Soft spots are another name for weakened areas on your roof.
Soft spot on roof of house.
Over the period of manufacturer s designated roof lifetime of 25 to 30 years that plywood is exposed to heat in the summers heavy rains and the winter weather and cold dampness it brings.
Most roofs have plywood sheeting underneath the roofing tiles or shingles.
Your roof is supposed to be completely solid and not feel spongy or soft to the touch in any area.
That dip in the roof with a soft spot indicates that you should have your roof repaired asap.
If it was noticable walking on the roof i would be sure to check into it.
This can be a result of the plywood sheeting becoming wet from rain above or from moisture not being able to escape from below and leading to mold mildew growth on the wood.
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These soft spots usually form when the layer underneath gets soaked due to gaps in the shingles.
If you can tell there s a soft spot on your roof this most likely means that the substrate below the roofing material is damaged and deteriorating.
If there is inadequate ventilation the probability of moisture buildup and then mold mildew growth is much higher.
Could be a few things bad plywood bad framing etc.
Most roofs have plywood sheeting underneath the roofing tiles or shingles.
Soft spots don t go away they get worst.
The reason for these soft spots is that the layer underneath is probably very soaked due to gaps in the shingles cause over time and weather changes and the water is seeping through the sheeting.