1 2 brief we have been asked to carry out a sulphate attack investigation.
Sulphate floor testing.
3hg 2 so4 2 2h 2 o 4h hgso4 2hgo yellow this is a sensitive test and can observe even from the suspensions of barium or lead sulphates.
Although the request for a test is at the discretion of the individual surveyor.
The surveyor may not see any evidence of possible damage caused by sulphate action but will still ask for a test to be carried out due to the age of the property.
Sulphate floor tests are usually requested by surveyors when a property is being sold or remortgaged etc.
A sample may then be taken for laboratory analysis.
The property i want to buy has sulphate damage no insurance company will look at me as i cant get the sellors to do this before exchange of contracts it is a repossession property.
When mercury nitrate is added to a solution of sulphate ions a yellow precipitate of basic mercury sulphate hgso4 is formed.
A local builder would probably have no clue as to what must be done in regard to testing but then many.
We pride ourselves in offering fast efficient and reliable service.
A sulphate report entails breaking one or more holes through the ground floor slab and digging down to determine the hardcore thickness.
Also the structural engineer assures me that if the work is done properely that there will be no further problems.
In our region cleveland shale is the big name on the streets but in fact even in this region a property is more likely to fail from high sulphate concentrations in the in fill than it is from potential shale heave.
Sulphate attack is the most common factor regarding problems associated with deleterious in fill.
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Blythe building consultants have specialised in sulphate floor testing for over 25 years and have carried out over 16 000 tests.
The process involves taking a sample of hardcore from the property and having the sample analysed by a reputable laboratory.
This report gives guidance on sulfate attack damage to houses from the past use of sulfate bearing hardcore and infill material.
Excavation along with laboratory testing of recovered samples of both the concrete and the fill beneath the floor.
The legacy has been a continuing occurrence of damage to floor slabs and abutting walls as sulfate from the hardcore has.
If a damp proof membrane is present it cannot be fully reinstated and any surface finishes may be affected.
