What is the SBS modified bitumen?
SBS (styrene-butadiene-styrene) is a synthetic thermoplastic rubber. SBS modified bitumens first appeared in early 70s.
How much SBS is in an SBS modified roofing?
In a standard SBS modified bitumens, there is 8 - 22 per cent of SBS.
Advantages of an SBS bitumen roofing
- Can be laid and welded at low temperatures;
- The whole back of the roll can be made adhesive;
- Hot air welding allowed, no flame necessary;
- Compatible with oxidized asphalts so both can be combined (even though I wouldnīt recmmend it);
- Asphalt modified with SBS is elastic - therefore this kind o...
What is the APP modified bitumen?
APP stands for
atactic (or amorphous) polypropylene. First produced in 1960s using a modifier that was a sideproduct of isotactic propylene production, later manufactured directly as an atactic polypropylene for asphalt membranes.
How does APP influence the bitumen features?
APP improves durability of the bitumen roofing membrane at standard temperatures but practically doesnīt influence its properties at temperatures below 0 degrees C, therefore also polyolefins are added to the compound (polyalpha-olefins, ethylene-propylene-butene which improve the under-zero durability.
How much APP is in the APP ...
For sure, the connection point where the asphalt shingles meet the gutter system belongs to the most problematic parts of any roof shingled with asphalt shingles.
These connection points must be treated with either bituminous or silicon
glues.
Bituminous glues and coatings
The bituminous or asphalt glues are great but they are not very stable if exposed to the ultraviolet radiation for longer time.
If the bituminous glues or coatings must be used on the visible areas (where they have to face the UV radiaton) they must be covered with the sand or mineral granulate.
The overlay of the asphalt roofing over the gutter line must be at least 10...
