company and ask for the fitting instructions which
usually gives all the dimensions.Most skylight/rooflights are very similar
in build but some have a very slight difference that you need to accomodate
into your plans.Mind you the net makes it easier as a fair number of
companies now put a PDF download on their sites of fitting instructions
which gives a good idea.Shop around first though online to see which ones
you like,then get a copy of their instructions.Dont start cutting out things
before you have the specific detailing otherwise thats when you end up in
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