Clean rising walls of contamination. Once the problem is confirmed to be pyrite, a solicitor should be consulted to review the various contracts, guarantees or warranties and insurances in place, and to establish whether legal action should be taken to recover costs for the work from a third party. Removing the contaminated pyrite backfill is an expensive operation and in most cases will involve supporting the existing first floor, roof structure, removing the ground floor concrete floor, partition walls, replacement and removal of all plumbing fixtures, heating and electrical systems in the affected area, before the contaminated pyrite backfill can be removed. In the presence of moisture and oxygen, pyrite oxidises and produces sulphuric acid. The drop down menu at the top will help you find a topic of interest or you can If you have any questions about the site, head over to the. The Irish story In Ireland, the pyrite problem was first identified in 2007. This chemical reaction produces sulphate and can form gypsum, whose crystalisation will cause the stone to burst, the backfill to swell and the concrete itself to crumble and swell.
No, other then the financial and other stresses it leads too. The guide sets out to provide further information to applicants whose dwellings have been included in the Scheme. Strictly speaking, damage caused by pyrite is not isolated to the greater Dublin area and has been recorded worldwide. The Pyrite Resolution Board only accepts online applications. This swelling will result in cracks in the foundations and rising walls around the property.
Where pyrite is present in building materials — such as backfill used under floors — the mineral swells over time causing buckling in concrete floor slabs, difference in flooring levels, cracking in internal walls and sometimes movement in outside walls. The buyer would normally include in the contract documents that the vendor obtain a pyrite test to determine if there is a current or future risk of swelling under the concrete floor slab in the house or new extension. These cracks are normal when concrete floors dry out too quickly. It is the responsibility of the home owner to prove a case of pyrite heave. Mobile homes, vehicles or vessels. If the depth of the backfill under the floor slab is significant and the percentage of pyrite contamination in the backfill is on the higher side, the foundations and rising walls may not be strong enough to prevent horizontal expansion, thus resulting in foundation spread.
Medical opinion suggests that the quantities of sulfuric acid are too small to cause health problems. For those homes with a high risk of damage, they will be designated as such under the new Standard. Then got my own builder in to address the issue. When pyrite is exposed to oxygen and moisture it oxidises and produces sulphuric acid which then may react with calcium carbonates in the backfill to form gypsum which results in the swelling of the backfill. Buying Your New Home When buying a house you should make sure to have a structural survey carried out first. He expects repairs to take around 12 weeks.
The speed of reaction will depend on the depth of the backfill, the extent of the pyrite within the backfill and the amount of oxygen and moisture available to allow the reaction to take place. The damage that pyrite backfill can cause is an expensive defect to remedy and stressful to the property owner. If you do not make a return and tell Revenue that your property is exempt, the Revenue Estimate may become payable. Cracking and bulging of internal partition walls. In a number of high profile cases which have already gone to the courts it would appear that the courts are taking the side of home owners if contaminated pyrite backfill has been found under their floor slabs. If you are looking to secure a mortgage on the property your bank will require a green cert if there are indications of pyrite contamination in the estate or surrounding area.
The minerals illustrated sold previously and are for photographic reference only. It is not unusual for cracks to be visible in foundation walls, structural walls and floors in your home that have no relation to pyrite. The minerals on this site are presented for reference purposes only. How to apply To claim an exemption, you must complete your Local Property Tax Return and indicate the exemption condition you satisfy the lists each condition. The last house I bought had pyrite. In its natural state, the pyrite mineral remains un-reactive.
When we realised there was a problem, we put off having a family in the house. This involves coring a hole through the floor slab and removing the backfill for chemical analysis testing. The Minister for Housing Eoghan Murphy welcomed the revised standards. This is due to a chemical reaction that can cause pyritic backfill to swell. In addition to the structural damage associated with pyritiferous heave of the sub-slab fill material, porous concrete exposed to thaumasite, water and carbon dioxide may experience sulphate attack which renders the concrete structurally weakened. Conclusions The pyrite problem is significant, and very worrying for those householders affected. The Standard not only had to consider the characteristics of the fill itself but also the extent of structural damage in the building, whether the damage was progressive and whether it was caused by pyritic heave.
The presence of pyrite in the backfill will cause the concrete floor slab to lift and crack over the swelling backfill. No, we are currently establishing a database of contractors who can carry out pyrite repairs as per the system that operates in Canada. Pyrite is a sulphide material that occurs in many sedimentary and metamorphic rocks. Crack between external wall and slab at external door threshold. Residents of two housing estates in , north Dublin and , Co Meath had waited up to six years to have the serious structural problems fixed and were forced to move out of their homes for months to allow major work take place. Surveyors will undoubtedly be involved in identifying and remedying damage to pyrite-affected houses, and in advising householders and other building owners on the more complex issues arising in relation to insurances and contractual liabilities. What if I have a number of cracks in my concrete floor, do I have a pyrite problem? Cracked concrete and porous concrete such as medium and normal density masonry blocks are most at risk of sulphate attack when the sulphates become suspended and transported in water.
When the sulfuric acid in the backfill reacts with the concrete floor slab, the underside of the concrete floor slab will swell from sulphation and begins to breakdown and crumble. There are estimated to be a greater number of extensions that have been added to older properties then there are new houses built using contaminated pyrite backfill. There is no hard and fast rule as to when Pyrite will activate. However, swelling can begin to occur after as little as one year, if oxidation of pyrite has already started during construction. There are more cases coming on stream all the time.