Safety
In general construction, at what height above a lower level does OSHA require fall protection, such as guardrails, safety nets, or personal fall arrest systems?
6ft
Name the three main types of single ply roof systems.
EPDM, TPO, PVC
Besides coping, name two other common types of edge metal used on flat roofs.
Gravel Stops, fascia, drip edge, gutter
The choice of seaming technology is heavily dependent on the type of single-ply membrane being used. Which seaming method is primarily used for TPO membranes, and which is more common for EPDM?
Heat welding (or Hot-air welding) for TPO, and adhesive or tape seaming for EPDM.
This type of roof is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane.
A green roof (or living roof).
This procedure is used to prevent accidental startup of machinery or equipment during maintenance or repair by placing locks and tags on energy isolating devices.
Lockout/Tagout (LOTO)
What are the three main ways single-ply membranes are attached to the roof deck?
Mechanically Attached, Fully Adhered, Ballasted
What are the three main parts of a typical gutter system designed to channel water away from a building?
Gutters, downspouts, and hangers.
What EPDM membrane thickness is typically required in order to obtain a 30yr warranty?
90mil
These devices are used to provide temporary support for planks or staging on sloped roofs, creating a stable work platform.
Roof jacks (or roof brackets).
What is the OSHA permissible exposure limit (PEL) in decibels when averaged for an 8-hour working day.
90 dBA
Name three common types of insulation used in single-ply roofing assemblies.
Polyisocyanurate (Polyiso), Expanded Polystyrene (EPS), Extruded Polystyrene (XPS)
In roofing, what does a lower gauge number for metal indicate, and how does it relate to the metal's strength and cost?
A lower gauge number indicates thicker metal, which is stronger and generally more expensive.
These types of products are used on EPDM and TPO membranes and stick to the membrane.
Pressure sensitive.
This type of roofing system involves spraying a liquid plastic that expands into a foam, creating a seamless, insulating layer directly on the roof deck.
Sprayed Polyurethane Foam (SPF) roofing (or PUF roofing).
What organization sets the standards for personal protective equipment (PPE) like safety glasses, hard hats, and high-vis vests used on construction sites?
ANSI
What is the typical R-Value per inch of polyisocyanurate insulation?
R-6
This ANSI/SPRI standard provides a basis for laboratory testing of roof perimeter metal edge flashings (excluding gutters) used with low-slope membrane roof systems to ensure wind resistance. What is it?
ES-1
This type of substance is often used to initiate or speed up a chemical reaction, such as the curing of certain adhesives or sealants such as liquid flashing.
Catalyst
Ladders are classified by duty ratings, which indicate the maximum weight capacity they can safely support. What is the highest duty rating for a heavy-duty industrial ladder?
Type IAA (375 lbs).
OSHA adopted this system for classifying and labeling hazardous chemicals to improve consistency and understanding worldwide.
Globally Harmonized System (GHS)
While the length and width of a cricket on a flat roof can vary, what is the commonly recommended ratio of length to width to ensure effective water diversion around obstructions?
3 to 1 (3:1)
FM 1-90 testing evaluates the wind uplift resistance of roof systems. What characteristic of the edge metal cleat is directly tested to determine its contribution to meeting this standard?
The gauge (thickness) of the cleat and its ability to resist pull-out or deformation.
What do the letters EPDM stand for in the name of a commonly used single-ply roofing membrane known for its durability and weather resistance?
Ethylene Propylene Diene Monomer.
Low-rise polyurethane foam adhesives consist of two parts that react when mixed. What are the specific names of these two components (not "Part A" and "Part B")?
Isocyanate (Part A) and Polyol (Part B).