Winery - Osoyoos,
BC
July, 2004
The metal roof of a two year old winery building has been leaking
during rainfall. The interior side is finished off with maple paneling in
the sampling area. Access here is not possible, making it difficult to see
where the water is getting in. Water drips in spots at the metal beams, where
the base of the metal roof "barrel" meets the flat tar & gravel
over Q-decking. It has been determined that the flat roof is sound, with no
apparent defects or cause for leaking.
Some bolts were loose and at least one was missing
altogether (see below left).
Corrosion evident on the exposed panel edges (see below right)
Potential problem areas identified
are: loose or missing nuts/bolts, defective washers, seams, flashing's, ponding
water and heat expansion. Polyurethane caulking on bolt heads and bottom base
plate seams (below) did not resolve the issue, although caulking did not cover
all bolt heads or seams. Temperatures in the Osoyoos area can climb to 40
degrees C or more. This places considerable heat load on metal roofs, especially
where the substrate has been insulated on the underside and closed in, offering
little to no ventilation. During the application below, it was impossible
for one to hold their hand onto the metal substrate, with ambient temperatures
reaching 40.5 C.
EAGLE recommended a unique monolithic coating system, which would address all of the potential problem areas:
| - Caulking of all of the seams and bolts with SUPER BASE HS ® to ensure a waterproof substrate that is resistant to UV and ponding water. |
| - A base coat SUNSHIELD 2000 ® would be applied over the total surface area to insulate and prevent further heat expansion of the substrate. Added benefits would include a flexible coating, which provides additional waterproofing over the complete substrate |
| - A top coat of ENAMO GRIP ® tinted as per customer who wished to maintain the aluminum appearance as much as possible. Added benefits include an outstanding low maintenance protective coating, which provides semi-gloss retention, color retention, chalk resistance, water resistance and UV resistance. The corrosion on the panel edges will no longer be able to spread once it is permanently sealed under this coating system. |
Preparation of the substrate involved water blasting
the roof clean of all loose debris and dirt (common in this wind blown area) Note
the water ponding at the base (lower right photo). This flashing does not slope
away from the seams. These areas had to be hand dried to ensure the substrate
was completely dried to accept the coating system.
SUPER
BASE HS ® applied on all bolts and seams at 30SqFt p/gal. The bottom
base flashing was applied liberally with added material to accommodate the anticipated
ponding water.
SUNSHIELD
2000 ® applied at 16mil WFT to dry
down to 7.38mil DFT
Top
Coat - ENAMO
GRIP ®
