| What is an Spray Polyurethane Foam Roof? |
SPF Roof Systems consists of 2 parts:
The base of the system is Polyurethane Spray Foam, a waterproof, monolithic, closed cell structure. Liquid components are mixed and sprayed onto a cleaned and prepared substrate. A rigid foam plastic forms within 10 seconds of being sprayed as the liquid expands to 30 times its original volume and chemically bonds to the surface on which it is sprayed. This forms a thick and seamless waterproof barrier that seals penetrations, voids, and junctions, and eliminates seams, joints, and the need for fasteners. Polyurethane Foam can be sprayed to any desired thickness to fill in low areas, build slope, and provide insulation. It can also be easily applied to roofs of any size, shape, or slope.
The top coat of the SPF system can be tailored to meet the specific needs of the customer. Acrylic, silicone, and polyurethane elastomeric top coats are the most common and can be used for chemical resistance, impact and abrasion resistance, flammability and code compliance, and to enhance the energy saving efficiency of the foam insulation. Ceramic granules can also be added to the top coat to enhance lifespan and increase durability of the roof.
| |
|
|
| What are the advantages of an SPF roof? |
One of the main advantages of SPF roofing is the cost
The polyurethane foam adheres directly onto a wide variety of existing substrates including built up roofing, concrete, asphalt shingles, modified bitumen, clay tile, and metal. This has 2 major money saving benefits. The new SPF roof can be put down without having to remove the old roof, so there is no cost for removal and disposal of the old roof. "Tear off" if needed is minimal. The 2nd benefit is that without having to remove the existing roof, our work is considered a repair and fully deductible.
Since 1975, Texas A&M University has exclusively used SPF roof systems to protect campus buildings from the elements. In addition to leak free protection the University has realized tremendous cost reduction through energy savings. The results of an in-house survey are listed below indicating a four and a half year payback, strictly through reduced utility bills.
| Year |
# of Bldgs |
Roof SqFt |
Construction Cost |
Annual Energy Savings |
Payback (discounted) |
| 1980 |
7 |
61,563
|
$164,214
|
$76,055
|
2 & 1/3 yrs
|
| 1981 |
4 |
75,670
|
$184,304
|
$16,532
|
7 & 1/2 yrs
|
| 1982 |
3 |
44,280
|
$126,400
|
$31,144
|
3 & 1/3 yrs
|
| 1983 |
8 |
163,516
|
$414,135
|
$74,048
|
4 & 1/2 yrs
|
| 1984 |
5 |
248,500
|
$805,346
|
$129,681
|
4 & 1/2 yrs
|
| Total |
27 |
593,529
|
$1,694,399
|
$327,460
|
4 & 1/2 yrs |
|
|
