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