Improperly installed vent flashing can cause substantial damage to a roof. Improperly installed flashings are common when being installed on an existing roof when a bathroom fan is added. It is common to see these installed on top of the roof shingles with sealant applied around the edges. Properly installed, the flange of the vent should be below the shingles on 3 sides, leaving the lower edge exposed on top of the shingles. The attached document shows the correct way to install vent flashings.
It is common for a roof truss to be damaged during construction of a new home. Repairs are common but must be supervised by a structural engineer who will issue an engineering report and recommend ed repair. Roof trusses should not be field repaired without proper documentation by a structural engineer. The attached document show what a typical engineering design for repairs to a truss should look like. This document should be provided to the home owner as proof the proper steps were followed to ensure the truss integrity.
Properly maintained, asbestos roofs can last a very long time, out living today’s composite roofs. While asbestos is a known health hazard, if it is not disintegrating and becoming airborne, asbestos slate roofs are not a hazard and can last up to 100 years. The attached article talks about asbestos roof maintenance.
A common problem found when conducting framing (pre-drywall) inspections is damaged engineered floor joists that are either missed or field repaired without proper documentation. Engineered floor joists, commonly referred to as TJI’s, have very specific guidelines as to what can and cannot be done. The most common issue we see is damage (cutting or drilling) of the top or bottom flange. Page 9 of this TJI manual addresses the issue. If damage of any type does occur, these joists must be evaluated by an engineer, who has the responsibility of determining what action if any is needed.