Coal tar is the more durable of the two bitumen products and is made using by products of coal production.
Roof type built up.
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.
Bur is suitable for most low slope roofing applications.
You can choose the number of layers or plies that are installed.
Let s discuss each type briefly.
Essentially modified bitumen is a traditional asphalt product which has undergone modifications which increase flexibility and enhance the built up roofing systems.
There are two main types of built up roofs and each is categorized by the binding agent or bitumen that is used.
Built up and modified systems.
There are 3 types of built up roofing which include.
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.
The concept been around for over 100 years although the.
Built up roofing types advantages and applications types of built up roofing.
Asphalt is less durable but often less expensive and is a by product of petroleum manufacturing.
Hot asphalt bitumen is the bonding and waterproofing agent between layers.
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.
These roof systems are commonly referred to as tar and gravel roofs.
The building code identifies the lowest pitched roof where shingles are allowed.
For over 100 years.
Metal roofs are generally known for their low maintenance aesthetic appeal and a finish that protects them from sun and water damage.
When it was first introduced people were confused about its durability.
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.
Built up roofing systems have a 120 year track record of success.
Built up roofing systems have been in use in the u s.
Gravel is an excellent fire retardant.
Once made of tar paper these types of roofs gradually are using more advanced materials such as fiberglass membranes.
This is one of the main reasons they have become such a stalwart in the roofing industry.
However after many years that finish may fade or deteriorate.
A ballasted roof is not adhered or anchored to the roof membrane in any way.
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.
Built up roofing is nothing new.
The built up roof technique is used for any roof that cannot be shingled because the pitch is too low.
