The document summarizes repairs made to the built-up asphalt roof of a church building. The repairs included vacuuming existing gravel, repairing ridges, blisters and splits in the membrane, and replacing deteriorated flashings. A cold-applied rubberized restoration treatment was installed over the roof membrane. New gravel was embedded into the restoration material. After four years, the restored roof showed no signs of problems and was expected to extend the life of the roof by 20 years.

1. Cold Process Restoration of Built-up
Built-up
Roof on Church
completed in 2009

2. Satellite view of built-up asphalt roof with gravel surfacing.
Satellite view of built-up asphalt roof with gravel surfacing.

3. Dry and Wet Vacuuming of existing gravel.
Dry and Wet Vacuuming of existing gravel.

4. Flashings prior to being replaced
Flashings prior to being replaced
Perimeter Flashing Deterioration: Expansion and contraction
movement of the roof causes stress in the perimeter flashing
causing it to tear. Moisture can then enter the roofing system
and building. Moisture entry will cause damage to the
insulation and reduce its insulating properties. It will also allow
water to enter the building causing internal damage.

5. All deficiencies were identified and repaired prior to
the new flood and gravel installation
Ridges: these show up on the surface of built up roofs as linear buckling felt lines protruding upward through the surface layers of
asphalt and aggregate. Ridges are formed by either thermal changes expanding and contracting the roofing felts or by gaps in the
underlying insulation that allow vapour to migrate upwards through the roof system. Over a period of time ridges will grow and
erode until they are stripped of their protective asphalt. These exposed ridges, through repeated weather cycling, will eventually
crack and split to allow water into the roof system.
Splits: membrane splits are usually caused by building movement, ridges, and expansion and contraction. Such movement can be
caused by lack of attachment of one or more of the component parts of the roof system, or where the building itself generates
movement. Weak or inflexible membranes reach a point where they cannot accommodate further movement. At this time the roof
splits open. The open split allows water to enter the roofing system, saturating the insulation, and causes leaks into the building. If
allowed to persist, the area of damage will expand.
All ridges
repaired prior
to restoration

6. Blister Repair
Blister Repair
• Spud all gravel back twelve (12) inches around the blister, clean and prime the area.
• All blisters must be cut and opened down to the solidly adhered plies of the existing
roof system. Use a roofer's knife to open the blister with an "X" or "H" cut. Fold the
flaps and remove any existing moisture. Permit the area to dry before applying repair
materials.
• Apply a liberal coating of bituminous material into the blister. Firmly press the flaps
into the bituminous material and trim the edges to ensure proper fit.
• Apply a coating of bituminous material over the repaired area extending a minimum
of eight (8) inches beyond the cuts. Embed a strip of fabric into the bituminous
material and brush or roll firmly. Apply a second coat of bituminous material over the
fabric and onto the roof surface.

7. Cold Applied Restoration
Cold Applied Restoration
Cold applied no odor rubberized restoration treatment installed to add waterproofing strength
Cold applied no odor rubberized restoration treatment installed to add waterproofing strength
to the field of the roof.
to the field of the roof.
V.O.C. Compliant
- Environmentally Friendly
- Low odor
- Applied by spray, brush, or squeegee
- Resists degradation due to UV exposure
- Low solvent released into atmosphere
- Provides a superior surfacing for all cold process restorations

8. Embed pea gravel to cover all resaturant. No resaturant is to be visible
Embed pea gravel to cover all resaturant. No resaturant is to be visible
throughout. Uniformly embed aggregate in the flood coat of cold
throughout. Uniformly embed aggregate in the flood coat of cold
adhesive at a rate of five hundred (500) lbs. per square.
adhesive at a rate of five hundred (500) lbs. per square.

9. Gravel being installed to protect the roof from ultraviolet rays.
Gravel being installed to protect the roof from ultraviolet rays.

11. Flashings are replaced due to the extreme pressure that exists
Flashings are replaced due to the extreme pressure that exists
from expansion and contraction of building.
from expansion and contraction of building.
Base Flashing Ply:
Base Flashing Ply:
–
– Base Flashing Ply: 40 mil SBS modified
Base Flashing Ply: 40 mil SBS modified
membrane with woven fiberglass scrim
membrane with woven fiberglass scrim
reinforcement with the following minimum
reinforcement with the following minimum
performance requirements according to ASTM
performance requirements according to ASTM
D5147. Properties (Finished Membrane):
D5147. Properties (Finished Membrane):
Modified Flashing Ply:
Modified Flashing Ply:
Modified Membrane Properties (Finished Membranes):
Modified Membrane Properties (Finished Membranes):
STRESSPLY "E"; ASTM D6162, Type III Grade S
STRESSPLY "E"; ASTM D6162, Type III Grade S
Tensile Strength (ASTM D5147)
Tensile Strength (ASTM D5147)
•• 2 in/min. @ 73.4 ± 3.6°F MD 500 lbf/in CMD
F
2 in/min. @ 73.4 ± 3.6° MD 500 lbf/in CMD
550 lbf/in
550 lbf/in
•• 50 mm/min. @ 23 ± 3°C MD 87.5 kN/m
C
50 mm/min. @ 23 ± 3° MD 87.5 kN/m
CMD96.2 kN/m
CMD96.2 kN/m
–
– Tear Strength (ASTM D5147)
Tear Strength (ASTM D5147)
•• 2 in/min. @ 73.4 ± 3.6°F MD 900 lbf CMD 950
F
2 in/min. @ 73.4 ± 3.6° MD 900 lbf CMD 950
lbf
lbf
•• 50 mm/min. @ 23 ± 3°C MD 4003 N CMD 4226
C
50 mm/min. @ 23 ± 3° MD 4003 N CMD 4226
NN
–
– Elongation at Maximum Tensile (ASTM D5147)
Elongation at Maximum Tensile (ASTM D5147)
•• 2 in/min. @ 73.4 ± 3.6°F MD 6.0% CMD 6.0%
F
2 in/min. @ 73.4 ± 3.6° MD 6.0% CMD 6.0%
•• 50 mm/min. @ 23 ± 3°C MD 6.0% CMD 6.0%
C
50 mm/min. @ 23 ± 3° MD 6.0% CMD 6.0%
–
– Low Temperature Flexibility (ASTM D5147):
Low Temperature Flexibility (ASTM D5147):
Passes -30°F (-34°C)
F
Passes -30° (-34° C)

12. Aluminize any exposed roof and projections. This prevents
Aluminize any exposed roof and projections. This prevents
elements like UV from deteriorating any penetrations which may
elements like UV from deteriorating any penetrations which may
lead to early roof failure.
lead to early roof failure.

13. New metal counter flashing installed to protect
New metal counter flashing installed to protect
waterproofing membrane.
waterproofing membrane.

14. Lower level roof
Lower level roof
After four years the roof has zero signs of problems and the
After four years the roof has zero signs of problems and the
restoration is expected to add 20 years to the existing roof.
restoration is expected to add 20 years to the existing roof.

15. Upper level roof
Upper level roof
FINAL INSPECTION
FINAL INSPECTION
•• At completion of roofing installation and associated work, meet with Contractor, roofing system
At completion of roofing installation and associated work, meet with Contractor, roofing system
manufacturer's representative, and other representatives directly concerned with performance of roofing
manufacturer's representative, and other representatives directly concerned with performance of roofing
system.
system.
•• Walk roof surface areas of the building, inspect perimeter building edges as well as flashing of roof
Walk roof surface areas of the building, inspect perimeter building edges as well as flashing of roof
penetrations, walls, curbs and other equipment. List all items requiring correction or completion and furnish
penetrations, walls, curbs and other equipment. List all items requiring correction or completion and furnish
copy of list to each party in attendance.
copy of list to each party in attendance.
•• The roofing system manufacturer reserves the right to request a thermographic scan of the roof during
The roofing system manufacturer reserves the right to request a thermographic scan of the roof during
final inspection to determine if any damp or wet materials have been installed. The thermographic scan
final inspection to determine if any damp or wet materials have been installed. The thermographic scan
shall be provided by the Contractor.
shall be provided by the Contractor.
•• If core cuts verify the presence of damp or wet materials, the Contractor shall be required to replace the
If core cuts verify the presence of damp or wet materials, the Contractor shall be required to replace the
damaged areas at his own expense.
damaged areas at his own expense.
•• Repair or replace deteriorated or defective work found at time above inspection as required to a produce
Repair or replace deteriorated or defective work found at time above inspection as required to a produce
an installation which is free of damage and deterioration at time of Substantial Completion and according
an installation which is free of damage and deterioration at time of Substantial Completion and according
to warranty requirements.
to warranty requirements.