Introduction to Hip & Valley Roofs

Ref: “Carp 12 Hip & Valley Roofing”Included as part of 2nd year text folders

M. S. MartinMay 2007

Revised July 2010

Look at the picture below and name whatever members you can

Good overview of components

Hip & Valley

With hip & valley, the two spans are the same

Broken Hip & Valley

Including dutch gables

With the broken hip & valley, the two spans are different

Easiest way to cut overhang

Hips & Valleys

• You already know hips bisect the angle of an external corner

• A Valley is formed in a pitched roof wherever an internal angle / corner is found on the roof plan

• The main roof is referred to as the “major roof” and has the major span

• What's known as the offset is the “minor roof” and has the minor span

• The offset is important, see next slide

Offset

Will create the gathering point for the valley – centre to centre of gathering points

These two distances are equal

New Members

• Valley Rafter P 31 – The valley runs from the internal corner to the minor ridge and forms the junction of the sloping roof members. On plan it will bisect the internal corner and has a plumb & edge bevel which are the same as the plumb and edge bevel hip rafter

New members continued

• Valley Creepers P 33– These are rafters running from a ridge to the valley rafter and have the same bevels as the other creepers and provided the spacing remains constant, the same difference in length.

New Members continued

• Broken Hip Rafter P 74 – This rafter joins the main ridge to the minor ridge and is part of a full hip rafter that would form the corner of the main roof before the offset was added

New Members continued

• Cripple Rafter or Crippled Creeper P 81– This runs from the broken hip to the valley rafter, isolating the offset and valley, it is a single line development of that portion of the roof.