Our carpenters carry out the art of cut roofing. This is where the shape of the roof is cut by hand. We work out the rafter size with the use of trigonometry or by our ready recnor book.
We will fix the wall plates level and parallel and then commence by marking out the common rafters these form the shape of the roof. The angle of the roof will either be found on the drawing or matching the existing roof.
We can also construct more complicated roof structures where hips and valleys are within the roof structure.
We can form the openings for dormers and for Velux windows typical members called within a roof are wall plates, common rafters, jack rafters, hip rafters, and valley rafters, ceiling joists, purlins, binders and struts. Cut roofs can be formed in softwood as well as oak to form a finish article within the house itself. Cut Roofing - click for more info
These are constructed by means of being fabricated off site and brought to site and lifted into position.
They do sometimes have the advantage being quicker to erect than a cut roof.
Truss roofs can also be fabricated to form the space within the attic so forming the loft conversion. We can form dormer windows within the trusses and openings for dormer windows. Traditionally trusses are spaced at 600mm centres. Trusses can also be formed in softwood as well as oak to form king post trusses.
In architecture or structural engineering or building, a purlin (or purline) is a horizontal structural item in a roof.
Purlins support the load from the roof decks or sheathing and are supported by the principal rafters and/or the building walls, steel beams, etc. The use of purlins, as opposed to closely spaced rafters, is well known in pre-engineered metal building systems and some timber frame construction.
What is a Purlin?
In traditional timber truss construction purlins rest on the principal rafters of the truss.
In all metal or mixed building roof systems, purlin members are usually constructed from cold-formed steel, (or roll formed) Cee or Zed sections. The Zed sections can be lapped and nested at the supports which creates a continuous beam configuration between the bays.