Territorial Complience
What was meant to happen?
Premade wall frames and trusses are supposed to be made with load bearing timber, usually of MSG6 (machine stress grade) or greater this will measure the stress forced upon the time until breaking point and then give it a grade with maximum being MSG12. The most commonly used timber is MSG8 which is identified by having a black paint mark throughout the surface of the timber, these grading are in accordance with NZS 3613 NZ timber grading rules.
What did happen?
In some cases back in 2007-2008 inspectors and builders were sometimes finding that non-load bearing timber has been used in the pre fabrication of timber wall frames and trusses and therefore the framing does not comply with the building code clause B1 structure. These incidents only occurred in the Auckland-Northland regions, they occurred only on very isolated incidences.
Why did it happen?
These incidences happened according to the timber industry because there is not a high enough extent of consistency on how to mark the timber for the correct grading within the industry. What was happening was they were getting red marks (which in general indicates VSG4 and would mean that it is not suitable for load bearing.) on some of the timber, even if it was stress graded to the appropriate level. Carter Holt Harvey even stated that some of the load bearing timber had been contaminated with red paint marks.
What did they do to fix it?
The Department of Building and Housing(DBH) and Territorial Authority inspectors had inspected the timber and verified that it would not cause any issue with the load bearing properties of the wall or trusses and that there could be more flex in the wall or trusses, but that it will not jeopardise any safety of the building.
References: DBH http://www.dbh.govt.nz/bofficials-code-non-
load-bearing
What was meant to happen?
Premade wall frames and trusses are supposed to be made with load bearing timber, usually of MSG6 (machine stress grade) or greater this will measure the stress forced upon the time until breaking point and then give it a grade with maximum being MSG12. The most commonly used timber is MSG8 which is identified by having a black paint mark throughout the surface of the timber, these grading are in accordance with NZS 3613 NZ timber grading rules.
What did happen?
In some cases back in 2007-2008 inspectors and builders were sometimes finding that non-load bearing timber has been used in the pre fabrication of timber wall frames and trusses and therefore the framing does not comply with the building code clause B1 structure. These incidents only occurred in the Auckland-Northland regions, they occurred only on very isolated incidences.
Why did it happen?
These incidences happened according to the timber industry because there is not a high enough extent of consistency on how to mark the timber for the correct grading within the industry. What was happening was they were getting red marks (which in general indicates VSG4 and would mean that it is not suitable for load bearing.) on some of the timber, even if it was stress graded to the appropriate level. Carter Holt Harvey even stated that some of the load bearing timber had been contaminated with red paint marks.
What did they do to fix it?
The Department of Building and Housing(DBH) and Territorial Authority inspectors had inspected the timber and verified that it would not cause any issue with the load bearing properties of the wall or trusses and that there could be more flex in the wall or trusses, but that it will not jeopardise any safety of the building.
References: DBH http://www.dbh.govt.nz/bofficials-code-non-
load-bearing
Recent Comments