Both residential and commercial structures can benefit from the protection provided by bituminous waterproofing systems.
Bitumen, also known as asphalt or coal-tar pitch, is a material that is a mixture of organic liquids that are extremely sticky, viscous, and waterproof.
Bitumen is also known as a pitch.
In the construction of roofs, these technologies are occasionally utilized, and the resulting goods take the shape of roofing felt or roll roofing.
The foundation material that is utilized in the production of roof shingles and roll roofing is roofing felt, which is comparable to tar paper.
These bitumen compositional membranes have been used for decades as waterproof coverings in residential and commercial roofing, and they consist of two layers total.
The initial layer of the bottom is a solid backdrop made of a polymer membrane, which is frequently supplemented with glass fibers.
The self-protective top layer is composed of mineral grains, and a bituminous mixture serves to encase both of these layers in its whole.
Felt paper is typically used as an underlayment (sarking) beneath other construction materials, most notably roofing and siding materials, and it is one form of the membrane that is utilized in asphalt built-up roofing (BUR) systems.
Other typical applications for felt paper include the following: It is needed for roofs that need to fulfill Underwriters Laboratory (UL) fire ratings for the roof deck to be protected during the building process by the quick application of roofing underlay up until the point at which the roofing material is applied.
In re-roofing applications, the separation of the roof covering from the roof deck protects the roof covering from the resins that are present in some sheathing materials.
Additionally, the separation cushions unevenness caused by old nails and splinters.
An ordinary leak, a leak caused by wind-driven rain or snow, wind damage to the roof covering, or ice dams can all cause the roof covering to get penetrated by water, but the underlayment will prevent this from happening.
However, the installation of underlays can raise the temperature of the roof, which is the primary factor in the accelerated aging of asphalt shingles.
Additionally, felt paper can wrinkle when it gets wet, which can cause asphalt shingles to become visibly damaged.
If an underlay is not installed, the guarantee on the roof covering might be voided.
Felt paper comes in a variety of grades, the most popular of which are Type 1, also known as 15-pound (15#) or No. 15 (#15), and Type 2, also known as 30-pound (30#) or No. 30 (#30).
