Insulation: Part 2 Flashcards Preview

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Flashcards in Insulation: Part 2 Deck (18)
1

fibrous mat’l placed on/within kraft paper carrier.
typ mineral/glass fiber.

batt insulation

2

purpose of paper in batt insulation

holds in place, and vapor retarder.

3

batt insulation available w flame resistant surface, for

basement walls if left exposed.

4

plastic fiber insulation:

made from recycled PET milk bottles,
formed into batts similar to high-density fiberglass.

5

organic mat'ls used in board insulation:

wood, cane fiber, straw, perlite, cork.

6

most common type board insulation:

inorganic

7

board insulation:
advantages inorganic

higher insulating values

(2-3x @ same thickness as organic)

8

board insulation:
inorganic materials used

polystyrene, extruded expanded polystyrene,
polyisocyanurate, polyurethane.

9

board insulation:
inorganic materials blowing agent (in manufacturing)

originally CFC's (out '96),

now HCFC's (still depleting ozone),

replacements:
hydrocarbon HC,
carbon dioxide CO2.

10

closed-cell.
produced mixing unexpanded polystyrene beads containing liquid pentane,
and blowing agent.
heated to expand beads, injection molded into block.

beadboard

molded expanded polystyrene (MEPS)

11

molded expanded polystyrene (MEPS):
most common density

1lb/ft3

12

molded expanded polystyrene (MEPS):
problem w spaces between beads

can absorb water, so vapor retarder req'd in moisture migration is concern.

13

closed cell.
mixing polystyrene pellets w various chemicals,
and blowing agent.
forced thru extruder, atmospheric pressure causes expansion.

extruded expanded polystyrene (XEPS):

14

extruded expanded polystyrene (XEPS)

compared w

MEP

> insulation value per thickness
and
> compressive strength than.
> $
>superior resistance to water absorption

15

extruded expanded polystyrene (XEPS)
use:

residential sheathing and wall/foundation/roof insulation.

16

only insulation for membrane roof systems/below grade insulation.

extruded expanded polystyrene (XEPS)

17

close cell foam w low-conductivity gas in the cells.

polyisocyanurate: aka “polyiso”

18

closed cell,
density 2lb/ft3,
no HCFCs,
r-value 6.5–7
most $.

polyurethane