Provide venting to each wall cavity.
Flat roof flashing height.
The 8 inch height prevents water from pouring over the top of the flashings into the building or system.
Minimum of 12 to top of parapet.
Typically 10 by 8 inch 253 mm x 203 mm flashing is chosen.
This dimension should be measured from the finished surface of the roof which would.
Vertical flashings must be a minimum of 8 inches above the completed roof surface.
What typical detailing methods are used to seal flat roof penetrations.
Banding is typically used to seal soil vent pipes on single ply roofs such as fdt rhepanol pib and involves wrapping an unreinforced membrane around the pipe to a minimum height of 150mm.
Do not lap tpo over top of parapet unless required by unique construction conditions.
Which would include abutments rooflights and service vents etc must have a minimum height of 150mm.
Height of roofing at wall.
This height has become the industry standard and is recognized by most membrane manufacturers.
The gibraltar building products l flashing protects your home the gibraltar building products l flashing protects your home from moisture infiltration where your wall meets your roof.
An approved sealant is then applied to the top of the membrane upstand before it is tied off with a jubilee clip.
Venting in wood framed parapets.
Top of parapet below cap to be sealed with fluid applied flashing.
Typical methods include banding pitch pockets and cover flashings.
Bs 6229 2003 flat roofs with continuously supported coverings code of practice and bs 8217 2005 reinforced bitumen membranes for roofing code of practice both state that if unwanted water ingress into the building is to be avoided all weatherproofing upstands occurring around the roof area.
