May Lead To Delamination Of The Roof Sheathing

The attic was vented by soffit and a ridge vents.

May lead to delamination of the roof sheathing.

Defects in those sheets or it could be that the ventilation was blocked only at those sheets. In the attic the roof sheathing appears to be delaminating and some staining was observed. It may be mfgr. Delaminations commonly affect single ply and fully adhered roofs.

One of the implications of high moisture levels from either condensation or leakage is delamination of plywood sheathing. What might delamination of the roof sheathing lead to. Incidental roof leaks particularly ones that go unnoticed can delaminate plywood sheathing or cause osb to swell. The contractor thought it might have been due to excess moisture in the attic.

Roof decking plywood delamination if you have a home twenty five years or older you may want to consider the condition of the plywood. High moisture levels break down the glue in the plywood and allow the plies to delaminate. This is sometimes accompanied by buckling. When the membrane and insulation separate.

But probably not due to the amount of delamination. First deal with the cause which is inadequate attic ventilation. To improve it make sure your home has continuous ridge and soffit ventilation. It more likely may be the early stages of decay and delamination of the roof sheathing.

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. If the environment is humid moisture can get trapped between the membrane and insulation. This winter i went up. Like blisters delamination can come from improper installation in inclement weather.

It was plywood and had delaminated. 3 8 plywood roof sheathing. Leaks around deteriorated flashing are the most common. I had my roof sheathing replaced a year ago.

This may be indicative of what. If this is the case the solution is twofold. Panel type roof sheathing may lift off the rafters in a regular pattern. The worst cases result in patches of rot.

What is the spacing requirements between the insulation and the roof deck sheathing at the location of the vent. The horizontal board enclosing the ends of the rafter projections or tails is normally referred to as the board. Between the years of around 1964 to 1975 homes being built saw the installation of what was first generation fire retardant plywood. Particularly on the roof.

The soffits didn t appear to be congested with insulation however the ridge vent had a filter in place. In determining if it is. De lamination of the roof sheathing may cause.