EXAC Exam 3 with Complete Solutions
Forms of Water Penetration - ✔✔1. Kinetic energy of rain
2. Gravity flow
3. Surface tension
4. Capillary action
5. Pressure differential
Exterior Wall Systems - ✔✔1. Mass Wall (concrete, masonry): Sheds most, absorbs and dry
remaining
2. Barrier Wall (EIFS): Relies on continuous seal, maintenance
3. Drainage Wall (Stucco, siding): Drainage plane w/ moisture barrier.
4. Rainscreen: Air cavity as drainage plane on rigid water resistant airtight wall.
PERS Wall - ✔✔Pressure equalization rainscreen system.
- Uses vented cladding and air cavity
- Divided into compartments
Control Layers (4) (WAVT) - ✔✔1 - Water
2 - Air
3 - Vapour
4 - Thermal
Air Barrier - ✔✔1. Impermeable to air flow
2. Continuous over entire building enclosure
,3. Able to withstand forces
4. Durable during lifetime
5. System rather then one component.
Interior Air Barrier - ✔✔Gypsum Board: To be sealed at all locations including bottom and
top of stud, where it abuts a interior stud, around windows and doors, top plate of partition
wall where adjacent to a unconditioned space.
Poly: Seal at all locations as per above
Exterior Air Barrier - ✔✔Air / Vapour barrier on exterior sheathing or gypsum board.
Water Barrier - ✔✔1. Resists bulk of water from entering wall assembly from exterior
2. Behind exterior cladding
3. Channels water down drainage plane
Moisture Vapour Control - ✔✔Vapour Barrier (0.1 perm or less)
- Class 1 vapour retarder
- Vapour diffuses from high humidity to low (hot to cold)
- use vapour barrier or vent
Ice Damming prevention - ✔✔1. Seal ceiling from b/w interior and attic
2. Vent attic
3. Proper eave flashing (24" - 36" from inside of wall)
Insulation Material - ✔✔1. Batt or Blanket - 3.3
2. Rigid Board - 4 - 7
, 3. Foam in place - 6
4. Loose fill - 3
5. Cast - 1.5
Batt insulations - ✔✔1. Fiberglass R3.3
2. Mineral wool R3.3
- Sound insulation
- Non combustible
- Fire resistant
Rigid Foam - ✔✔1. Cellular Glass R2.5 (Fire resistant, impervious to moisture, dimensionally
stable)
2. Foam plastics (flammable)
a) Polystyrene, molded: R3.6
b) Polystyrene, extruded: R5.0 (closed cell, impervious to moisture)
c) Polyurethane, expanded: R6.2
d) Polyiso: R7.2
e) Perlite: R2.6
Foam in Place - ✔✔Polyurethane R6.2
- Closed cell used as a vapour barrier,
- flammable
Loose Fill - ✔✔1. Cellulose R3.7
2. Perlite R2.7
Forms of Water Penetration - ✔✔1. Kinetic energy of rain
2. Gravity flow
3. Surface tension
4. Capillary action
5. Pressure differential
Exterior Wall Systems - ✔✔1. Mass Wall (concrete, masonry): Sheds most, absorbs and dry
remaining
2. Barrier Wall (EIFS): Relies on continuous seal, maintenance
3. Drainage Wall (Stucco, siding): Drainage plane w/ moisture barrier.
4. Rainscreen: Air cavity as drainage plane on rigid water resistant airtight wall.
PERS Wall - ✔✔Pressure equalization rainscreen system.
- Uses vented cladding and air cavity
- Divided into compartments
Control Layers (4) (WAVT) - ✔✔1 - Water
2 - Air
3 - Vapour
4 - Thermal
Air Barrier - ✔✔1. Impermeable to air flow
2. Continuous over entire building enclosure
,3. Able to withstand forces
4. Durable during lifetime
5. System rather then one component.
Interior Air Barrier - ✔✔Gypsum Board: To be sealed at all locations including bottom and
top of stud, where it abuts a interior stud, around windows and doors, top plate of partition
wall where adjacent to a unconditioned space.
Poly: Seal at all locations as per above
Exterior Air Barrier - ✔✔Air / Vapour barrier on exterior sheathing or gypsum board.
Water Barrier - ✔✔1. Resists bulk of water from entering wall assembly from exterior
2. Behind exterior cladding
3. Channels water down drainage plane
Moisture Vapour Control - ✔✔Vapour Barrier (0.1 perm or less)
- Class 1 vapour retarder
- Vapour diffuses from high humidity to low (hot to cold)
- use vapour barrier or vent
Ice Damming prevention - ✔✔1. Seal ceiling from b/w interior and attic
2. Vent attic
3. Proper eave flashing (24" - 36" from inside of wall)
Insulation Material - ✔✔1. Batt or Blanket - 3.3
2. Rigid Board - 4 - 7
, 3. Foam in place - 6
4. Loose fill - 3
5. Cast - 1.5
Batt insulations - ✔✔1. Fiberglass R3.3
2. Mineral wool R3.3
- Sound insulation
- Non combustible
- Fire resistant
Rigid Foam - ✔✔1. Cellular Glass R2.5 (Fire resistant, impervious to moisture, dimensionally
stable)
2. Foam plastics (flammable)
a) Polystyrene, molded: R3.6
b) Polystyrene, extruded: R5.0 (closed cell, impervious to moisture)
c) Polyurethane, expanded: R6.2
d) Polyiso: R7.2
e) Perlite: R2.6
Foam in Place - ✔✔Polyurethane R6.2
- Closed cell used as a vapour barrier,
- flammable
Loose Fill - ✔✔1. Cellulose R3.7
2. Perlite R2.7
