Roofing field answers

A built-up roof, or BUR, is a low-slope membrane built on the deck from alternating plies of reinforcing felt and layers of bitumen, then topped with a surfacing such as gravel, a cap sheet, or a coating. It is the original tar and gravel roof, typically 3 to 4 plies for redundancy.

A construction safety program is the written plan and daily practices a contractor uses to prevent injuries and meet OSHA: the safety manual, a competent person, training, toolbox talks, job hazard analyses, inspections, incident response, and records. The written part is small. The habits on site and the documentation are what make it real.

Because the work quality is assumed and the communication is what the customer can actually judge. They cannot see your roof, but they feel whether you called back, showed up on time, and explained the bill. That experience is what earns the review, the referral, and the repeat job, not the workmanship alone.

An EPDM roof is a single-ply membrane made of cured synthetic rubber, ethylene propylene diene monomer, used on low-slope commercial buildings. Usually black, it is installed fully adhered, mechanically attached, or ballasted, and its seams are bonded with splice tape and primer rather than welded. It carries the longest field track record of the single-ply membranes.

Size a gutter to the roof area draining into it and the local design rainfall intensity. Find the runoff flow from area times rainfall, then pick the smallest profile and size that carries it off the SMACNA or plumbing-code chart. The adopted code, SMACNA, and the project spec control the basis.

Ice dams are caused by heat escaping the house and warming the roof deck, which melts the underside of the snow. The meltwater runs down to the cold eave or overhang past the heated wall and refreezes into a ridge of ice. That dam backs water up under the shingles and into the building.

A job hazard analysis, or JHA, breaks a task into its steps, identifies the hazard at each step, and assigns a control for each one using the hierarchy of controls. OSHA Publication 3071 describes the method. Build it with the crew who do the work, and redo it when the task or conditions change.

Standing seam hides its fasteners under concealed clips, so nothing pierces the weather surface, and the panel floats with temperature. Exposed-fastener panels are screwed through their face with a gasketed washer at every hole. Those washers and holes wear out and leak, which is why standing seam lasts far longer and costs more.

Modified bitumen, or mod-bit, is an asphalt-based sheet roofing membrane reinforced with a polyester or fiberglass mat and modified with SBS rubber or APP plastic. It is the roll-applied successor to built-up roofing, installed in multiple plies on low-slope roofs for redundancy and foot-traffic durability.

The 4 to 1 rule sets a leaning extension ladder so the base sits out 1 foot for every 4 feet of working height, about a 75 degree angle. A ladder reaching 16 feet up has its feet roughly 4 feet out. The arm test confirms it; verify the angle against OSHA and the AHJ.