Why do manufactured home roofs leak along the seams?
Seams are where separate sections of roof meet, and they are the joints that move most with heat, cold and wind. A seam that has lost its sealant gives water a direct path into the home.
Temperature swings expand and contract the roof sections and the sealant between them. Over time the sealant dries, cracks and pulls away from the edge of the seam, and rain or wind-driven water gets in behind it.
Because water follows the seam, the stain on the ceiling often runs in a long straight line rather than a round spot. That line is the clearest sign the seam is the source, and the technician follows it to the joint.
What does a practical repair on this kind of roof involve?
A practical repair usually means cleaning the old sealant out of a failed seam, resealing it, refastening loose trim and checking the vent flashing. The work is precise and stays within what the home's construction allows.
A typical job is a home with a stain running along one ceiling line and a lifted trim piece at the same edge. The technician removes the failed sealant, reseals the seam with a material suited to the covering, refastens the trim into sound material, and checks the vent flashing on the same side.
Each step is checked before the next one begins. If the framing under the trim is soft, the technician reports it, because a fastener set into soft wood will not hold through the next storm.
How can a homeowner tell a patch from a full re-cover?
A patch fixes a few failed joints on a roof that is otherwise sound. A full re-cover is considered when the failures are widespread and the framing underneath is no longer dependable.
If the stains come from one or two seams, the trim and the flashing look sound, and the ceiling below is dry, a patch is usually the answer. If stains appear in many rooms, the framing is soft in more than one place, or fasteners have backed out across the roof, the technician is more likely to recommend a re-cover.
Whether a re-cover needs a permit depends on the address and the scope of the work. The county or town inspections office confirms what applies to the property before work starts.
What moves the price of manufactured home roof work?
The price depends on the roof's size and pitch, the number of seams and penetrations, the condition of the framing, and access on the lot. It is explained and approved before work starts, and no figure is given on this page.
A roof with many sections and seams takes more time than a single simple run. Each vent, pipe and fan cap that has to be resealed adds detail work, and long trim runs take longer to refasten than short ones. Access on a rural lot, where a ladder is hard to set against an uneven ground, adds time as well.
Soft framing found during the work is priced as its own line, since it has to be fixed before the covering can hold. Whether the job is a patch or a re-cover changes the scope a great deal, and the technician sets both options out in writing.
How does the home's setup on the lot affect the roof?
Where the home sits and how the ground around it drains affects the roof edge and the wall below it. Water that runs back against the wall works its way into the same joints the roof is meant to protect.
Ground that slopes toward the home, or a gutter that dumps water at the foot of the wall, can keep the lower edge of the roof and the skirting damp. The technician notes these conditions as part of the report, because they shorten the life of the edge trim.
Drainage changes around the home are a separate matter from the roof work, and the homeowner decides on them. The technician can describe what the water is doing and what would help, without promising the result.