Over the last
ten years we have been recycling most all scrap metal from our jobs
and keeping it out of landfills. Now, the sustainability movement along
with the advent of landfill restrictions on construction waste and
the increase in waste disposal fees has begun to create the conditions
to make recycling most all roofing material a reality. We too, are
expanding our efforts in recycling even more of the construction
debris from all our roofing jobs; including gravel from built up
roofs, wooden pallets left over at job sites, plastics, roofing
membranes and roofing shingles. We are committed to helping
building owners and property managers meet their
sustainability goals today, and long into the future.
A cool roof reflects and emits the sun’s energy as light back to the
sky instead of allowing it to enter the building below as heat.
In many climate zones, a cool roof can substantially reduce
the cooling load of the building, providing several direct benefits to
the building owner and occupants:
- increased occupant comfort, especially during hot summer months
- reduced air conditioning use, resulting in energy savings typically of 10-30%
- decreased roof maintenance costs due to longer roof life
- reduced peak demand for electricity, helping to lower costs and avoid power outages
A cool roof need not be white. There are many “cool
color” products which use darker-colored pigments that are highly
reflective. With “cool color” technologies there are roofs that come in a
wide variety of colors and still maintain a high solar reflectance.
- Built-up Roofing (includes asphalt and coal tar pitch):
Built-up Roofing (BUR) consists of built-up layers of asphalt
and plies that can be covered with a capsheet (or
surfacing material). The “cool” products found in
this category refer to the properties of the capsheet.
- Metal: Metal roofs come in a variety of textures and colors, including
some darker “cool” colors with special additives that allow these dark
colors to achieve significantly greater reflectance than previous
versions of the same product.
- Modified Bitumen:
Modified bitumen is bitumen (asphalt or tar) modified with plastic and
layered with reinforcing materials then topped with a surfacing
material. Like BURs, the radiative properties of modified bitumen (mod
bit for short) are determined by the surfacing material.
- Roof Coatings:
Roof coatings can be divided into two categories: field-applied and
factory-applied. Field-applied coatings are applied directly onto the
roof surface, either on a new roof assembly or over an existing roof
surface (and can be applied over top of just about anything, so long as
the right coating is selected). Factory-applied coatings are applied at
the factory prior to distribution.
- Single-Ply: Single-ply
roofing is a pre-fabricated sheet of rubber polymers that is laid down in a single layer over a low or steep-sloped roof.
The single-ply membrane can be loose-laid and weighted down with ballast
or pavers or firmly set on the roof and attached with mechanical
fasteners or adhesives.
The two basic characteristics that determine
the ‘coolness’ of a roof are solar reflectance (SR) and thermal
emittance (TE). Both properties are rated on a scale from 0 to 1, where 1
is the most reflective or emissive.
The CRRC measures these two properties for
roofing products, both for the product’s initial values and after three
years of weather exposure and can be found in their rated products directory.