INTRUSIVE FIRE RISK ASSESSMENTS (Obstructive Building Survey)
Also known as a Compartmentation Survey these types of Assessments, as detailed in Local Government guidance 'Fire Safety in Purpose Built Blocks of Flats and Residential Buildings (May 2011), comprises of a review of the fire compartmentation between units, the common areas, service risers and roof voids.
Type 2 Fire Risk Assessments
A type 2 is similar to type 1 FRA in the sense that it only includes the common parts of the building. However, it involves an element of destructive sampling for which a contractor will normally be required.
Type 4 Fire Risk Assessments
A type 4 FRAs, like Type 2, include a destructive assessment, however in this case of both the common parts of the building, and the flats. Type 4 FRAs are obviously more complicated than the other types of assessments.