Strengthening school buildings for earthquake resilience
Strengthening work on school buildings reduces their seismic risk. As a board of trustees, you can usually plan for it as part of other upgrades or modernisation work. Although timber-framed buildings present a lower risk, you can still take measures to improve their performance.
- Strengthening earthquake-prone buildings
- Strengthening buildings that are below 67% of the NBS but not earthquake prone
- Replacing rather than strengthening buildings
- Other types of seismic mitigation
- Funding for strengthening work
If you're thinking about undertaking strengthening work on buildings at your school, contact your property advisor.
Although timber-framed buildings present a lower risk and don't require assessment as part of the earthquake resilience (EQR) programme, you can still take measures to improve their performance. The best time to do this is when undertaking other upgrades or modernisation work at your school.
If buildings are assessed as earthquake prone, and require urgent strengthening work, we'll make a decision about whether to strengthen the building to:
- above 34% of the New Building Standard (NBS) immediately so the building isn't earthquake prone, and further strengthen to above 67% of the NBS at a later stage, or
- above 67% of the NBS straightaway.
Visit the Ministry of Business, Innovation and Employment's (MBIE) website fdor more information on the Government’s policy on managing earthquake-prone buildings.
If a seismic assessment shows that you have a building that isn't earthquake prone but is below 67% of the NBS, you should plan strengthening work on it when doing other upgrades or modernisation work.
When planning major projects with a designer/engineer, refer them to our design levels of earthquake resilience of school buildings page.
If strengthening and repair costs for a building are high, we may decide to replace the building instead. Before making this decision, we consider:
- the cost of repair against the cost of rebuild
- whether you have surplus buildings
- how important the building is in the schooling network
- your roll projections.
Replacing heavy tile roofs with lighter materials significantly reduces:
- the risk to life in major earthquakes
- the level of damage likely in a moderate earthquake.
Most schools with heavy roofs were identified during the 1998 national structural survey of schools. In most cases, the roofs have been replaced and specific structural strengthening has been completed.
If you have a heavy tile roof, we recommend you replace it as soon as possible. Tiles can be replaced with lighter roof material.
Use safety glass for glazing. If safety glass hasn't been used, we recommend applying film or some other means of retaining the glass to avoid injury if broken.
You need to pay for strengthening work using your 5 Year Agreement (5YA) funding. Unless the work is urgent, schedule this work for the same time as other upgrade or modernisation work on the building.
For buildings owned partly by the board and partly by the Ministry, use 5YA funding pro-rata to fix the Ministry-owned portion.
To pay for strengthening work on board-owned buildings, use non-Ministry funds, such as from fundraising or grants.
Our Board funded property projects page has more information.
If your school doesn't have enough 5YA funding
If your school doesn't have enough 5YA funding to pay for the strengthening required, talk to your property advisor for funding advice.
Different rules apply for schools that are part of the Christchurch Schools Rebuild Programme. The 5YA funding has been frozen for these schools while the programme is underway.
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