Made up of interacting roof components, a roof system is designed to weatherproof and insulate the top surface of a building. B. L. Dalsin specializes in several roofing systems. Our project managers will help you make an informed decision resulting in a timely roof completion of the highest quality and best value.

BUR– Multi Ply Asphalt Roof Systems
EPDM– Single Ply Rubber Membrane Roof Systems
PVC/ TPO– Single Ply Heat Weld Roof Systems
Green Roof Systems– Eco Friendly that decrease the urban “heat island” effect
Modified Bitumen – Polymer-Modified Bitumen Systems
Architectural Sheet Metal – Mansard Roofs & Roof Panel Systems
Above Grade Waterproofing – Plaza Decks, Parking Ramps, and Balconies
Roof Top Patios – Expand your living space by adding pavers or a patio to your roof
Roof Coatings – Seamless waterproofing membrane for superior weatherproofing


A built up roof membrane, sometimes referred to as BUR, consists of multiple layers of saturated felts, coated felts, or mats assembled in place shingle fashion with alternate layers of bitumen and surfaced typically with mineral aggregate. Typically applied in 3 ply or 4 ply configurations, asphalt and gravel built up roofs have been in use since the 1870’s with great success.


Thermoset single-ply membranes, such as ethylene propylene diene monomer (EPDM), are synthetic rubber materials that are cured or vulcanized during the manufacturing process. Thermoset polymers can only be bonded to like material with glue or adhesive seam tape. EPDM sheets used for roofing became widely available here in the early 1980’s. They are usually black in color and range in thickness from 45 mils to 120 mils. The most common thicknesses of EPDM single-ply roof membrane materials are 45 mils and 60 mils. EPDM installations may be ballasted, mechanically attached or adhered to approved substrates.



Thermoplastic single-ply membranes, such as polyvinyl chloride (PVC) typically have no chemical cross-linking in the molecular composition. Because of this, thermoplastic roofing sheets are typically seamed together by heat-welding with hot air. PVC polymers were originally produced in Germany in the 1950’s. The sheets are usually white but can be formulated in a range of colors. Typical thicknesses are 36 mils, 45 mils, 60 mils, 72 mils, and 90 mils. PVC installations may be ballasted, mechanically attached or adhered to approved substrates.

Thermoplastic polyolefin (TPO) membranes are compounded from a blend of polypropylene and ethylene-propylene rubber polymers. TPO membranes from various manufacturers vary in look, feel, and physical properties. TPO membranes are typically reinforced with polyester scrim or fabric that is positioned during manufacturing near the middle of the finished thickness of the TPO membrane. Seams are hot air welded. The sheets are produced as white sheets though other colors are available. Thicknesses include 45 mils, 60 mils, 72 mils, 80 mils and 90 mils. TPO installations may be ballasted, mechanically fastened or adhered to approved substrates.

Green Roof Systems

( Vegetative Roof Systems )

Also known as Green Roofs, vegetative roof systems are gaining popularity especially in larger urban areas where there is growing concern to combat the heat island effect generated by high concentrations of concrete sidewalks, streets and tall, reflective buildings clustered tightly together. An additional benefit is the ability to help control ground water run-off by retaining rain water for plant use. These systems rely on a premium waterproofing system and associated components such as a protection course, a root barrier, a drainage layer, thermal insulation and an aeration layer, and an overburden of growth medium and plantings. Extensive systems refer to growth medium (engineered soil) depths up to 6” while intensive systems have growth medium depths greater than 6”. Owners can also choose extensive systems that utilize pre-planted trays installed in a modular application.

Modified Bitumen

( Polymer-Modified Bitumen Systems )

Polymer-modified roof membranes, better known as Modified Bitumen Systems, are composed of reinforcing fabrics, usually polyester, fiberglass or both, that serve as carriers for the polymer-modified bitumen as it is manufactured into a roll material. They were developed in Europe in the 1960’s and have been used in North America since about 1975.

We Have the Experience You Need

Do you have a roofing project? Don’t hesitate to call us or message us directly.