Many slope in several directions like squashed hip roofs toward scupper holes that connect to downspouts.
Flat roof fascia construction.
Then cover all of your nails with the putty as well.
For additional stability you can also use steel joists that are built into one or both of the walls.
Flat roofs usually come with a 10 to 20 year warranty but can last 25 years if you build the roofs right and maintain them using commonsense rules.
Mix the filler with a putty knife on a flat sheet of cardboard or on a plate and scrape it onto your fascia board.
The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.
A waterproof exterior layer is essential and there are a number of options including bitumen based felt or asphalt epdm rubber and pvc based systems as well as cold applied liquid systems bitumen coverings.
Other flat roof construction details often refer to the types of flat roof coverings.
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This will give additional stability to the roof structure.