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Question DetailsAsked on 7/13/2014

lint coming out of dryer vent stick to roof

Would a larger vent help?

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No - it is passing the lint fine, as evidenced by it making it to the roof. A larger duct would reduce air velocity, so less lint would make it through the duct - and if it makes it into the duct, you want it to make it on through if possible. You do not say how much lint - little bits and pieces accumulating, like maybe the equivalent of a square of toilet paper worth every week or so, would be normal and can just be hosed off if you desire. This is one reason people do not like dryer vents through the roof. If you are getting a lot of lint, or flattish pieces rather than just fibers and hair and such, then go to the next paragraph.
What you need is to do is first check your lint screen in the dryer is fully inserted and has no tears or holes and is working right, then if that is OK probably get your duct cleaned. If lint screen is good and you are getting significant lint coming out the duct it probably has built up a thick enough lint layer (bit by bit with each load) that it is flaking off and now blowing out the vent hood on the roof. This may take a bit of thinking to understand - initially, with each load lint is going up the duct to the roof, but is moist - so much of it sticks to the inside of the duct because of the mosture, making a lining sort of like a spitwad or hornets nest, to put it bluntly. This keeps building up over time until it gets thick enough it starts restricting airflow or starts getting heavy enough to collapse. When the opening in the duct gets restricted enough, the velocity goes up (but airflow thorugh the dryer also drops) so instead of it sticking in the vent it starts coming out the top - which might be what is happening in your case. Also, as it thickens up, it can start collapsing off the wall during drying, with larger pieces falling down to the dryer end and lighter material blowing out the duct. Also, with roof ducting rather than horizontal, it has to lift the moist lint up the duct against gravity, so there is a lot more tendency to stiocking in the duct or matting in the bottom of the vertical run, whereas in horizontal runs it tends to keep moving and goes out the duct freely.One other thing to check - is your dryer drying completely and hot enough - should be too hot to comfortably touch (but not burning hot) right at end of drying cycle (usually about 150-180 degrees on hottest cycle - usually Norma/Permanent Press setting). You can check temperature by taking an oven or candy thermometer and sticking it in the middle of the clothes for a minute immediately after the dryer shuts off. Do NOT try running it around with the clothes in the cycle. If it is running cold because of faulty temperature sensors or failing heating element then the air coming out will not be removing the moisture from the lint as well, so it will stick to the duct and to the roof more than if it was hotter and totally dry.

Answered 6 years ago by LCD




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