Depression between the rafters.
May lead to delamination of the roof sheathing.
3 8 plywood roof sheathing.
A boot that relies on a snug rubber seal and all metal flashing with soft lead that can be bent over and into the pipe.
But probably not due to the amount of delamination.
I had my roof sheathing replaced a year ago.
Particularly on the roof.
This winter i went up.
When delamination is extensive the sheet products lose their structural integrity resulting in a spongy subfloor weak roof sheathing or bulging exterior siding.
Between the years of around 1964 to 1975 homes being built saw the installation of what was first generation fire retardant plywood.
Some versions are made completely from lead.
Mostly in the mid 70 s that i have seen that.
I have seen this type of delamination and was caused by a bad batch of plywood or defective from the manufacturer.
If fasteners pull through the sheathing the entire roof covering and sheathing becomes loose and may be blown off during high winds.
They both attack the roof s surface and if left to fester both make a roof system more susceptible to wind and water damage.
Know the differences and protect your roof blisters and delaminations aren t the same issue but they have similar symptoms and cause similar problems.
Roof blisters and delamination.
You are saying this was a 1964 build.
There are two kinds of flashing used to seal vents.
And like any other roof penetration that sometimes means trouble.
Others are galvanized steel with a lead collar.
De lamination of the roof sheathing may cause.
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.
It may be mfgr.
This looks like an earlier build.
Defects in those sheets or it could be that the ventilation was blocked only at those sheets.
Buckling can weaken the roof by separating the sheathing from the rafters or trusses.
Larry roof trusses were invented in 1952 and late 60 s before national use.
This may be indicative of what.
Check the plywood sheathing particularly at the panel edges for evidence of delamination.
In determining if it is.
Roof decking plywood delamination if you have a home twenty five years or older you may want to consider the condition of the plywood.
The contractor thought it might have been due to excess moisture in the attic.
What is the spacing requirements between the insulation and the roof deck sheathing at the location of the vent.
Delamination may also occur in cabinets and other furniture products that are made from finish grade laminated wood.
