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Slates or tiles to match
Various ways to drain
Can be frameless
Modern 'Mansard' - a flat roof on top of a slated or tiled pitch
Recessed or ‘sunken’ Mansard - the flat roof that looks like a pitched roof
A warm deck maximises the useable internal volume:
Really only practical because Permadeck can encapsulate the whole roof seamlessly.
Can be a balcony surface with full or half height upstands topped with a railing.
If used for a dormer, the falls can be taken back to the pitched roof where the
water runs off down the side valleys. Downpipes can go through soffits or angled
through to the gutter or a hopper head on the wall.
Adds character to a flat roof
The possibilities with Permadeck are endless.
Whatever the shape you have, Permadeck will encapsulate it - permanently!
Conventionally the decking stops where it meets the sarking but this causes lots of problems when you come to waterproof the roof AND it can look awful. Below you will see the decking projected over the sarking 150 - 200mm with a fillet or rail fastened below. This fillet then carries the lead or Ubiflex that dresses over the slates or tiles without having any lead lying on top of the roof. The Permadeck edge trim then covers the lead forming a weathertight seal and an attractive border to the top of the slates or tiles just like a ridge flashing does at the top of a normal pitched roof. All sizes are a guide only and should be checked on site. A recessed or ‘sunken’ mansard uses a similar detail and is a great way to transform an existing flat roof.
This is what it looks like in practice; this recessed mansard is also a balcony,
hence the posts. NB This roof had additional trims on the inside top edge to add
to the appearance.
In the beautiful Tay valley at Aberfeldy, this was a refurb of a standing-seam lead
mansard roof that had corroded. The timbers below the standing seams were extensively
rotten. We could have simulated the standing seams but since the roof is out of sight
this wasn’t necessary.
Look carefully and you’ll see the old ‘lead steps’, ridge beam, and round rooflights;
all very easily moulded into the Permadeck system.
The Art of Permadeck:
With a slope back and to the sides this sunken mansard was so simple to build yet
gave a stunning appearance. The eaves on this roof are extra deep to keep rain off
the windows and the main roof has an older Permadeck ‘walkway’ for easy access along
the length of the building.