A roof blister is a pocket of air trapped between the layers of a roof membrane between the components of a roof assembly or within a layered roofing product such as an asphalt shingle.
Roof assembly blister.
Blistering only occurs in asphalt roof shingles as it is a byproduct of manufacturing or installation.
Blistering is an asphalt shingle roofing problem that is often mistaken for hail damage and is one of the most common issues residential roofing contractors are called to fix especially during the summer.
Blisters or blister rash can be identified by inconsistent bubbles rising up from inside the shingle.
What are blistering roof shingles.
The shingles are composed of different layers of material.
Multiple holes in a blistering roof will be easily visible from the street.
Removal and replacement of wet roof insulation will maintain r values improve energy efficiency extend roof life and prevent pre mature degradation of roof substrates.
Membrane systems are most susceptible to blistering because blisters are formed by voids between the plies or at the point between the substrate and the membrane.
Roof deck vapour retarder insulation and roof covering.
A continuous relatively inflexible roof assembly consisting of plies usually 3 or 4 of saturated felts or fabrics between which layers of bitumen asphalt pitch or modified rubberized asphalt is applied.
Flat roof blisters typically start as lamination voids within the system or product and grow larger due to the thermal expansion and.
The roof is usually surfaced with gravel to provide ultraviolet protection.
The roofing company co takes a look at what causes asphalt shingles to blister and what can be done to prevent it.
This area can fill up with air or water to form a blister which looks like a bubble on your roof.
A roof blister is a raised area where there is a loss of adhesion of the roof.
If left untreated a blister can grow larger and allow more moisture to get in so that the problem gets worse until more extensive repairs and possible replacement.
The horizontal dimension of a slope.
An additional option is to perform an infrared scan of the roof assembly.
The angle of a roof s surface.
An infrared roof inspection will help identify anomalies and areas of potentially trapped moisture.
While undergoing the lamination process.
In bituminous systems voids can be created by improper adhesion during application.
However it can be a problem if a blister is punctured as it will expose the layers underneath to water intrusion.
The sloped edge of a roof at or adjacent to the first or last rafter.
Causes of blisters all conventional low slope roof systems experience blisters in some form.
Generally roofing blisters are harmless and don t affect the waterproofing capabilities of the roof.
Replacing a section of your roof could help your home retain its value and beauty.
Large blisters can be a problem if they form near areas with high foot traffic.
