Roof Covering Defects

Note or take photographs of.

Roof covering defects.

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. One of the most common problems we see with metal roofs is improper repair. Damage as a result of making. Blisters are the most common roofing problem.

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. Flat roof defect 2 blistering. Installing flat roof coverings be they felt asphalt or sheet metal is a specialised job. Many of the problems associated with felt coverings to flat roofs stem from poor workmanship.

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. Slate roof defect photo library. Damage can be caused by workers operating in the area. Slate coverings to older roofs were secured with steel nails which are susceptible to corrosion known as nail rot or nail sickness.

This slate roofing photo series shows all kinds of roofing slate defects. Damaged missing and slipped slates. Build up of moss. The perimeters are vulnerable even if the roof covering itself causes no problems.

Some common causes of general roofing defects include. People go up with caulking and plastic roof cement and improper materials that are in no way intended for that purpose harriman says. Warm air rising from within a property reaches the underside of the roof covering cools and deposits moisture on the underside of the slates saturating the nail heads. Typically before 1890 nineteenth century roofs often contained narrow rafters.

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. Check for poor cement pointing and in particular for damaged or missing lead or cement flashings. Diy felt jobs are the biggest culprit and are simply storing up problems for the future. Defects in pitched roofs normally caused by 3 main factors.

Poor design damp penetration and failure of the roof covering which we sometimes see in out house surveys in london. Poor designs found in pitched roofs inadequately sized members. Bubble like or long thin raised areas on the roof are called blisters. Pitched roof coverings roof defects 1.

Even small amounts of trapped moisture can result in your flat roof membrane detaching from the layer below and cause roof blisters.