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ROOFING COMPANY SERVICES
ROOF REPLACE
WATER PROOFING
ROOF
INSULATION
MODIFIED BITUMEN MEMBRANES
Modified bitumen membranes are commonly employed for roof waterproofing in a two-ply system. The layers of rolled sheets can be bonded either with hot asphalt or by fusing the surfaces together using a torch. Cold application methods include using cold adhesive or self-adhesive (peel-and-stick) options.
The most widely used design for modified bitumen involves a fully exposed membrane, although it can also be applied in inverted designs or protected systems. Modified bitumen is created using either Atactic Polypropylene (APP) or Styrene Butadiene Styrene (SBS) modifiers blended with asphalt. SBS membranes are known for their superior low-temperature flexibility and are particularly popular in Canada. These membranes are produced in rolled, reinforced sheets, typically around 1 meter wide, with thicknesses of 2.2, 2.5, 3, and 4 millimeters.
The reinforcement in modified bitumen sheets is either fiberglass or non-woven polyester. The weight of the reinforcement is indicated by manufacturers’ designations, such as 90, 100, 180, and 250, which refer to grams per square meter.
The underside of modified bitumen sheets is often sanded, whereas torch-grade sheets feature a thermo-fusible plastic film on their surface. Generally, installation involves two layers: a base sheet lacking granule protection on the top and a cap sheet, which does have granule protection
PRIMARY ADVANTAGES of modified bitumen membranes are
1. Excellent flexibility
2. High strength
3. High puncture resistance
4. Year-round application (cold process applications are restricted to +5 degree C)
5. Variety of colors
6. Lightweight
7. Excellent weathering
EPDM
Ethylene-Propylene-Diene-Monomer (EPDM) is a single ply sheet membrane used for roof waterproofing by reliable roofing companies in Ottawa. It can be used in a variety of system designs, and can be fully
adhered, inverted and loosely laid and ballasted. The sheet in its final form is a
combination of the rubber polymer(EPDM) and other components including carbon
black. The sheet is typically manufactured non-reinforced, in a thickness of 45 mils, 60
mils and is now available in 90 mils. Some manufacturers produce a polyester
reinforced sheet for use in a mechanically fastened system. Flashings for detail work are
formed with semi-cured EPDM, which can be molded to fit the contours of corners and
other flashing shapes. Bonding of EPDM rubber is accomplished by roofing contractors in Ottawa with the use of adhesive and seaming tap.
TPO
THERMOPLASTIC POLYOLEFIN TPO is a thermoplastic* single-ply membrane
used for roof waterproofing in a variety of system designs. It can be adhered mechanically fastened or loosely laid and ballasted. TPO is manufactured in sheets that
are reinforced with a polyester mat. Widths, 8, 10'AND 12' Standard length
100'roll. Thickness-(mils) 45, 60, 72, and 80.
Colors- White, Gray, and Tan.
Manufactured to ASTM D 6878, Specification for Thermoplastic Polyolefin Based Sheet Roofing Plastics.
TPO Accessories
Detail work is commonly done with a non-reinforced product
Preformed Accessories are available in non-reinforced products and now are also
available in reinforced products
INSULATION
Insulation performs two functions in a roofing assembly. The obvious use is its role in
reducing the heating and cooling loads on the structure. The second and certainly every
bit as important use is its function as a substrate to support the roofing membrane. In an
inverted membrane assembly, the insulation is a substrate for the ballast and a protection
layer for the membrane. There are numerous roofing insulation products on the market
and as with all material products, the various insulations have their advantages and
disadvantages.
The insulating value of a material is measured in terms of its"R" or"RSI" value R
being a value in imperial measurement and RSI being its metric equivalent. RSI or R
-value is a measure of a materials ability to restrict the transmission of heat and is stated
relative to the thickness of the material
The second property of insulation, its role as a substrate, is much harder to quantify
This property has many components and unfortunately for some insulation
manufacturers, the true ability of their product to perform in the role only becomes evident after several years of service. Insulation must be mechanically stable to prevent
curling and shrinking and must be strong enough to support traffic loads
insulation Properties
The properties that insulation should possess, especially if it is to be used in an exposed
membrane, warm deck roofing system are:
-
High resistance to heat flow -to reduce heat losses from the building(high"R use)
-
Dimensional stability -to minimize volumetric change due to variations in temperature and moisture content. Lightweight- to minimize dead loads(loads due to the weight of structure). Shear strength -to resist deformation.
-
Impact resistance -to provide a stiff support for the membrane and resistance against indentation or puncturing
-
Durability- especially with regard to moisture(wetting and drying) and thermal cycling
-
Fire resistance-to meet Building Code requirements
-
Chemical stability -to minimize future problems with curing
-
Compatibility with other materials used in the roofing assembly
-
Surface smoothness- to provide a satisfactory surface for application of the membrane.
-
Compressive strength- to resist traffic.
-
Insulation performs two functions in a roofing assembly. The obvious use is its role in
-
reducing the heating and cooling loads on the structure. The second and certainly every
-
bit as important use is its function as a substrate to support the roofing membrane. In an
-
inverted membrane assembly, the insulation is a substrate for the ballast and a protection
-
layer for the membrane. There are numerous roofing insulation products on the market
-
and as with all material products, the various insulations have their advantages and
-
disadvantages.
-
-
The insulating value of a material is measured in terms of its"R" or"RSI" value R
-
being a value in imperial measurement and RSI being its metric equivalent. RSI or R
-
-value is a measure of a materials ability to restrict the transmission of heat and is stated
-
relative to the thickness of the material
-
-
The second property of insulation, its role as a substrate, is much harder to quantify
-
This property has many components and unfortunately for some insulation
-
manufacturers, the true ability of their product to perform in the role only becomes evident after several years of service. Insulation must be mechanically stable to prevent
-
curling and shrinking and must be strong enough to support traffic loads
-
insulation Properties
-
-
The properties that insulation should possess, especially if it is to be used in an exposed
-
membrane, warm deck roofing system are:
-
-
-
High resistance to heat flow -to reduce heat losses from the building(high"R use)
-
Dimensional stability -to minimize volumetric change due to variations in temperature and moisture content. Lightweight- to minimize dead loads(loads due to the weight of structure). Shear strength -to resist deformation.
-
Impact resistance -to provide a stiff support for the membrane and resistance against indentation or puncturing
-
Durability- especially with regard to moisture(wetting and drying) and thermal cycling
-
Fire resistance-to meet Building Code requirements
-
Chemical stability -to minimize future problems with curing
-
Compatibility with other materials used in the roofing assembly
-
Surface smoothness- to provide a satisfactory surface for application of the membrane.
-
Compressive strength- to resist traffic.
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