HomeMy WebLinkAboutx4 Inspection Notes via Email 2018-12-18 From:
Sent:Tuesday, December 18, 2018 8:28 AM
To:
Subject: RE: Warranty on roof for Maplewood Water Treatment Plant
Thank your
At first look I was leaning towards a condensation problem. The attic space is not vented and the
skylight tunnels are not insulated (only at the ceiling level). See attached photo#0535. However upon
inspection,the attic space and insulation is dry, although there is some evidence of the up roof corners
of the skylight flashing (Pan flashing) leaking, Photo#0531.The back pans should have extended beyond
the corners farther than they do and the vertical part of the pan (the part that extends up under the
shingles), should have been flared out away from the corners so that water is running off of the edge of
the sheet metal rather than with or along that edge.After going up on the roof and inspecting from the
surface I noted that the shingles are "cupping", photos#0529 Ȓ. My concern with this is that we
could have "water troughing" which is when the water actually runs horizontally on the shingle rather
than fully shedding down the shingle in a vertical fashion. Water troughing is not good on a water
shedding roof system. We need to take a core sample of the roof to see what the felt underlayment
looks like. My guess would be that it is soaked and has probably degraded beyond its ability to perform
as designed.
My plan is to come back out with some new felt and new shingles and pull a core sample for inspection
and photo's to either eliminate or confirm this condition and go from there.
Elk Shingle Company was purchased some years ago by GAF and back at the time this roof was installed
they had a "troughing" problem. We have replaced a number of these roofs in recent years for this very
reason and found during the demolition phase that the felt paper and the plywood sheathing were
soaked from rain water.
I will let you know when we will be out to core this roof so that either you or-can be present to
observe and take your own pictures.