Mundic is a Cornish word meaning mine waste. It consists of iron containing sulphur, known as pyrite often referred to as fool’s gold. In the era before 1952, concrete was not prepared by large national carriers. Instead, it was mixed at local sites with local materials.
This was quite convenient as far as the area of Cornwall is concerned. Cornwall is known to be a hard rock area and the mine waste was often used as an aggregate. Moreover, the use of granite and blue Alvin was effective for making the concrete hard.
It was also suitable because raw materials to manufacture and mould the traditional red clay bricks were not available. However, soon the mass production of concrete blocks became more common. Although, the use of local materials was not eliminated in block and foundation and construction until the 1960s.
The Mundic Block Problem
At the time, the choice for using Mundic for construction purposes was suitable but later it posed a significant problem. The aggregates were not put through an ore extraction process. As a result, the material was prone to contain minerals and chemicals. This lead to the deterioration of the concrete in the long run.
Nowadays, a concrete screening test is performed before a property is to be sold or a mortgage has to be taken out. The results can greatly impact the buying and loan decisions.
Affects of Mundic on Selling of Property
The screening test is divided into several stages and the concrete is graded depending on the results.
At this stage, several holes of 50mm in diameter are drilled and samples of concrete are taken out. It is tested for the presence of the suitable materials and hence placed into class A or C. If not, then further testing is required.
This stage of examination identifies result that can’t be defined during the preliminary stage. Hence, concrete is graded B.
At this stage, the performance of the samples is tested. Class B material can also be run through this stage if the surveyor and the petrographic are satisfied by the structural condition of it and not indicating any visible deterioration. Successful results are redefined as class AB.
Grade A means that the material is free of any harmful materials and is potentially mortgageable. Grade AB indicates small level of harmful material but not enough to pose a threat. Grade B means a high level of harmful material, may not be presently active but is a risk (through damp or becoming wet), hence not mortgageable. Grade C indicates some form of mundic decay and again unmortgageable.
365 Property Buyer will make a cash offer on any property affected by Mundic block. Enter your postcode or give our friendly team a call on Freephone 0800 019 7031 if you want to sell a mundic block property.365 Property Buyer have bought mundic block bungalows, mundic block houses and even mundic block flats!