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Flashcards in Thermal and Moisture Protection Deck (8)
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1
Q

Layers of a green roof

A
  1. Plants
  2. Engineered soil or growing medium
  3. Filter fabric
  4. Retention layer
  5. Drainage layer
  6. Sheet barrier
  7. Waterproof membrane
2
Q

3 Types of Green Roofs

A
  1. Intensive: 1’ soil depth for shrubs, trees, etc.; require irrigation and drainage systems; heaviest; requires concrete deck.
  2. Extensive: 4-6” soil depth; low maintenance small, hardy plants; medium weight; installed over any properly designed roof.
  3. Modular: Trays with 3-4” of engineered soil and low growing plants; installed over pads; lightest weight.
3
Q

Layers of flat roof assemblies

A
  1. Wear course (aggregate or pavers)
  2. Drainage layer
  3. Roofing membrane (built up or single ply; sloped 1/4” per foot min)
  4. Thermal insulation (3 options for placement)
  5. Vapor retarder (on warm side)
  6. Roof deck
4
Q

Three positions of thermal insulation in flat roof assembly

A
  1. Below the roof deck
  2. Between roof deck and roofing membrane
  3. Over the roofing membrane
5
Q

Built-Up Roofing System

A
  1. Wear course of gravel

2. Alternating layers of asphalt or tar and reinforced felt

6
Q

Single Ply Roofing System

A

Types: TPO, PVC, Modified Bitumen, EPDM. Applied in liquid or sheet form. No slope limitation. Thin, flexible and strong.

7
Q

Roof drainage rules of thumb

A

Slope roof min 1/4” per foot. Slope gutters min. 1/16” per foot. Minimum 2 roof drains per 10,000 SF roof area + 1 per 10,000 after that. Downspouts: 1 square inch per 100 SF of roof area.

8
Q

Vapor retarder

A

Material of low permeance installed in a building to prevent moisture from entering and reaching a temperature where it can condense into a liquid. Install on warm side in cold and temperate climates. Install on outer face of construction in warm climates. Sometimes inherent or included in rigid foam insulation boards.