Roof Covering Defects

Poor designs found in pitched roofs inadequately sized members.

Roof covering defects.

Installing flat roof coverings be they felt asphalt or sheet metal is a specialised job. Damage as a result of making. Note or take photographs of. Diy felt jobs are the biggest culprit and are simply storing up problems for the future.

Damaged missing and slipped slates. This slate roofing photo series shows all kinds of roofing slate defects. Pitched roof coverings roof defects 1. Here we give photographs of slate roof conditions including normal wear on slate roofs worn out slate roofs types of slate roof wear and damage and stains or discoloration on slate roofs.

They occur when a gas usually water vapor is trapped within the roofing system either between the plies or between the plies and the insulation. Defects in pitched roofs normally caused by 3 main factors. Weak points can be created where services pass through the covering. Slate coverings to older roofs were secured with steel nails which are susceptible to corrosion known as nail rot or nail sickness.

Slate roof defect photo library. Check for poor cement pointing and in particular for damaged or missing lead or cement flashings. The perimeters are vulnerable even if the roof covering itself causes no problems. Using materials that are not intended for application on specific roof types can result in permanent damage to the roof.

Typically before 1890 nineteenth century roofs often contained narrow rafters. Example topics discussed in our building roofing articles include asphalt roof failures including thermal splitting and other defects causes and types of asphalt shingle roof leaks shingle blow offs and wind damage shingle cracks blisters stains thermal splitting and other damage fire retardant plywood roof sheathing defects. Some common causes of general roofing defects include. Blisters are the most common roofing problem.

Poor design damp penetration and failure of the roof covering which we sometimes see in out house surveys in london. People go up with caulking and plastic roof cement and improper materials that are in no way intended for that purpose harriman says. Many of the problems associated with felt coverings to flat roofs stem from poor workmanship. This is the most common roofing problem and it tends to get worse during the day when the heat of the sun causes the trapped moisture to expand.

Even small amounts of trapped moisture can result in your flat roof membrane detaching from the layer below and cause roof blisters. One of the most common problems we see with metal roofs is improper repair. Bubble like or long thin raised areas on the roof are called blisters. Damage can be caused by workers operating in the area.

Build up of moss.