LOW SLOPE & FLAT ROOFING IN ANCHORAGE
We are highly skilled in all low slope roofing applications, including single-ply membranes such as EPDM (rubber), PVC, and TPO, and torch applied APP membranes. There is not a one size fits all approach when selecting a membrane for a flat or low sloped roof. We will guide you in selecting the best roofing system for your property.
Single-ply membranes are typically categorized as either thermoplastic or thermoset. Thermoplastic materials can be repeatedly softened when heated and hardened when cooled. Thermoset materials solidify, or "set", irreversibly after heating. Single-ply membranes are commonly referred to by their chemical acronyms, such as ethylene propylene diene terpolymer (EPDM), poly vinyl carbonate (PVC), and thermoplastic olefin (TPO).
Single-ply membranes may contain reinforcement layers. Common reinforcements for single-ply membranes include polyester fabrics or scrims, glass fiber, or a felt or fleece backing. A finished sheet's thickness typically is referred to as mil thickness; 1 mil equals 0.001 inch. Common mil thicknesses for these sheet membranes range from 30 mils to 60 mils.
Single-ply membranes can be installed fully adhered, mechanically attached or held down with ballast. Most single-ply roof systems do not receive surfacing.
Many times, a combination of attachment methods are used to secure a roof system. For instance, an insulation may be mechanically attached to the substrate with the roof membrane fully adhered to the insulation.
Modified Bitumen Roofing
This type of low slope roofing material is referred to as modified bitumen due to its material makeup which consists of modifiers that are added to standard roofing asphalt to replace plasticizers removed during the distillation process. Bitumen is reinforced with fiberglass or polyester fiber matting in order to increase durability and strength.
The APP (attactic polypropylene) modified bitumen roof system is installed using the torch applied method. The APP modified bitumen is used for its ability to increase the aging ability of the roof system. The APP system can be reinforced with either glass or polyester. There are a variety of advantages with this type of system, such as the rolls of material being factory manufactured which ensures quality control. This system is also well suited to expand or contract with the movement of the building they protect.
A modified bitumen roof system is versatile and can be finished with a variety of surfaces that enhance their resistance to oxidation and damage from UV rays.
taper Systems ON flat ROOFS
Positive drainage is necessary to ensure a safe, long lasting roof. Ponding water and freeze-thaw cycles can result in costly repairs and even premature roof failure, which is rarely covered under warranty or by insurance. Positive sloped roof systems result in reduced maintenance and less stress to the building structure. We will evaluate the need for a taper system, and inform the property owner of our recommendations.