Skip to main content

Vapor retarders



In this section, a ceiling assembly separates the attic space above from the room interior below. If the building is located in Lewisville, Texas (hot-humid zone), where is the predicted location of condensation and what is the predicted condition of the gypsum board in this assembly? (Select 2 from the following)

A. outside face of vapor retarder
B. inside face of vapor retarder
C. gypsum board will be wet
D. gypsum board will be dry



Answer: A. and C. As Lewisville is a hot-humid location, expect the room interior to be cooled by air-conditioning. Kraft paper facing acts as a vapor retarder with predictable condensation on the outside face, but this is faced on both sides - so the gyp. board will be wet. The vapor retarder should only be located outside of the insulation or between the insulation and the ventilated attic space.

Visit the PPD-PDD page for more study resources!

 Reference tip: read a paper about air vs vapor barriers here from conference session E11: Performance of the Building Enclosure of the 2008 Best 1 Conference BEST = Building Enclosure Science & Technology from National Institute of Building Sciences.

Comments

  1. Unknown3/17/13, 8:20 AM

    link is broken

    ReplyDelete
  2. Building Simply4/6/13, 11:24 AM

    Updated the links to the Building Enclosure paper & NIBS BEST Conferences...

    ReplyDelete

Post a Comment

Try These Too!

Stone shape and usage

Which of the following forms of stone is irregular with a minimum of one good face and is used for ashlar veneers, curbs, sills, and copings? A. Monumental stone B. Rubble stone C. Dimension stone D. Rough stone Answer B. Rubble stone. ARE 4.0 exam prep: BDCS
Post a Comment
See the answer »

Fire-alarm & detection systems

In an atrium connecting 2 or more stories, what device types are generally required per section 907.2.13 of the International Fire Code (IFC)? Answer Fire alarm activated by automatic alarm, fire flow or manual alarm. Further, in Group A, E or M occupancies, emergency voice / alarm communication system is required per 907.2.12.2 (High-rise buildings). ARE 4.0 exam prep: BS
Post a Comment
See the answer »

Model contract language

An owner-architect contract has stipulated an adjustment in compensation for reviewing re-submittals beyond a specified number. Where is this corresponding model language exist in order to coordinate with the contractor's responsibilities? 0.00.00 The Architect's review of Contractor's submittals will be limited to examination of an initial submittal and ____________ (_____) resubmittals. The Owner is entitled to obtain reimbursement from the Contractor for amounts paid to the Architect for evaluation of additional resubmittals. Answer It does not exist in the standard A201 general conditions of the contract for construction, and is recommended to be added to Section 3.12, as 3.12.11. ARE 4.0 exam study: CDS
Post a Comment
See the answer »