Asphalt is less durable but often less expensive and is a by product of petroleum manufacturing.
Roof type built up.
Built up roofing systems have been in use in the u s.
This is one of the main reasons they have become such a stalwart in the roofing industry.
Essentially modified bitumen is a traditional asphalt product which has undergone modifications which increase flexibility and enhance the built up roofing systems.
The felts are reinforced with either glass fiber mats or organic mats ply sheets and when joined with the bitumen form a durable roofing membrane.
Built up roofing systems have a 120 year track record of success.
However after many years that finish may fade or deteriorate.
These roof systems are commonly referred to as tar and gravel roofs.
There are two main types of built up roofs and each is categorized by the binding agent or bitumen that is used.
Once made of tar paper these types of roofs gradually are using more advanced materials such as fiberglass membranes.
Built up roof bur the traditional hot tar and gravel roof is built from three or more plies of waterproof material alternated with hot tar and ballasted by a layer of smooth river stone.
Gravel is an excellent fire retardant.
Bur is suitable for most low slope roofing applications.
A traditional built up roofing bur system derives its name from the building of a roof on site using layers of base sheet interply sheets and cap sheet or other surfacing such as gravel or liquid coating.
When it was first introduced people were confused about its durability.
Built up systems are installed by alternating layers of asphalt or tar and supporting fabrics directly onto the roof.
A roofing type which has developed out of the built up systems is modified bitumen which we covered here.
Let s discuss each type briefly.
Popular in north america for more than 100 years built up roofing bur systems are composed of alternating layers of bitumen asphalt and fabrics called roofing felts.
The concept been around for over 100 years although the.
Built up roofing is basically a flat roofing technique and was the most popular form of roofing for flat roofs until the single ply roofing technique was developed and became popular.
The built up roof technique is used for any roof that cannot be shingled because the pitch is too low.
You can choose the number of layers or plies that are installed.
Built up roofing types advantages and applications types of built up roofing.
There are 3 types of built up roofing which include.
Then the building owner must decide whether to restore or replace their roof while there are some situations when replacement is necessary metal roof restoration may be more accessible than many people think.
The building code identifies the lowest pitched roof where shingles are allowed.
Hot asphalt bitumen is the bonding and waterproofing agent between layers.
Depending on the climate and the specific materials used built up roofing has an average.
Built up and modified systems.
Metal roofs are generally known for their low maintenance aesthetic appeal and a finish that protects them from sun and water damage.
Built up roofing is nothing new.
