May Lead To Delamination Of The Roof Sheathing

Depression between the rafters.

May lead to delamination of the roof sheathing.

Every re roof requires a close inspection of the substrate. High moisture levels break down the glue in the plywood and allow the plies to delaminate. If the environment is humid moisture can get trapped between the membrane and insulation. The worst cases result in patches of rot.

Roof decking plywood delamination if you have a home twenty five years or older you may want to consider the condition of the plywood. Panel type roof sheathing may lift off the rafters in a regular pattern. This is sometimes accompanied by buckling. Delaminations commonly affect single ply and fully adhered roofs.

When the membrane and insulation separate. Leaks around deteriorated flashing are the most common. The contractor thought it might have been due to excess moisture in the attic. Like blisters delamination can come from improper installation in inclement weather.

This may be indicative of what. The attic was vented by soffit and a ridge vents. This winter i went up. That being said what the home inspector saw may or may not be mold.

The horizontal board enclosing the ends of the rafter projections or tails is normally referred to as the board. It may be mfgr. De lamination of the roof sheathing may cause. The soffits didn t appear to be congested with insulation however the ridge vent had a filter in place.

What is the spacing requirements between the insulation and the roof deck sheathing at the location of the vent. What might delamination of the roof sheathing lead to. In determining if it is. Between the years of around 1964 to 1975 homes being built saw the installation of what was first generation fire retardant plywood.

Incidental roof leaks particularly ones that go unnoticed can delaminate plywood sheathing or cause osb to swell. But probably not due to the amount of delamination. First deal with the cause which is inadequate attic ventilation. If this is the case the solution is twofold.

I had my roof sheathing replaced a year ago. To improve it make sure your home has continuous ridge and soffit ventilation. In the future looking for a date stamp on the affected sheet or other sheets in the same general area may help an apa rep. Defects in those sheets or it could be that the ventilation was blocked only at those sheets.

3 8 plywood roof sheathing. It was plywood and had delaminated. Particularly on the roof.