Pitched Roof Wall Plate Detail

A cut roof this is the traditional method of cutting the timber on site and building up the roof using rafters ridge boards joists and purlins etc the exact details being determined by the size of roof size of timbers etc.

Pitched roof wall plate detail.

Pitch is the slope or angle from the wall plate to the roof ridge line. They are cut to the same length as the brickwork they sit on a half lap joint is great for the corners to be fixed to. Setting out the roof wall plates the extension project is now up to plate level so it s time for pythagoras theorem. Which is equal to 1 4 or 1 3 the total span of the building not counting any overhang.

There are two basic methods of pitched roof construction. Their length is determined by the length of the wall plate to the ridge. The wall while the horizontal strut loads cancel each other out if the roof is symmetrical. Pitch can vary a great deal from a shallow slope up to a very steep pitch.

Fixings used to connect the roof structure to the wall plate should be specified according to the roof construction and exposure of the site. The trusses are secured to the wall plate using galvanised steel truss clips. Pitch is nothing but slope of roof with the horizontal plane and is calculated as the ration of rise to. The vertical distance or height of top of ridge from wall plate is called as rise.

Pitch for a gable roof the most common is generally 1 4 or 1 3. Getting the wall plates or top plates as they are sometimes called right is important because all the ceiling joists roof rafters hips etc. And these are generally made of wood and are used to fix the common rafters. The bracing is placed length ways and also diagonally across the trusses.

In order for all the roof components to work they must be square parallel level and fixed down properly. Where trussed rafter roofs are not subject to uplift a minimum of two 4 5mm x 100mm galvanized round wire nails skew nailed one on each side of the trussed rafter or truss clips fixed in accordance with the manufacturer s instructions are acceptable. B 1 3 cut roofs purlin details support at wall plates the rafters are usually birdsmouthed over and skew nailed to the wall plate although other. Plate level is the timber plate which is going to hold the roof structure including the roof joists hips and roof rafters.

Colm flynn 2013 flat roof roof surfaces which are pitched at 10 degrees or less are classified as flat roofs. Wall plates shall be bedded to distribute roof loads and fixed to prevent wind uplift roof construction details should be available on site particularly for combination and specialist roofs. Eaves detail the eaves detail shows where the roof members and coverings. First of all there are many details to pitched roof types that can make construction more complex.

The extension part 7. There are ridges eaves hips abutments and the centerline of the ridge. Pitched roof construction. Wall plates are provided at top of wall or supports.

These are nailed to a wall plate at the top of each supporting wall.