Mounting exhaust wrap is usually done on exhaust details such as manifolds and exhaust pipes for cars, motorcycles, ATVs and more to counteract radiant heat and keep the temperature in the engine compartment down. Radiant heat is, in addition to age, one of the biggest reasons why hoses and wiring become bad. A manifold that does not have any kind of heat protection raises the temperature in the engine compartment and nearby components and makes service of engine related parts unbearable or impossible due to the high heat even some time after the engine is switched off.
An exhaust wrap solves all these problems and gives a nice look.
The material in the exhaust wrap is usually based on fiberglass fabric, which in turn has a lot of variations, and depending on quality, the fabric is also treated in different ways and at different stages of manufacture. It is these two points that determine how good quality the exhaust wrap gets.
Mounting can be done both dry and wet, but usually a soaked exhaust wrap is easier to mount because you can stretch it out a little more so that it get a tighter fit. At the first start up / heating of the exhaust wrap, it smokes a little and it works a bit like applying a plaster. The fibers in the wrap "solidify" and stay in place well but cannot be disassebled without breaking.
Consumption of exhaust wrap can easily be calculated if you know what to wrap and you have a clear idea of how. Otherwise, there are so many factors that come into play to get a sensible result such as overlap, bends, stretch, withdrawals, etc. A roll of 10-15 meters is often enough for a "normal" downpipe / exhaust manifold. The rule of thumb is to use 25mm width for exhaust manifolds and 50mm for exhaust systems or to put it another way, 25mm where sharp bends occur and 50mm on straight pipes or with long radius bends.
Stainless steel cable ties
Stainless steel cable ties are used when mounting the exhaust wrap. There are two known types of cable ties in steel and they are stepless cable ties and cable ties with click function. These cable ties are available in different lengths and widths.
The stepless cable ties work just as it sounds, they are tightened steplessly and pinched when tightened.
The stainless steel cable ties with click function are very easy to mount and have about 1mm between each step / click so it is almost "stepless".
Which cable tie you choose has no major significance but is a matter of taste
When attaching an exhaust wrap with stainless steel cable ties, you start by wrapping and then squeezed together with a cable tie. This is wrapped over and then clamped at the end of the winding. The last cable tie will be visible. If it is a long distance to be wrapped or if there are very tight bends, several stainless steel cable ties can be used to advantage as this only gives a better end result and the exhaust wrap is held in place better.
Wrap exhaust manifold
Exhaust wrap are usually wrapped on manifolds and so called racing manifolds where the manifold is not cast but is made up of pipe parts. It is usually made up of shorrt radius bends so a 25mm (1") exhaust wrap is easier to work with and get a good end result than using a 50mm (2") wrap. In the first place, it is radiant heat from the manifold that you want to get rid of as this heats up the entire engine compartment and can also damage nearby parts such as hoses from turbo and cabling that are routed nearby.
Wrap exhaust systems with exhaust wrap are made for the same reason as manifolds when you want to lower the temperature in the engine compartment and prevent radiant heat from becoming obsolete and damaging nearby hoses and cabling. When wrapping a downpipe, a 50mm (2") exhaust wrap is usually used as there are usually long radius bends and a wider wrap provides a more durable assembly as there are fewer wound turns on the same distance in comparison with a narrower exhaust wrap.