Insulation And Ventilation

Question 1

A vapor retarder installed where a vapor permeable water barrier should have been installed can trap moisture in the wall cavity. At best, the trapped moisture reduces the R-value insulation. At worst, the moisture condenses into liquid water, damaging the house and providing moisture for fungal growth

Answer 1

Review

Question 2

Vapor barrier, a technically questionable term often used when they term______ is intended

Answer 2

vapor retarder

Question 3

Class I vapor retarder is re-read it at______.

Class II vapor retarder is rated at between______.

Class III vapor retarder is rated at between ______.

Answer 3

0. 1 perms or less
1. 1 and 1.0 perms
2. 0 and 10.0 perms

Question 4

Air moving across or through insulation reduces it’s resistance to ______.

Answer 4

heat flow, it’s R value.

Question 5

_______occurs when he moves through solid matter. _______ occurs when he moves by circulation of a gas or liquid. ______ occurs when molecules gain here by observing electric and magnetic energy in the infrared part of the spectrum.

Answer 5

Conduction

Convection

Radiation

Question 6

Insulation must be in contact with an air barrier that is adjacent to condition space.

Answer 6

Review

Question 7

Insulation that is not in direct contact with the air barrier at the conditioned area is practically worthless.

Answer 7

Review

Question 8

Each house occupant can add ______ or more of water vapor to the air in the house each day.

Answer 8

half a gallon

Question 9

Are brick, wood and vinyl siding, #15 building felt, and insulation vapor permeable?

Answer 9

Yes

Question 10

Insulation sheathing _____ thick are moderately vapor permeable and are not considered vapor retarders.

Answer 10

1 inch or less

Question 11

A vapor retarder is not required, nor is it recommended, on either side of the walls in climate zones _______.

Answer 11

1-4

Question 12

A vapor retarder is not required in a adequately ventilated attic.

Answer 12

Review

Question 13

Batt, blanket, insulation comes in rolls that are usually installed between framing members. Some batts have a vapor retarder on one side and are called _____.

Answer 13

faced batts

Question 14

Fiberglass batts range between about o
R-3, standard, R-2, high density, per inch.

Wool and cotton batts are about ______.

Answer 14

R-3.7 per inch

Question 15

Ventilation by heat recovery systems, HRV, and energy recovery systems, ERV.

What is the main difference?

Answer 15

HRV’s transfer only heat between the incoming supply and outgoing exhaust air, while ERV’s transfer heat and some moisture.

Question 16

A mechanical air intake opening should be at least ______ a chimney or fuel burning up clients that.

Answer 16

10 feet horizontally or 3 feet below

Question 17

The clothes dryer duct should not exceed _______ developed length.

Add_____ for most 90° bend fittings.

Answer 17

35 feet

5 feet

Question 18

The default attic ventilation area requirement is ________ of attic floor area.

Answer 18

1 ft.² of net free area for every 150 ft.²

Question 19

The default crawlspace vent elation area requirement is _____ of crawlspace floor area.

Answer 19

1 ft.² of net free area for every 150 ft.²