Mineral Felt Flat Roof Defects

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Mineral felt flat roof defects.

Introduction to independent surveyors. Flat roof defect 1 standing water this is one of the primary causes of flat roof leakages. Water will start to damage your roof s material if it does not drain or evaporate within 72 hours and that means regular inspection is particularly important during winter and spring months. When the water evaporates in to a gas and expands it cannot escape and so forces the layer of felt above up to form a blister.

Movement of the covering or the underlying deck to which it is fixed. After time this may cause a split in the felt. Common defects of built up mineral felt blistering this is when there is expansion of trapped air underneath the covering which will expand and contract as it is heated by the sun. These roof coverings are generally designed to be laid flat and are prone to weakness where they are bent.

Bituminous felt is a form of waterproof sheeting that is used to cover flat roofs or as an underlay beneath slate or tile roofing. This video shows a typical flat roof replacement carried out by argyle roofing based in london uk. Metal such as lead or copper. The substance itself is made from bitumen which comes from the distillation of crude oil that has been either mixed with sand or crushed limestone.

Flat roofs problems improvements and insulation. Beginning with the removal of the old roofing felt this. This is a defect that affects built up felt roofs. Similarly if materials are not carefully selected or wrong materials are put together such as in the instance of zinc and lead abutting both of which are common roofing materials then corrosion or other defects can occur.

For example at skirtings parapets and verges and at joints or seams.