Use your string line to determine how much the roof need to go up.
Roof dipping in center.
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If you can see a dip curve or swag on the peak when standing in the street your roof has a problem.
A dip or sag in your roof what caused it.
It often occurs next to a roof penetration such as a chimney or dormer or at the edge of the roof as in the photo above and is easily verified by checking the area in the attic.
It might be something.
If your rafters are still sagging a bit and it is causing your roof to dish out a little in the center of the roof sides add a 2x4 that goes all the way across the rafters in the center of the length of the rafters.
Here s four common causes.
The first thing to fixing a sagging roof is to find what is causing it to sag.
A sunken or buckled area in the roof is most easily visible when looking up the slope of the roof from the ground.
Roof leak leakage of the roofing that has caused rot and partial collapse of the sheathing in the area of the leak is the 1 cause of a roof dip.
If the damage is confined to the decking you may see low spots in the roof plane.
Whether the roof is constructed with conventional rafters or trusses these dips are usually caused by sagging fly rafters added to make the overhang.
However with some severe cases a damaged or sinking foundation is the cause of the problem.
They are most noticeable on older homes with.
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Water that has penetrated beneath your roof covering can rot the decking as well as the wood in your trusses rafters and other structural supports.
This article describes explains the directions of forces in roof structures illustrating downwards force horizontal thrust and the causes of rafter sags rafters that disconnect from the ridge or top plate and why a sagging roof pushes the building walls outwards at the wall top.
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In most cases it is caused by a damaged rafter or roof decking.
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We include photographs of collapsing wood framed roofs and photo sequences.
Roof sag or roof collapse forces.
What causes a sagging roof line.
You need to go into your attic and inspect the roof in order to discover the cause.