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 Case
Study
Recoat an 11 year-old single ply EPDM
Rubber Roof with
EPDM Liquid
Rubber® |
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Project
Clarks Summit State
Hospital
Clarks Summit, Pennsylvania
DGS# A502-76.
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Owner
Commonwealth of Pennsylvania
Department of Welfare
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Project Description
Eleven single story buildings having
flat roofs covered with single ply EPDM rubber. The existing rubber was approx. 11 years old and original
10 year warranty had expired. Several buildings had leaks caused by seam failures but overall condition of the rubber
was good. Total roof area was 69,700 sq. feet with 11,000 lineal feet of seams.
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Scope of work performed
Replaced
approximately 500 sq. ft. of roof. Reinforced all seems with 6"or 9" Polyester fabric. Coated exposed ventilation ducts and vent pipes. Coated all existing rubber with a 30
mil average dry film of EPDM Liquid
Rubber®.
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Procedure |
- Clean roof using high pressure water
spray. (A dry cleaning method was used in areas with known
leaks). Remove water and let dry.
- All seams were reinforced with 6" or
9" polyester fabric.
- Applied thin layer of Surface Conditioner
F9910 to stabilize surface and improve bond of coating.
- Remaining surface was coated in
one application
by using a spreading rate
of 30 sq. ft. per gallon to ensure a 30 mil dry film thickness. Contractor elected to apply the coating
using squeegee and roller (rather than spray) because of wind conditions.
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Mixing in the Catalyst |
Polyester fabric reinforcing seam. |
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Applying Surface Conditioner |
Applying EPDM
Liquid Rubber |
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Flashing Around Roof Penetration |
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Special Note |
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Poorly adhered or non adhered areas of
the original rubber roof will experience swelling due to
solvent absorption. This swelling will result in wrinkles or bubble formation initially but will recover
as the solvent evaporates. Recovery is at least 95% for most rubbers and may take several weeks
depending on temperature. |
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Initial bubbling at expansion
joint. This condition
will recover.
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Completed roof sections two
weeks after application. Note small area of bubbling above shadow. This will recover completely.
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Advantages of
recoating aged single ply rubber with
EPDM Liquid Rubber®.
1) Repair leaking seams.
2) Liquid rubber is the same chemistry as the single ply substrate
so it will have the identical temperature / flexibility profile and is not thermoplastic.
3) Eliminates future seam failures.
4) Extends life of the roof.
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Completed Job |
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Warranty Coverage |
10 years by special arrangement |
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Quantity Of Liquid Rubber |
2,185 Gallons |
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Date Completed |
11/12/99 |
Contractor:
Budget Roofing Inc.
Shamokin,
PA.
Jim Searls, President
Marty Searls, Project Supervisor
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FOLLOW UP INSPECTION PHOTOGRAPHS
AFTER 8YRS., 4MOS. |
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These pictures show the overall color
and condition of the coating after 8 years in service |
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This
shows the dirt retention along the drain system that
runs along the center of the building
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 The
darker spots in this photo show where the material was not applied
thick enough, although there is not a failure at this point in time
(3/07) |
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CHECK BACK TO VIEW ADDITIONAL PHOTOS
THAT WILL BE ADDED LATER THIS SUMMER AFTER ANOTHER VISIT |
