![]() If the slope is less than 30 degrees, the maximum truss/rafter centres should be 760 mm. 30 x 1,2 mm galvanized strapping may only be used for light roofs.Two strands of 4 mm diameter galvanized steel wire may be used for all heavy roofs, and for light roofs with a slope of less than 15 degrees, and minimum truss or rafter centres of 760 mm.There are different types of anchors that may be used to fix the roof trusses: The legislation states that, “Where any roof truss, rafter or beam is supported by any wall, provision shall be made to fix such truss, rafter or beam to such wall in a secure manner that will ensure that any actions to which the roof may normally be subjected will be transmitted to such wall”. While Part L: Roofs of the National Building Regulations gives guidelines for the way in which roof trusses should be constructed, and the degree to which roofs should slope, it is Part K: Walls that covers (albeit briefly) “roof fixing”, in what is termed “empirical rules for walls”. But it is just as important for any roof to be able to resist any forces that it would normally be subjected to – particularly wind – which is why you need to anchor any roof structure so that it doesn’t blow off. ![]() This is why roofs need to be waterproof and able to prevent water from accumulating on the surface. The roof of a house is ultimately what keeps us protected from the elements.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |