If the line does not continually follow the bottom of the beam and the bottom of the beam is below the line the beam is sagging. If rain and snow are able to penetrate sections of your roof it can lead to rot.
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Problems may also occur if the beam or strut is the wrong size or defective with cracks or splits.
Why is my garage roof sagging. Jan 16 2019 Cracked rafters and trusses can cause sagging. Jun 13 2018 This is the most common cause of sagging sheathing and will usually be limited to the area around the leak while poor attic ventilationthe second most likely reasoncan cause the problem over a larger swath of the roof. Common flaws include undersized.
Spacing of ceiling joists or trusses If the ceiling joists or trusses supporting the ceiling drywall are spaced too far apart then sagging may result and the stress from this may create cracks. Feb 27 2016 In my experience the primary reason for a sagging ridge is an inadequate rafter to wall to joist connection either the wrong number or type of nails. Jul 10 2018 Long-term high moisture is the cause of most sagging garage ceilings we have seen over the years.
In this case you need to pull off the fascia all around and let the roof edge drop to an acceptable hgt. Check the ceiling for sagging by attaching a string on one end of the beam and run it along the bottom edge of the beam. Dec 21 2017 Sagging or low spots in a flat roof may be due to undersized or weakened roof joists or problems with the buildup layers beneath the exposed roofing.
If your roofs structure is unsound because of leaks or termite damage you may start to see bowing in your roof. Occasionally a house wasnt engineered properly for the type of roof that has been applied. Jul 19 2004 Orrrr the problem is that when the roof was changed from shakes to modern shingles the roofers removed the horizontals or I call them screeds leaving a height deficit which was ignored.
Dec 17 2018 If the beam is not properly nailed it can also pull loose and this contributes to roof sagging. Weight-related sagging can also be caused by design flaws that leave the roof unable to support its own weight. Over time exposure to moisture can begin to degrade the materials that compose your roof.
If the sag is between load-bearing walls. May 27 2020 The most likely causes of a sagging roof include the following. Diffe ways to jack up a sagging roof mycoffeepot org jacking up the roof part 1 how to support sagging or jacking up the roof part 1 how to support sagging or quick fix bracing a sagging garage beam you diy ilizing a sagging roof building trusses joists diffe ways to jack up a sagging roof mycoffeepot org.
If you go to the trouble to jack up the ridge make sure your ceiling joist is properly connected to the rafter and wall else your ridge will settle back down as soon as you release the jack. If the sag is over a load-bearing wall then you need a structural engineer to have a look just in case the problem is with the foundations or the wall. Yes sometimes the sag is because the homeowner stacked boxes directly on the drywall in the attic or accidentally stepped off the bottom truss chord when moving around up there but usually it is just high moisture.
The first step is to the basement first. Reason 1 Weak Roofing Material.
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