Because gutters are located below or off the roof, people often neglect them when it comes to waterproofing a roof. However clogged or leaking gutters are a common cause of water infiltration. Undersized or clogged gutters let water flow back onto the roof. Most roof materials installed by Denver roofing companies are not designed to resist water coming up from the bottom. To ensure that you have the right gutter dimensions, you need to consult your Denver roofing companies on the average rainfall rate in the area. Large gutters may collect more debris though so consider gutter strips in wooded areas where you will get lots of falling leaves and branches.
If you have a metal roof, you might have rake trims. These are made to move along with the metal sheeting. It may seem like your roof is an immovable object, but it moves slightly in weather, heat and as the house settles. So it is important that gables and rakes are flexible enough to withstand this movement. Too much expansion and contraction lead to spaces for water to get in.
When inserting new penetrators, after flashing the most important aspect in waterproofing is using proper adhesives. Denver roofing companies do not use asphalt with metal because these materials do not bind well. There might be sized rubber jacks that can go around the penetration and eliminate the need for pitch. Sometimes the Denver roofer may have to construct additional supports to hold things like HVAC equipment.
End wall transitions where two different roof angles or types meet are common weak points when it comes to water. Just like in the edges, you need two pieces of flashing to make up for any roof movement. Occasionally the roofer will use non-metal flashing membranes in certain applications. They are supposed to be air tight as well as water tight.