What is this type of roof called?

Question

Hi all,I am planning the construction of a porch extension. I want to tile itto match the rest of the house, rather than having a flat roof, but asit will extend about 1.5m away from the house, the pitch will be toolow. To increase the pitch a bit, I thought about doing something likethe following: putting in the flat bit on top, I can increase the pitch. Does thistype of roof have a name? Without knowing its name, it's quitedifficult to find out any more details about it, such as how toconstruct it.thanks,dan.

soup · Accepted Answer

A variation on a Mansard roof?Is the 'Flat bit at the top at a minimal slope (to clear water) but looks flat from the ground?(IANA roofer)

RubberBiker · Answer

The lower portion is called a "mitred slate hip" - probably withconcealed lead soakers.The upper portion you could just call a "flat lead roof".

Dave Plowman (News) · Answer

In article,   RubberBiker  wrote:Or a recessed zinc one?

RubberBiker · Answer

Ah - I didn't look carefully enough, you're probably right!

Malcolm · Answer

Had this problem with a ground floor extension. We wanted to match the roof tiles bur the slope was too shallow so the Architecht specced an under layer of Onduline sheet (a corrugated sheet). Waterproof for the last 7 years although somewhat exposed to the west.

Malcolm

The Natural Philosopher · Answer

The permissible angle of a roof is down to what its made of. Utterly impermeable surfaces like zinc or lead can be flat, thatch needs 50 degrees or so.

However even flat laed will tear in the cold due to shrinkage. So its conventional to use a lapped expansion joint and some slope.

What is this type of roof called?

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