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What sizes are the roof lanterns available in?


We manufacture to any plan size and shape but standard sizes are more economic.


Who will install the roof lantern?


As far as the preparation work is concerned the roof latern (whether it be an existing roof or a new roof) Kings Permanent Buildings have their own team of competent builders.  It will be necessary to create the necessary aperture (strengthening if necessary), create an upstand/kerb for the roof lantern to sit on, lining out the aperture as appropriate and making sure that the roof surface material is carried up the outside of the upstand/kerb correctly.


White powder coated aluminium glazing cappings or painted timber?


For the majority of applications we recommend the white aluminium glazing cappings which have a neat moulded section and are maintenance free.  These we supply as standard unless requested otherwise.  Should yuo however, prefer a slightly more traditional glazing capping then painted timber cappings are available at no extra cost.  Just let Kings know.


What size roof lantern should I have?


This is a rather subjective question depending on usage of the area below, personal preference, amount of light required etc.  It is surprising the amount of slight that even a 3 'x 3' roof lantern will let in.  From our own experience we have found that a roof lantern 6 ' x 4' in size gives an excellent area of light and the feeling of space above for a medium sized room.


Remember that the upstand/kerb on which the roof lantern sits needs to leave adequate clearance all round for general maintenance purposes of the roof.  Ideally 150-300mm minimium clearance is required although you might get away with a bit less than this.


What dimensions should the roof lantern supporting upstand/kerb be?

Where are the roof lantern measurements taken from?


The measurements for the roof lantern are taken at the external face of the supporting timber upstand/kerb.  This allows us to construct the lantern cill with the correct overhang for weathering purposes.  The actual thickness of the support timber upstand/kerb only need to be 50mm plus whatever felt, asphalt etc is needed for the outside and perhaps plasterboard with a finish on the inside.  This is perfectly adequate for a small to medium sized lantern.  For larger roof laterns 100mm  thick (or larger, depending on insulation etc) upstand is more suitable.  Ideally the top of the upstand/kerb (bottom of the roof lantern cill) is a minimum of 150mm above the finished roof surface.


What about ventilation?


It is well worthwhile considering whether ventilation is required.  Consider whether the space below is south facing, whether it has opening windows, is it perhaps an area such as a kitchen?  There are three options for ventilation :-


Trickle vents


These are available in powder coated aluminium and allow a small amount of air movement.


Top hung opening sashes


These are available if the roof lantern has side lights.  They can be opened either manually (with a pole) or by electric motor and switch with or without various automatic control options.


Opening sklylights - If the roof lantern does not have sidelights it is possible to ventilate using powder coated aluminium top hung skylights.  Aesthetically, skylights do break up the purity of line to some extent.  This is more noticeable on small roof lanterns since the frame of the skylight does take some of the light.  Having said that the particular design we use works very well and is fully storm proof.  Either manual or electric operation is available.


Roof lantern maintenance.  How often will I have to paint it?


The microporous painting system that we use is a far cry from traditional painting systems and has extremely good durabiliyt.  It is unlikely that you will have to repaint for many years (even in exposed coastal climates) and then all that shoul d be needed will be a light sanding down and the application of another good coat of microporous paint.  Powder coated aluminium glazing cappings make the roof section virtaully maintenance free.