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      Trace the opening of the bottom section of a rooftop dryer vent on the inside of the roof with a pencil, working from the attic. Climb on the roof and cut away any shingles still covering the hole, then spread roofing tar around the perimeter of the hole. Pull the shingles lining the part of the hole nearer the top of the roof up. Insert the pipe attached to the vent through the hole, work the vent flashing under the raised shingles, then let them fall onto the flashing. Allow the lower part of the flashing to rest on the shingles.Nail the vent flashing to the roof with 1-inch roofing nails, then cover the edges with more tar. Connect the vent cap. On most models, it just snaps on. Slip a 4-inch metal duct elbow onto the vent on the back of the dryer and secure it with a duct clamp. The elbow should be facing in the direction of the roof vent. Dryers venting through the roof need rigid metal ducting that extends straight to the roof exterior. Venting through the roof requires routine professional cleanings or risk lint build-up becoming a fire hazard.The code goes ahead to reiterate that the venting duct should be as straight as possible right from the start to the end. Turns and bends interrupt the flow of air and could become potential catchment areas for lint. It is common for households with slab foundations to vent their dryers through the roof.Though it is not popular with some contractors, builders, home inspectors, and vent cleaning technicians, this type of venting is becoming commonplace in modern-day construction.In the past, homeowners and venting system manufacturers were more focused on getting the job done. Several scenarios can make a roof venting system the ultimate choice;. Proximity to the neighboring homes is born out of urbanization; the more the people, the lesser space.Therefore, it has forced homeowners and contractors to make the best out of the available space. Most often, you will find that modern homes do not have the luxury of a separate private compound.Nowhere near a building entrance or ventilation, wall ventilation becomes a little bit complicated. The international code dictates that the venting duct terminates not less than three feet away from any direction. Concrete slab foundations are becoming the norm in building construction. When a dryer is along an interior wall in a concrete slab home, there is no access under the slab to run a dryer vent to the exterior. Directing a dryer to the roof becomes the only feasible option to vent the dryer outside.Dryers venting through the roof must have a rigid metal vent pipe and requires routine cleanings to prevent dryer fires. It would be best if you had the dryer vent professional cleanings annually or as needed. No one wants vents that are protruding out of a wall and attracting attention. Any homeowner considering beauty and visibility will most probably go for roof system dryer vents. As much as the International Housing Code recommends a 35 foot maximum in length, several scenarios can prove that the shorter the run, the better the outcome.From saving you the cost and hassle of a long run to complications in maintenance, shorter runs will save you your money. Longer runs require more energy. As heated moisture flows along a lengthy run, it may encounter friction and sometimes run into bends if there are any that act as speed bumps.As a result, the inside flow will be interrupted and need more energy to pick up speed. Straight shorter runs minimize the chances of lint build-up and dryer overheating, translating to lower chances of a dryer vent fire.Many small animals and reptiles live outside our homes and thrive on the grass and gardens in rural or urban settings. Birds also love to nest inside dryer vent pipes which can clog the vent and restrict airflow, causing your clothes not to dry correctly and increased fire risk. Length of run also reduces efficiency. The longer the run, the more friction loss is created which is why building code restricts total run length. Often, going straight up through the roof is the shortest route.While elbows and length-of-run are important factors for efficiency and safety, the exhaust termination is often the biggest restriction point. In real-world tests, inefficient roof terminations would often all but negate the improved efficiency of eliminating restrictive elbows. While it sometimes made sense to vent through the roof, every roof vent that had previously been used was inefficient often to a dangerous degree.  

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