wantgasil.blogg.se - South african thatched roofs

#SOUTH AFRICAN THATCHED ROOFS FULL#
#SOUTH AFRICAN THATCHED ROOFS SERIES#

The new regulations have simple line drawings for: The illustrations above shows some of the most usual configurations. The trusses themselves are made up of rafters, tie beams, posts and struts, all of which are assembled according to a specific design. Illustration courtesy The Complete Book of Owner Building in South Africa They will be either nailed or bolted together on site, or delivered to site on order by a specialist truss manufacturer. These rest on wooden wall plates, and are designed to span the walls of the house.

#SOUTH AFRICAN THATCHED ROOFS SERIES#

More often than not, the roof structure is assembled from a series of roof trusses. Roof design depends on a number of factors including the type of covering you are going to use, and the span over which the roof structure is to be supported.

#SOUTH AFRICAN THATCHED ROOFS FULL#

You’ll find the full list in Part L of SANS 10400 (or check with an SABS librarian for the relevant information). SANS 2001-CT2, Construction works Part CT2: Structural timberwork (roofing).SANS 1783-4, Sawn softwood timber – Part 4: Brandering and battens.SANS 1783-2, Sawn softwood timber – Part 2: Stress-graded structural timber and timber for frame wall construction.

SANS 1701-2, Sawn eucalyptus timber – Part 2: Brandering and battens.

SANS 1701-1, Sawn eucalyptus timber – Part 1: Proof-graded structural timber.

In addition there are standards that relate to roof coverings and other elements. There are several South African National Standards (SANS) that relate to roof timbers, all of which must be complied with when roof trusses and other roofing elements are constructed. Also be acutely aware that circumstances vary from site to site. Since anybody building a house MUST either BE a “ competent person” in terms of the regulations, or must EMPLOY a “competent person” to put in plans and oversee the building operation, either you or the person you employ should purchase the updated section of SANS 10400 Part L Roofs from the SABS to double-check details and specifications. It’s just because the different new sections were published over a period of years that has made it more of a challenge for many. Any qualified designer knows that every one of the SANS that form part of 10400 needs to be considered as a whole. In addition, the new SANS remind designers and builders that other sections are also vitally important when it comes to roof design, including Part A: General principles and requirements Part B: Structural design Part C: Dimensions Part R: Stormwater disposal Part T: Fire protection and Part V: Space heating. For instance, where any roof is to be supported on the wall of a building as described in the relevant section of Part K: Walls, the roof MUST be constructed in accordance with the rules laid out by the relevant SANS (in this case 10400). General Rules for the Construction of RoofsĪs with most of the National Building Regulations, those that apply to roofs relate to SANS other than the one specific to that particular element.

It’s not so much that they’ve changed, but rather that the guidelines are now much more comprehensive and useful.

While the legislation changed in 2008, it was only in 2011 that Part L: Roofs was published by the SABS.

The South African National Standard for Roofs This last one, though, is open to interpretation as not all roofs incorporate ceilings as such. Lastly, the General Requirements specify (as they did previously), that the roof should be designed “as part of a roof and ceiling assembly” and should provide “adequate height in any room immediately below such assembly”. In addition, the roof should be “adequately anchored against wind uplift” which was not covered in the previous edition of the regs. Instead of simply being “durable and waterproof”, roofs are expected to be “durable” and should not allow “the penetration of rainwater or any other surface water to its interior”.Īs previously, roofs must “not allow the accumulation of any water” (but not simply rainwater, which was the limit of the old building regulations) “upon its surface”. In simple language, if there is a major wind or some other really horrible weather conditions (God forbid), the roofs of our homes are expected to be able to stay on the house and protect us from the elements without themselves being damaged. When the South African National Building Regulations were updated by the Department of Trade and Industry in May 2008, the General Requirement relating to Roofs was changed to incorporate certain safety elements.įor example, instead of simply having to “resist any forces” to which the roof might be subjected to, the regulations now state that “The roof of any building shall be so designed and constructed that it safely sustains any actions which can reasonably be expected to occur and in such a manner that any local damage (including cracking) or deformation do not compromise its functioning”. Building Regulations as They Apply to Roofs-Part L