Case Study: Slipping tiles and noise pollution
Foamroof repair damaged and slipping tiles combined with sprayfoam reduce noise pollution from aircraft flying near Bournemouth Airport.
Mr Preston’s bungalow is located on the outskirts of Bournemouth and has been in the family since almost new in 1960. It’s a well built, recently refurbished property. The existing loft space was used extensively for storage.
Mr Preston saw our display stand at B&Q in Poole and felt that the Foamroof Sprayfoam would be a good idea to stop slipping tiles and reduce the noise pollution of aircraft flying over to Bournemouth Airport.
The first step in the Foamroof process is to complete a visual survey. The purpose of this is to comprehensively identify existing issues and potential issues with the roof. Mr Preston’s roof has small clay tiles dating back to 1955. The initial survey identified approximately 20 tiles that were delaminating.
Delamination (or spalling) of clay tiles is caused by water becoming trapped between the tiles and over time soaks into the tile. In winter this water alternately freezes and expands and eventually splits the surface away from the body of the tile. This process does take many years but eventually leads to the total failure of the tile and a leaky roof.
This problem is particularly prevalent in rooves built during the 1930’s / 40’s as mass produced tiles were introduced that were machine made to be very flat which had the unintended consequence of trapping more water by capillary action. Modern tiles are made slightly curved to avoid this capillary action and extend the life of the tile. Tiles can be either single cambered (curved along the length) or double cambered (curved along the length and width).
Tiles older than 1930 were generally handmade and therefore naturally uneven so they tend to be more restistant to spalling.
The visual survey also highlighted missing pointing at the ridge. This is typically caused by the weather, eventually the wind driven rain washes the sand and cement mix out. Once the joint is compromised water ingress into the roof can easily occur potentially causing further issues.
Mr Preston also wanted a Velux roof window installed to provide additional light into the loft space. We only use Velux and typically install the 980×780 sized centre pivot window as these represent excellent value for money.
During the visual survey we also complete a Risk Assessment to highlight any safety issues for the roofing and spray teams. We also take numerous internal and external photos to provide us with a better understanding of the entire project. A drawing and measurements complete the visual inspection stage.
The next stage was for the roofing team to complete the works identified during the initial survey and to complete an on-roof survey. We check the overlap of the tiles and look for any potential areas that could cause water ingress. Once the roof was completely prepared and the window fitted we could start the internal works.
We started by covering the items in the loft (racking bolted to the floor), taped up the rafters, covered the loft floor and then applied our BBA (British Board of Agrement) approved Sprayfoam.
When we asked about the effects of reducing the noise of the planes, Mr Preston said “ we haven’t noticed any planes!” so it’s working well. With no water ingress, a warm loft space and a roof guaranteed for 10 years, Mr Preston is delighted and keen to recommend Foamroof.