|
|
SPF
|
BUILT-UP
|
SINGLE-PLY
|
|
Weather Protection
|
- Water cannot
migrate though closed cell foam less ponding
- High wind
uplift
- No deck
penetration
|
- Joints and
seams allows water migration
- Leaks hard to
locate
- Loose aggregate
can become projectiles
|
- Ponding
frequent
- Leaks hard to
locate
- Several deck
penetrations
|
|
Energy and Comfort
|
- Lower heating
and cooling costs
- No thermal
bridging
- Highest R value
insulation
- Lower roof
temperatures, reducing thermal stress
- Reflects solar
radiation
- Improved occupant
comfort
|
- Temperature
build-up on roof
- Indoor
environment more difficult to condition
|
- Temperature
build-up on roof
- Indoor
environment more difficult to condition
|
|
Installation
|
- Usually no
costly tear-off
- Conforms to irregular
shapes, can be custom sloped
- Fully adheres
to almost any substrate
- No fasteners,
no welding, no glue
- Lower labor
cost
|
- Major
construction
- Tear-off and
waste disposal required
- Irregular
shapes difficult
- Joints
unreliable
- Expensive labor
|
- Irregular
shapes difficult
- Fasteners
expensive
- Potential
leakage points
|
|
Maintenance & Repair
|
- Minor
maintenance
- Renewable with
simple recoats
- Simplified
flashing and details
|
- Major
reconstruction needed
- Costly and
frequent
|
- Non-renewable
- Must be torn off
at end of life cycle
|